As rattlesnakes start to show up on the surface again this year, a few things are predictable. Some hikers and homeowners will report rattlesnake sightings, complete with photos of usually-sleeping snakes, with various warnings and declarations about warm winters and misreads on words like ‘brumation’.
So we’ll state plainly and to the point: rattlesnakes are not coming out early; it is typical every year for rattlesnakes to begin the early staging portion of den egress in mid-February.
This is based on our relocation data from more than 14 years of operation, as well as field observations from our team over the past 20 years. It’s also just keeping track of when these sightings tend to start each year, which is easier than ever thanks to social media. We can state with complete accuracy that the rattlesnake emergence activity right now (February 2024) is typical and going as planned.
In the next two weeks, sightings will increase, but rattlesnakes will not be out and about just yet. This “staging” part involves a lot of laying around in the sun near the entrance to their den. That might be sleeping in the grass right next to it, lounging under a nearby bush, or coiled on top of a packrat nest. They may make short movements, but are still tethered to the den until springtime conditions stabilize in March.
A Western Diamondback Rattlesnake doing its thing, as they do every February. This snake will hang out, along with a few others, right around the entrance to its winter den for a few weeks before leaving for the Spring. Most people would never see this without intentionally seeking it, so don’t worry.
How to avoid rattlesnakes in the staging period of den egress
Hikers can avoid rattlesnakes right now by simply staying on the trails. If you notice, most of the posts from hikers on social media where a rattlesnake is spotted are off-trail, climbing boulder piles or other situations where seeing a rattlesnake might even be expected. In comparison, a trail with people coming and going is not a place that most rattlesnakes will want to deal with for these sensitive situations, and will avoid them. Put your dog on a leash if it isn’t already, and it’s time to put the headphones away for the year.
Homeowners who see rattlesnakes in February should know that they’ve likely been there for months at this point, and it’s possible there are others on the property. If you’re doing any work like a garage cleanout, using a grill island, anything involving the pool equipment area, or general yard cleanup, be aware that this is when rattlesnakes might show themselves. And if you do see one, AVOID the fire department’s version of “rattlesnake relocation”, which is to dump it on the other side of the fence … which this time of year would guarantee an immediate return to the place of capture or a neighbor’s property.
Rattlesnakes may be visible, but prime rattlesnake encounter time is still a month or more away
Think of what they’re doing right now like this. It’s that part of the morning where you’re getting up and pouring some coffee. Maybe you’re checking some email or texts from overnight, but you’re not getting into all that right now. You’ve got that 45 minutes or so to let your brain adjust to daytime, and those sweat pants aren’t going anywhere for now. Think of rattlesnake activity in February like this, and for many of us, it will make perfect sense.
You can keep an eye on how the overall rattlesnake season is progressing by looking at our Rattlesnake Activity Forecast: based on real-time snake relocation information coming into our hotline. As you can see for today, it’s not something to really concern yourself with.
Some easy responses to common comments about rattlesnakes in February:
“OMG they’re out early!”
No, this is very normal. Every year, rattlesnakes start the den egress process in favorable conditions starting as early as January.
“I’m done hiking for the year!”
That’s unfortunate! While the fear of rattlesnakes may be real, the danger is relatively easy to mitigate. If hiking is something you enjoy, working on learning to feel ok out there to keep hiking the other 9 months of the year may be worthwhile.
“They never go away for the winter”
Sure they do. Being on the surface at the den is part of the larger, complex behavior of hibernation. While it’s true that in some conditions rattlesnakes can be seen in specific locations at any time of year, this behavior is largely predictable and to compare behavior over the winter months to, say, April, is simply inaccurate.
Each day in July, 2023 has been above 110˚F with no end in sight. What do the rattlesnakes do?
A common misconception is that reptiles love the sun – the hotter, the better, right? Well, not quite. Like all reptiles, rattlesnakes are ectotherms and get their heat from the environment. But that doesn’t mean they don’t have limits. Just like you in the office when whats-his-name down the row keeps fiddling with the thermostat, rattlesnakes prefer specific temperatures. And more importantly, they can quickly die when they get too hot.
How hot is too hot for a rattlesnake? It depends. Generally, if the body temperature gets above 110˚ for even a little while, a rattlesnake will not survive. With ground temperatures hot enough to cook an egg, a rattlesnake caught out in the open for even a minute mid-day in Arizona will not survive. Aside from overheating, prolonged heat can kill off rattlesnakes by desiccation, literally drying out in the Arizona oven while the monsoon takes its sweet time getting here.
Where do rattlesnakes go when so hot?
