Montana
Snakes in Lewis and Clark County
6 species have been documented here, 1 of them venomous.
Venomous snakes in Lewis and Clark 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 Lewis and Clark County
Western Terrestrial Garter Snake
Thamnophis elegans
Harmless
Gopher Snake
Pituophis catenifer
Harmless
North American Racer
Coluber constrictor
Harmless
Prairie Rattlesnake
Crotalus viridis
Venomous
Northern Rubber Boa
Charina bottae
Harmless
Common Garter Snake
Thamnophis sirtalis
Harmless
Compiled from verified GBIF & iNaturalist observations. Informational only.