South Dakota
Snakes in Custer County
13 species have been documented here, 1 of them venomous.
Venomous snakes in Custer 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 Custer County
Western Terrestrial Garter Snake
Thamnophis elegans
Harmless
North American Racer
Coluber constrictor
Harmless
Prairie Rattlesnake
Crotalus viridis
Venomous
Gopher Snake
Pituophis catenifer
Harmless
Common Garter Snake
Thamnophis sirtalis
Harmless
Smooth Greensnake
Opheodrys vernalis
Harmless
Red-bellied Snake
Storeria occipitomaculata
Harmless
Eastern Milksnake
Lampropeltis triangulum
Harmless
Plains Garter Snake
Thamnophis radix
Harmless
Plains Hognose Snake
Heterodon nasicus
Harmless
Ring-necked Snake
Diadophis punctatus
Harmless
Western Milksnake
Lampropeltis gentilis
Harmless
Pine Snake
Pituophis melanoleucus
Harmless
Compiled from verified GBIF & iNaturalist observations. Informational only.