Rattlesnakes hide away during the hottest and driest time of year in carefully selected retreats in a behavioral state known as aestivation. Think of it as hibernation to escape the heat instead of cold. Each year, rattlesnakes may use the same aestivation den, alongside other rattlesnakes of multiple species. And just like hibernation, these aestivation dens serve as social hubs, as well as survival escapes.
In the wild, these aestivation dens may be a cave in a drainage wall, a deep crevice in a rocky outcrop, packrat nests, or any number of other deep, thermally protected areas. But near developed areas, an even greater resource exists: backyards.
Openings to the foundation, cracks in the concrete leading under the deck, the shaded base pad under pool pump equipment, and more can be ideal aestivation dens for groups of rattlesnakes. Even better, almost all backyards provide easy sources of water. Combine all of this with dense, well-watered lantana or rosemary, and the perfect rattlesnake summer sanctuary is made.
If you find a rattlesnake in the yard right now, it’s possible it has been there awhile.
These Speckled Rattlesnakes are resting a short distance from their aestivation den and will retreat once the sun heats the area. This is a similar situation to aestivation dens found at homes, where homeowners may encounter them on the patio a short distance from the actual den.
“But it’s a dry heat”
Don’t be fooled by this favorite statement of visitors from wetter climates. We’re not talking about feeling sweaty and uncomfortable while you eat BBQ – dry heat kills.
Moisture loss is a significant danger to rattlesnakes when it’s so hot and dry outside. Simply breathing is dangerous, as every molecule of water lost from the body won’t be replaced until it falls from the sky. Any source of sustained water can and will attract rattlesnakes and other wildlife. If there is deep cover nearby to wait out the day until the next opportunity to drink, it makes an irresistible resource.
A group of rattlesnakes I found living under a leaky AC unit behind our home.
For homeowners, now is the time to review the property. Something as simple as a dripping hose or irrigation line that’s a bit too generous may be an oasis bringing venomous snakes to the yard. Eliminate any sources of water possible. View the property as critical habitat, and make careful decisions. If a rattlesnake is spotted few times a year near that over-watered natal plum, it’s time for some hard decisions about that plant.
What happens to rattlesnakes that are relocated when it’s so hot?
This statement doesn’t exactly make us popular, but it’s the truth. Do not call the fire department or the local security guard to relocate snakes, especially when it’s this hot. Even if the fact the snake will likely die isn’t reason enough, a potentially more dangerous situation can be the result. It doesn’t matter who: call a professional with deep snake knowledge. Here is why:
Homeowners are finding rattlesnakes in entryways or in a corner along the back patio and calling for relocation. The trick is, however, that these situations are usually not new. If a rattlesnake is in a yard right now, there are two scenarios that are most likely:
The rattlesnake has been aestivating on the property or immediately adjacent and is being discovered by chance after weeks of undetected behavior.
The rattlesnake was displaced by construction. Or, with increased frequency, botched relocation by the fire department or under-experienced relocator.
Rattlesnakes are often found in small groups aestivating in backyards. When we are called to catch one, we can usually locate the aestivation den, where we look to see if there are more. The homeowner is then educated on what is happening, and how the den can be addressed to prevent future, similar encounters. In these instances, the snake itself is not the issue, but a symptom of a provided resource. Usually, these can be fixed relatively easily.
Rattlesnake encounters in the summer that are due to construction of unexperienced relocation are a more complicated matter, unfortunately. While it is a great thing that there is an increased will out there to not kill rattlesnakes and have them relocated instead, the details matter greatly. If a rattlesnake is captured by the fire department and moved to a nearby bush or released to open ground, one of two things happen: the snake dies, or it panics and manages to escape to the nearest cover. This can be shade at the neighbors’ house, back to the original location, or any number of potentially dangerous situations. Rattlesnakes that are able to behave naturally can often coexist for a lifetime without conflict with humans by careful evasion, but all bets are off when they are forced into a cover-or-die situation.
We are currently seeing a lot of activity on our snake removal hotline. Rattlesnakes and other wildlife are having a tough time in this heat, forcing them to take desperate measures to survive. This increase of conflict is something that can be resolved by working with the natural behavior of the snake. This means that snakes that are captured for relocation must be released directly into a suitable replacement aestivation den. This also means that the individual relocating the snake needs to be able to identify aestivation microhabitat.
This Western Diamondback Rattlesnake was found by a snake relocator while searching for a suitable aestivation den to relocate a rattlesnake found at a home. This snake is a clue that the right release site is nearby. This careful release site selection is essential during the summer.
