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Snakes in Colorado

Here are common snakes found in Colorado, including 1 venomous species to watch for. Tap any snake for a full identification profile.

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Caution

Venomous snakes in Colorado

Beware of rattlesnakes sign posted in a grassy area, cautioning travelers.
Venomous

Prairie Rattlesnake

Crotalus viridis

The classic rattlesnake of the Great Plains. Well-camouflaged in dry grass, with a potent venom that makes it the main medically significant snake across the central US.

Danger 4/5
Beneficial

Harmless snakes in Colorado

Detailed close-up of a gopher snake in its natural habitat, showcasing its textured scales and earth-tone coloring.
Non-venomous

Gopher Snake

Pituophis catenifer

A large harmless constrictor that imitates a rattlesnake by hissing loudly, flattening its head and vibrating its tail. No rattle and round pupils give it away.

Danger 0/5
Macro photo of coiled Eastern Massasauga rattlesnake displaying scales and patterns.
Mildly venomous

Western Hognose Snake

Heterodon nasicus

A small, stocky, theatrical snake and a wildly popular pet. It hisses, flattens its neck and plays dead — but is essentially harmless to humans.

Danger 1/5

Identifying snakes in Colorado

Knowing your location is one of the most powerful tools in snake identification. Many snakes look similar, but the species actually present in Colorado narrows the possibilities dramatically. When you use our snake identifier, factor in your state to boost confidence — and if you ever spot a snake you can't identify, treat it as potentially dangerous and keep your distance.