Colorado records
Common Garter Snake in Colorado
HarmlessThamnophis sirtalis

Yes. The Common Garter Snake has been recorded in 16 Colorado counties. It is non-venomous (harmless). Slender body with three light stripes running the length of a darker back.
Colorado counties with Common Garter Snake records
16 listedSee the full Common Garter Snake profile or all snakes in Colorado.