Spermophilus washingtoni A. H. Howell, 1938 The Washington ground squirrel (Urocitellus washingtoni) is near threatened species of squirrel distributed in the Pacific Northwest states of Washington and Oregon, United States.

All Washington ground squirrels gain weight and prepare for hibernation in late spring and early summer.

One radiotracking study focused on dispersal of Washington ground squirrels.

Twenty to 56% of radio-collared juvenile squirrels survived to estivation.

Survival rates of dispersers were higher than non-dispersers, mostly due to badger predation on natal sites.