This is likely the same Western Diamondback that was inside of the house just an hour earlier.
The homeowner spotted the snake, opened the front door, and let the snake see itself out. About an hour later, the snake was found trying to hide under some landscaping. After searching the property, it seems very likely that, after exiting through the front door, the snake simply followed the foundation of the home until it found the drain hole in the block leading to the backyard.
This house was near a mountain, but also situated deep in the neighborhood, nowhere near any sort of drainage. The homeowner later said that the sliding glass patio door had been left slightly open, and he thinks the snake probably found its way in through the gap. He was confident that it was the same snake, which now has a new home in a packrat nest in the rocks on the nearby mountain.