How to keep rattlesnakes out of the yard during the summer
The best way to keep snakes out of the yard during the hot, dry summer months is to reduce critical resources as much as possible. When it is this hot, rattlesnakes aren’t traveling around like they would be during the spring and fall, so the situations where they are found. This means rattlesnake encounters at homes are much more predictable and, therefore, avoidable.
Here are some things that can be done in a single weekend that can significantly reduce the chances of a summer rattlesnake den in the yard:
Do a sweep of the property for unnecessary water sources. This means fixing the leaky hose, cleaning up the outdoor dog bowl area, and checking on landscaping irrigation and drip lines to make sure they’re in good shape.
Watch areas of AC condenser run-off. You may be able to fix these situations by placing a metal can under them to prevent the ground from getting wet, and allow faster evaporation.
It’s time to get rid of those overgrown, over-watered lantana and rosemary bushes. They come standard with every home in Arizona, but consider native plants that require less water and are less likely to attract rattlesnakes and their prey.
Look into snake fencing as an option to physically prevent entry.
Find and fill any cracks and openings to the foundation of the home and other buildings. Any access to crawl spaces, flashing, under pavement and the driveway, or the foundation can become rattlesnake dens in the summer.
Carefully check seldom-visited sections of the yard: specifically pool pump areas and air conditioning units. These spots are usually hidden away and provide easy, private retreats for rattlesnakes and other animals.
Flood and destroy rodent burrows as they are found.
By this time, when rattlesnakes have already been at their summer retreats for several weeks, it’s more productive to prepare for what comes next: the monsoon activity, where encounters will be at the highest rate of the year.
What happens to rattlesnakes when the monsoon comes?
Once the monsoon rain comes, several events are kicked off.
First, the abundant ambient moisture and access to water relieve some of the survival pressure. Rattlesnakes will no longer be forced to hide away, meaning they can resume moving, hunting, and other activities. Rattlesnakes encountered in backyards will be less likely to be long-term residents. Aestivation dens are largely abandoned for the year for many species.
Often this is when rattlesnakes shed their skins, too. The moisture can start the shedding process, during which many rattlesnakes remain hidden away for a period of time, regardless of the nicer conditions outside. However, once they shed, they’re off to hunt and more.
Next, it’s time for babies! The moisture kicks off the birthing season. Rattlesnakes either birth in place, or move to special places where babies will be born, called rookeries. Depending on the species, the timing and location of this event varies. For Western Diamondback Rattlesnakes, which make up the bulk of rattlesnake encounters with homeowners, this can be about anywhere with adequate cover.
Questions and Answers about Summer Rattlesnake Activity:
Can I use a garden hose to move a rattlesnake away while it’s this hot?
You can, but it is likely a temporary solution. Rattlesnakes found in the yard right now are likely aestivating nearby, and will remain in the area until they can leave after the monsoon rain brings relief. Also, make sure the water isn’t too hot by spraying it to the side for a few seconds.
Are rattlesnakes more likely to be found indoors during this time?
Yes, but it’s still a very remote possibility. Even though indoors is obviously cooler, very few rattlesnake removal calls are inside homes during this time of year. The majority of rattlesnake in-home calls we respond to are due to doors being left open in the Spring and Fall, which is not an issue when it is above 110˚F outside.
Do rattlesnakes climb trees and shrubs to get away from the hot ground?
Rattlesnakes are often found up off the ground in bushes outside of their aestivation dens when it is this hot outside. A bit of airflow can help a snake keep cool, and they seem to take advantage of it.
How often do we find rattlesnakes that have died from the heat?
In our research of rattlesnakes living in urban islands, it is not uncommon to find rattlesnakes that have died during the hot and dry foresummer. This can be exacerbated by disturbance, such as stress from visitation or poorly performed relocation. An event as simple as a short delay from overnight location back to the den can mean death.
Am I attracting rattlesnakes if I provide water for generally preferable wildlife, such as rabbits and birds?
If this is being done in an area where rattlesnakes can occur: absolutely. Not only by providing water, but attracting prey animals as well. If there’s also an area the rattlesnakes can escape to during the day, it’s an ideal rattlesnake situation.
Where do wild rattlesnakes find water during the heat?
For the most part, they don’t. They are forced into a state of preservation, waiting for the monsoon rain to come. Others may find water at springs, rivers and streams, cattle tanks, and other sources of year-round water. But for many rattlesnakes, this simply isn’t an option.
Can excessive heat cause negatively affect the reproductive success of rattlesnakes?
