South Dakota
Snakes in Custer County
11 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
Compiled from verified GBIF & iNaturalist observations. Informational only.
Snakes in Custer County: FAQ
- Are there venomous snakes in Custer County, South Dakota?
- Yes. 1 venomous snake species has verified records in Custer County, South Dakota, including Prairie Rattlesnake. Most snakes in Custer County, South Dakota, however, are harmless.
- How many snake species live in Custer County, South Dakota?
- 11 snake species have verified records in Custer County, South Dakota, of which 1 is venomous.
- What is the most commonly seen snake in Custer County, South Dakota?
- The Western Terrestrial Garter Snake is the most frequently reported snake in Custer County, South Dakota, based on verified wildlife observations.
- What should I do if I see a venomous snake in Custer County, South Dakota?
- Keep your distance and do not try to catch or kill it. Most bites happen when people handle or corner a snake. If someone is bitten, contact local emergency services or poison control immediately.