Colorado
Snakes in Denver County
10 species have been documented here, 1 of them venomous.
Venomous snakes in Denver 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 Denver County
Western Terrestrial Garter Snake
Thamnophis elegans
Harmless
Gopher Snake
Pituophis catenifer
Harmless
Plains Garter Snake
Thamnophis radix
Harmless
Lined Snake
Tropidoclonion lineatum
Harmless
North American Racer
Coluber constrictor
Harmless
Common Watersnake
Nerodia sipedon
Harmless
Prairie Rattlesnake
Crotalus viridis
Venomous
Common Garter Snake
Thamnophis sirtalis
Harmless
Western Milksnake
Lampropeltis gentilis
Harmless
Boa Constrictor
Boa constrictor
Harmless
Compiled from verified GBIF & iNaturalist observations. Informational only.
Snakes in Denver County: FAQ
- Are there venomous snakes in Denver County, Colorado?
- Yes. 1 venomous snake species has verified records in Denver County, Colorado, including Prairie Rattlesnake. Most snakes in Denver County, Colorado, however, are harmless.
- How many snake species live in Denver County, Colorado?
- 10 snake species have verified records in Denver County, Colorado, of which 1 is venomous.
- What is the most commonly seen snake in Denver County, Colorado?
- The Western Terrestrial Garter Snake is the most frequently reported snake in Denver County, Colorado, based on verified wildlife observations.
- What should I do if I see a venomous snake in Denver County, Colorado?
- 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.