Colorado
Snakes in Jefferson County
15 species have been documented here, 1 of them venomous.
Venomous snakes in Jefferson County
Full guide & what to do if bitten →
Prairie RattlesnakeCrotalus viridisVenomousHeavy body, broad triangular head, vertical (cat-like) pupils, and a segmented keratin rattle at the tail tip.
Every snake recorded in Jefferson County
Western Terrestrial Garter Snake
Thamnophis elegans
Harmless
Gopher Snake
Pituophis catenifer
Harmless
Prairie Rattlesnake
Crotalus viridis
Venomous
North American Racer
Coluber constrictor
Harmless
Plains Garter Snake
Thamnophis radix
Harmless
Western Milksnake
Lampropeltis gentilis
Harmless
Common Watersnake
Nerodia sipedon
Harmless
Smooth Greensnake
Opheodrys vernalis
Harmless
Common Garter Snake
Thamnophis sirtalis
Harmless
Lined Snake
Tropidoclonion lineatum
Harmless
Plains Hognose Snake
Heterodon nasicus
Harmless
Plains Black-headed Snake
Tantilla nigriceps
Harmless
Tantilla selmae
Harmless
Eastern Milksnake
Lampropeltis triangulum
Harmless
Pine Snake
Pituophis melanoleucus
Harmless
Compiled from verified GBIF & iNaturalist observations. Informational only.