Yes. Conditions of prolonged heat and drought are difficult to survive for any age of rattlesnake, with newborns being especially susceptible. In the summer of 2020, during a long period without rain and excessive heat, we observed that speckled rattlesnakes more often gave birth at aestivation dens rather than move to typical locations. This was mirrored in birthing events of Western Diamondback Rattlesnakes and others, giving birth in less-than-ideal situations. While these effects aren’t well documented, our observations and anecdotal experience with birthing in urban situations show, essentially: panic.
What do rattlesnakes do on hot ground or pavement when it’s this hot outside?
They die. This is why it is avoided at all costs, and it’s lethal to them when the fire department dumps them into a bush rather than relocate to a suitable area.
Are there any repellents that can be used to keep rattlesnakes from spending the summer in my cooler, wetter backyard?
Unfortunately there are no snake repellents on the market that will keep snakes of any species away, despite claims. The effective alternatives are a combination of habitat and resource reduction and, where applicable, snake fence installation.
Do rattlesnakes mate when it’s this hot?
Rattlesnakes can court and mate at any time of year, but typically the seasons for doing so are in the spring and fall, depending on species.
Is it ok to leave water our for rattlesnakes and other wildlife?
Yes it is! Just be sure that it is clean and does not become a disease vector. Also understand that doing so will indiscriminately invite wildlife to the area, and it’s not possible to pick and choose. Leaving water out for birds and bunnies is the same as doing so for rattlesnakes.
Are there specific scents or chemicals that can be applied to deter rattlesnakes?How about plants?
There are currently no products, operating either by scent or otherwise, that will effectively deter rattlesnakes and would be legally and ethically feasible.
The rumors about plants such as rosemary, lemongrass, mint, and other “snake-repellent” plants are just local mythology. Ironically, some of these, such as rosemary, provide deep ground cover that can actually attract rattlesnakes.
Does the application of lava rock, gravel or other small rocks deter rattlesnakes?
While these materials do not directly deter rattlesnakes, they may provide some protection in some areas simply by being hot ground cover. However, using these materials specifically for rattlesnake deterrent purposes would not be advisable. Remember that rattlesnakes live in very hot, rough environments. Using rocks, even sharp rocks like lava rock, would not have an effect.
How often do rattlesnakes need to drink?
If given an opportunity, they can drink every day. However, they are very efficient and many ways of preserving moisture through their behavior and physiology, and can go for several months without a drink if they must.
What can I do to help the rattlesnakes without causing unintended danger (to either them or me)?
This may seem like a non-answer, but simply having the attitude that rattlesnakes should be kept alive and are important wildlife is an important node contributing to changing culture. Perhaps the best thing someone can do, if they are aware of the potential risks associated and are able and willing to communicate as needed to visitors and others, is to simply leave the rattlesnakes in place.
At my own home, for example, we have discovered an aestivation den of Western Diamondback Rattlesnakes hiding out under the AC unit behind the house. It’s not in an area with immediate concern, but we know it’s there and make sure we behave appropriately. Rather than relocate these, we will allow them to stay there for the remainder of the aestivation period, then will likely repair the leaky AC drip that has caused the situation. We know there are several nearby and suitable aestivation sites in the immediate area, so loss of this one will not have negative consequences for these snakes.
The rumors are out there, and it’s true! Rattlesnake encounters spike in October, and it’s happening right now throughout much of the state. But, this is completely normal, happens every year, and it’s not really anything to worry about. Let’s take a look at the reasons, and why you shouldn’t be too concerned.
If you haven’t been outside yet this morning: it’s cold!
Rattlesnakes don’t have sweatpants and blankets, so they have work to do to avoid it. That means there’s a lot of activity in October, especially in the late afternoon and just after dark. They’re making movements to wherever they’re going to spend the winter … and it just so happens that this occurs right when people spend more time outside enjoying the cooler weather.
More people moving at the same time that more snakes are moving = more snake encounters. This is normal, and happens every year Add in a continued hockey-stick upward graph of population and development, and you have record encounter figures.And no, there is not, as I’ve seen a few post out there, a “bumper crop” of rattlesnakes.
They don’t spring forth from the Earth when water touches it. It would take several years of consecutively prime conditions to result in both higher birth rates and survivorship of young that could show a measurable increase in the rattlesnake population. Even then, their natural predators (every animal with a pulse in the desert) would put it right back where it should be.
The rumor mill is abuzz (see what I did there?)
