Snakes in South Dakota

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

Identify a snake in South Dakota Snake bite first aid

Caution

Venomous snakes in South Dakota

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 South Dakota

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 South Dakota

Knowing your location is one of the most powerful tools in snake identification. Many snakes look similar, but the species actually present in South Dakota 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.