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Reptiles of Washington

Puget Sound gartersnake
(Thamnophis sirtalis pickeringii)


What they look like

  • The Puget Sound gartersnake has a black upper side, an underside that varies from blue to lime green, and sides in-between that have a pattern of both black and its underside color.

Where they live

  • Found exclusively in the Puget Sound area of Washington.

What they eat

  • Puget Sound gartersnakes feed on fish, slugs, worms, tadpoles, frogs, and occasionally small rodents.


  • Between late July and October, females give live birth to 12 to 40 young.

Cool Biology Facts

  • Common gartersnakes (Thamnophis sirtalis) are the second-most commonly encountered snakes in Washington. 


Distribution Map


Common gartersnakes (Thamnophis sirtalis) are considered “least concern” due to their extremely large distribution and large stable populations.