I am fortunate that the local news allows me to comment on these kinds of rumors, and put it into perspective. Rumors like this can be problematic, and lead to dangerous situations for people and snakes. A person can have a totally normal experience, like seeing two rattlesnakes on a single bike ride, and then remember hearing from old Larry at the feed store that there’s a gull durn rattler invasion happening. That person might then take that typical experience of seeing multiple rattlesnakes and incorrectly use it to confirm Larry’s herpetological theories. Then come further posts, some causing people to do things like kill snakes to “help”, putting themselves in danger in the process.
Now that we know all of this, check out this video from KOLD in Tucson that explains.
More information on that snake fencing mentioned in the article:
In response, we’ve created a video that is our best response to the question. It’s long but comprehensive. It’s not just learning how to look at features, but addresses topics that cause confusion and cognitive bias that can really get in the way when seriously trying to learn to identify rattlesnakes. This video will walk you through the best way look at key features with a logical approach to differentiate between Mojave Rattlesnakes and Western Diamondback Rattlesnake.
What can you do? “Count the scales on the head”, someone says … but how useful is that in real-life situations? “Tail bands look different”, another comment will read … compared to what? There are thousands of photographs of both species online, but telling the difference between a Mojave Rattlesnake and a Western Diamondback Rattlesnake is still a point of confusion.
Build your skills to identify a Mojave Rattlesnake vs Western Diamondback Rattlesnake
In the video, we end with the mention of a short quiz you can take to see how well you know the difference between Mojave and Western Diamondback rattlesnakes. It’s 40 images, randomly selected and ordered, with 1 point per correct answer. When you’re done, you’ll see a link to check your score, and your answers. However, we encourage you to skip looking at which ones you got right or wrong, so that you can continue to improve your identification skills by taking the test again.
Is this photograph of a giant rattlesnake from Arizona real? That question has dominated my inbox for the last few days, so here’s the answer.
Yes, this photo is 100% real. There is no photoshop involved whatsoever.
However, the snake is not nearly as large as it’s made out to be. It appears to be a standard-sized adult Western Diamondback Rattlesnake for Arizona at around 3′ long.
This is yet another example of an illusion called forced perspective. In real life, your stereoscopic vision (two eyes) gives you depth perception, so you can clearly see that things that are closer to you aren’t actually larger. However, a camera just has one eye – the lens – so it isn’t always as apparent.
But why isn’t it obvious? It’s a no-brainer that closer things look larger on camera. It’s likely the subject matter. If someone held up an every day thing, like a water bottle, you’d not immediately share the photo with your Facebook friends about someone drinking from a 6′ tall bottle. The fact that the subject is a rattlesnake seems to short circuit that part of the brain, and you’re left staring at what seems to your eyes a very, very large rattlesnake.
Exactly why this same photo keeps popping up, though, reported from different cities, states, and even claims to be the photographer, are more interesting. For whatever reason, these photos are useful vehicles to get attention, and many people on social media eat it up. The first two locations I’ve seen were Peoria, AZ and Oro Valley, AZ … so the real location is probably one of those.
So it’s a rattlesnake alright, there’s nothing at all extraordinary about this situation.
An article has been going around showing a Western Diamondback Rattlesnake sitting high in a tree, prompting many emails and messages asking about its validity.
This is normal behavior: rattlesnakes can and do climb trees, though it is not commonly observed. There is no reason to think that the series of photos was faked, staged, shopped, or anything but a totally natural observation.
Despite many comments saying this is a giant rattlesnake, and/or photoshopped … it’s not.
How do we know that? We see rattlesnakes in trees sometimes. A variety of species in very different areas all find some need to occasionally wander up the bark of a tree. Over the years, I have personally seen Blacktailed Rattlesnakeds, Western Diamondback Rattlesnakes, Speckled Rattlesnakes, Tiger Rattlesnakes, and Banded Rock Rattlesnakes in branches over my head. Additionally, Timber Rattlesnakes and other east-coast species have been repeatedly seen high in the trees.
An example: here’s a Western Diamondback Rattlesnake I saw just last night. It was disturbed by my flashlight and fled into the bushes … where it suddenly started to climb. It went higher and higher, and was still up there when I passed through the area again hours later. This snake decided the best escape route was: up.
Here’s a Blacktailed Rattlesnake seen on a job site by Jeff Martineau, one of our field team, as it ascended a tree. Blacktails are known to climb like this, possibly to hunt birds and squirrels.
Going up! Photo by Jeff Martineau
Here’s another Blacktail, which I saw from the edge of a road high in a tree, clearly not photoshopped 😉
Why do rattlesnakes climb trees?
