I guess a search answered my question:
GROUND SQUIRRELS (GOPHERS)
In spring, ground squirrels come out of their dens in April and May. The young are born about a month later, coming out of the burrows (holes dug in the ground) in early June.
Near the end of June, adult males go back into hibernation. Adult females do the same in July. But the young are active all summer. In September when there is less food to be found they go into hibernation.
SHELTER - They dig a burrow with many tunnels, openings, and different rooms ( called chambers ). If a predator ( enemy ) comes in one hole, they can escape out another hole.
FOOD - The Richardson's Ground Squirrels store some food During hibernation, they wake up every 10 to 14 days and have a snack.