There are probably a variety of reasons why a rattlesnake would climb a tree, but in most cases, I would assume that it’s to access prey. If you’re able to get off the ground, a lot of potential prey items, like birds and squirrels. They may also climb to escape predators, to stay cool, or to escape potential flood water during the monsoon season.
Are rattlesnakes going to drop out of the trees?
Almost certainly not. I suppose a snake could happen to make a mistake and fall out, and if you’re walking by right at that second you could possibly have a rattlesnake falling out of a tree onto you. But that’s an extremely remote, chance circumstance that isn’t worth worrying about.
You may have heard friends from the east claim that water moccasins routinely jump from trees into the canoe, too … but we’ll just gently say that they are completely full of it. Sure, it’s possible that someone scared a snake at the right time but and there are likely a handful of “lightning strike” type scenarios where this has possibly happened, but it’s not what they “do”. It’s like saying that the handful of dogs each year who accidentally disengage a parking brake and end up rolling the car down the street qualify the statement of “dogs drive cars”. Just think it through.
Does this mean they can climb the wall and get into my yard?
Not at all. Rattlesnakes can climb if there are sufficient rough surfaces to grip, which excludes your block wall or rattlesnake fence (if it’s installed properly) While they clearly can and do climb, they’re not nearly as good at it as a snake like a Gophersnake, Kingsnake, or Coachwhip, which are built for the task. If you’ve got a secured yard without “footholds” for lack of a better term, you should not expect rattlesnakes in the yard.
Here’s a video explaining how rattlesnakes climb … or don’t … smooth surfaces.
How high can a rattlesnake climb on a smooth surface? Not very far, it seems.
To close: a note to those on social media who like to shout answers on topics they don’t know much about: stop it 🙂 A simple google search in advance would have shown you how often rattlesnakes are actually found in trees, and that it’s totally normal. Here are some other videos of this behavior that I’ve found out there:
Better late than never – rattlesnakes are giving birth, even without the rain. One of the services we offer are serial property inspections, to continuously monitor properties to evaluate possible rattlesnake activity and provide recommendations to landscapers, pest control, and property managers.
We have been inspecting this particular property for many years, and this is the most interesting thing found there to date.
On the previous inspection, Greyson noted a shed skin in an area at the edge of the property. Knowing a fresh shed during this hot and dry period could indicate an estivation den nearby, he focused on that spot during his visit yesterday, and, whoa.
This mother rattlesnake gave birth to babies after being captured at a home in Phoenix.
Here is what was found: a late-season estivation den with a mixed bag of Western Diamondback Rattlesnakes, with one having given birth in the recent past, and another in a deep blue phase (preparing to shed skin)
While this is not entirely unusual, what is different about this year is that we are seeing that rattlesnakes are having their babies later than usual, and they are doing so in their estivation dens instead of moving to their usually-preferred birthing spots.
This is likely a response to our exceptionally hot (the hottest on record) summer and near-complete lack of rain. This is similar to a recent visit to a home by Dave in Tucson (I’ll be posting this shortly as well) where he captured a total of 14 rattlesnakes.
Are rattlesnakes giving birth later this year than normal?
According to our observations and activity on the relocation hotline: yes, it appears that rattlesnakes are having babies later this year than usual. In a normal year, we start to receive our first calls to capture groups of mother Western Diamondback Rattlesnakes with their newborn babies in early July, usually hitting its peak around the first week of August, then trickling in here or there until around the first week of September. This year, it took much longer for this to be normal, only now (mid-August) has it become routine.
Rattlesnakes give live birth and hang out with the babies for a period of time afterward.
Likewise, rattlesnakes seen in informal surveys and in our study of rattlesnakes in the Phoenix Mountain Preserve have shown that Western Diamondback Rattlesnake and Tiger Rattlesnakes that would have likely given birth by now are still languishing in a gravid (pregnant) state at estivation dens.
While this is in no way a full representation of what’s happening out there, but does represent 10 years of data collection and informal survey observations. It should also be noted that while this is the case in the Phoenix and Tucson areas, it is unlikely to represent behavior in other regions.
Why are baby rattlesnakes being born later this year than usual?
This year makes that a little bit tougher than normal. If monsoon rain triggers pregnant rattlesnakes to give birth, what happens when there is no rain at all?
They have to give birth eventually … so what we are seeing is this: The mother rattlesnakes are staying at estivation sites (spots selected to hide away during the hottest summer months) far longer than they normally would. Rather than moving to a birthing site as they normally would, they are having their babies right in place.
This likely isn’t good for the babies, ultimately and unfortunately. They lose moisture more than twice as quickly as adults (J. Agugliaro, H. Reinert 2005). Unless we get some rain soon, that could be big trouble for this year’s babies. We’re hoping for the best, but looking at the forecast … hoping is all there is to do.
How homeowners can keep baby rattlesnakes out of the yard
Keeping the smallest rattlesnakes out of your area is a bit different than the larger ones.
First, the space they need to get in is much smaller … anything more than about a third of an inch can allow access. Second, they make frequent movements and may not necessarily know where they’re going. Unlike adults, who’ve had a lifetime to map out a homerange, babies may show up any place, any time. For that reason, physical barriers are the best bet. Rather than go too far into detail here, I’ll refer you to our guide to keep baby rattlesnakes out of the yard.
References
Schuett, G.W., Repp, R.A., Hoss, S.K. and Herrmann, H.‐W. (2013), Parturition in a Desert Rattlesnake. Biol J Linn Soc Lond, 110: 866-877. doi:10.1111/bij.12166
Agugliaro J, Reinert HK. Comparative skin permeability of neonatal and adult timber rattlesnakes (Crotalus horridus). Comp Biochem Physiol A Mol Integr Physiol. 2005;141(1):70-75. doi:10.1016/j.cbpb.2005.04.002
Here’s the video version of this post is that’s your thing.
A common request from homeowners and something I see people comment about quite often is the idea of capturing, buying, or importing kingsnakes and gophersnakes to release in the yard as a means to control rattlesnakes.
Kingsnakes, as you may be aware, are famous for making meals of venomous rattlesnakes. They completely harmless (even to kids and dogs) and even nice to look at. Because of their rattlesnake-eating preferences, many homeowners are more than happy to see a kingsnake cruising through the yard.
So why wait for nature to bring the kings to your yard? Can’t you just buy one at the pet store and let it go? How about someone in town who’s caught a wild one and does’t want it? Why not bring in a bunch of them to release and then never see a rattlesnake again? Unfortunately, it’s a lot more complicated than that.
It’s increasingly common to see requests like this on Facebook and Nextdoor, where communities of rattlesnake-averse homeowners compare snake experiences. “You don’t want that kingsnake? Bring it to my yard!”. There are also suggestions (and admissions) of buying kingsnakes from the petstore to release. Please, never do this.
Releasing kingsnakes into your yard is not a good idea and almost certainly will not help your rattlesnake issues.
Bubble burst: if your yard has sufficient food sources and resources to support a kingsnake, you already have one. The population and distribution of kingsnakes (and other snakes) is a complicated balance of predator and prey, intraspecies dynamics. It’s like pouring water onto a flat surface expecting it to pile up; the kingsnake you release will almost certainly just wander off, not to be seen again.
If you have rattlesnakes in the yard, you also have kingsnakes already hunting them. You may not see them very often, but moving around unseen is kind of a snakes’ thing. You could release as many kingsnakes into the yard as you want. If there isn’t sufficient food for them, they’re out!
Worse, unless you live in the same area as it’s used to so that it can resume its life, your new pest control idea will probably die out there.
Even worse than that, if you’re bringing kingsnakes in from other areas, you run the risk of spreading parasites and disease to the existing group of kings — your efforts to have more kingsnakes have a chance to make you have no kingsnakes.
Having other snakes in the yard is the best way to attract kingsnakes.
What can you do to get more kingsnakes in the yard?
There is one way 🙂 but you’re not going to like it. Get more rattlesnakes! Really though, prey opportunities are the best way to attract any snake to the yard. Unfortunately, you can’t really do that without also attracting the snakes you don’t want around, too.
It seems the idea of introducing kingsnakes to your yard to keep rattlesnakes away just isn’t as helpful as it may seem. Just stick to the basics of keeping snakes out of the yard and if a kingsnake shows up to help, that’s great! But she doesn’t need any help.
This goes for Gophersnakes and Bullsnakes too. These snakes, by the way, don’t actually eat rattlesnakes like the saying goes … but that’s for another article.
Sometimes, but it’s not an absolute, and should not be used as a single method for identification of either species.
The general rule is that Western Diamondback Rattlesnakes have a banding on the tail in a roughly 1:1 ratio of white to black, while Mojave Rattlesnakes tend to have tail banding at 2:1 white to black. However, it can be much more complex than that.
This Western Diamondback Rattlesnake is a good boy and following the rules with a clearly-marked tail banded at about 1:1 ratio of white to black.
While it is generally true that Mojave Rattlesnakes tend to have wider white bands compared to Western Diamondback Rattlesnakes, this can be problematic. Both Western Diamondback Rattlesnakes and Mojave Rattlesnakes have banded tails with a high degree of variability in color, pattern, and complexity.
Here is a video that explains all of this:
This obedient Mojave Rattlesnake is showing off the 2:1 white to black ratio.
In general, when identifying a rattlesnake, it is not advised to focus on any single feature. Instead, more accurate identifications can be made by looking at the gestalt, or overall appearance and culmination of attributes of the animal. The tail banding is one feature that can be a clue to help someone unfamiliar with both species differentiate between them, but is not enough to make an absolute identification.
This Western Diamondback Rattlesnake is not following the rules, and has much more white on her tail than black. If only looking at tail-banding as a key characteristic, this Western Diamondback would be incorrectly identified as a Mojave Rattlesnake
The same can be said for almost any feature, including the 2-scales between the eyes method. As an example, this Mojave Rattlesnake has 3 of these scales. In a quick post to our snake identification page on Facebook, this lead many people to incorrectly identify this snake as a Western Diamondback Rattlesnake, when the overall appearance is clearly that of a Mojave Rattlesnake.
Another Western Diamondback Rattlesnake that apparently didn’t see the comment on Facebook that they can’t have this arrangement of tail bands.When identifying snakes, it is best to look at the entire animal and use features as clues rather than rely entirely on any single trait
One of the biggest questions we get each November, when homeowners are surprised that snakes keep showing up in their social media feed: When do snakes go to sleep?
For snakes, that answer can be complicated. Snakes don’t really hibernate in the winter in the sense most of us are familiar with. Instead, they go into a state called brumation. During brumation, snakes live in their dens, but they’ll come out to bask in the sun on pleasant winter days.
Rattlesnakes in the Phoenix and Tucson areas can generally be found at the dens from October through March. When people see them basking outside of their dens, it sends waves of panic through news outlets, who report that snakes are coming out earlier that year. They say the same thing every year, even though snakes emerge right on time.
Their move towards dens (ingress) and out of dens (egress) is prompted by average temperatures, and other factors. If there are a few warm days in January, rattlesnakes might come out to bask and be spotted by people, but they are not starting their spring activity yet. They know not to leave their dens completely before temperatures have stabilized.
Garages are common places to find rattlesnakes in the wintertime. To them, it’s just another cave!
What makes a rattlesnake den?
Rattlesnakes choose very specific dens with steady temperatures during the coldest months. In the wild, these include large rock piles and caves with deep access. They know what’s best, even choosing the direction that the entrance faces.
On certain days, you’ll find rattlesnakes outside of their dens, basking in a mixture of shade and sunlight that brings their bodies to a comfortable temperature. They might be under a bush, between rocks or in the corners of a patio. This can be very surprising for homeowners.
Rain, too, can get snakes moving even on the coolest of days. In our area, rain is rare, and a drink is always welcome. A cloudy, drizzly day in the mid 60’s in January is an excellent day to see rattlesnakes on the surface.
Any opening into the foundation or interior areas of a wall can be used by rattlesnakes, like this baby Western Diamondback Rattlesnake that was found near a home in Tucson.
If you see one snake between November and March, there may be a higher possibility that more might be denning in the same area. Rattlesnakes can den communally without many territorial problems. If you see a snake in the area during the winter months, it’s important to be very careful and watch for other snakes. In our warm climate, those dens are usually small, with just a few individuals. You’ve probably seen photos online of holes with hundreds of rattlesnakes pouring out of holes in the ground, but that’s not how it looks in Arizona.
Rattlesnakes may return to the same den year after year. This can be interrupted when construction or landscaping changes the area, destroying the den that the snake is trying to find. In that case, the snake will wander to the next best area. Homeowners frequently see rattlesnakes on their properties after construction begins.
What to do in the winter to keep your home rattlesnake free.
If you live in a desert area, it’s still important to watch for snakes in the winter.
Look where you’re walking.
Make sure to check your yard before letting young children play outside.
If you’re having landscaping changed, or if construction begins in your area, keep a watchful eye out for wandering snakes.
Rattlesnake Fence installation is the best way to keep rattlesnakes out. Winter is often the best time to have it installed, with shorter wait times and often-cheaper prices.
If you see a snake, call us at ——-. One of our removal experts can relocate the snake and check your property. Something you may also want to consider is having a Rattlesnake Fence professionally installed in your yard. No matter what, when the snakes “wake up” in early March, you’ll want to be ready for it.
Add in a continued hockey-stick upward graph of population and development, and you have record encounter figures.And no, there is not, as I’ve seen a few post out there, a “bumper crop” of rattlesnakes. 
