Wyoming snakes: ID chart

16 snakes, 2 venomous (listed first). Last checked November 3, 2026.

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The 2 venomous snakes come first: Midget Faded Rattlesnake, Prairie Rattlesnake. The rest follow from A to Z, each with a photo where we have one and a short note on where it lives in Wyoming. The chart prints on letter or A4 paper; on screen, open any name on the Wyoming snakes page for photos, range and sources.

Midget Faded Rattlesnake

Crotalus oreganus concolor

Venomous

Range is restricted to the lower Green River Valley from the cities of Green River and Rock Springs south to …

Prairie Rattlesnake

Crotalus viridis

Venomous

In Wyoming, Prairie Rattlesnakes occur in all counties east of the Continental Divide and in Carbon County …

Bullsnake

Pituophis catenifer sayi

Non-venomous

Desert Striped Whipsnake

Coluber taeniatus taeniatus

Not stated

Eastern Yellow-bellied Racer

Coluber constrictor flaviventris

Non-venomous

Great Basin Gophersnake

Pituophis catenifer deserticola

Non-venomous

Found in southwest Wyoming.

Northern Rubber Boa

Charina bottae

Non-venomous

No confirmed photo of Plains Black-headed Snake

Plains Black-headed Snake

Tantilla nigriceps

Not stated

Has been found in Platte County.

Plains Gartersnake

Thamnophis radix

Not stated

Plains Hog-nosed Snake

Heterodon nasicus

Not stated

Red-bellied Snake

Storeria occipitomaculata

Not stated

Red-sided Gartersnake

Thamnophis sirtalis parietalis

Non-venomous

Smooth Greensnake

Opheodrys vernalis

Not stated

Valley Gartersnake

Thamnophis sirtalis fitchi

Non-venomous

Wandering Gartersnake

Thamnophis elegans vagrans

Non-venomous

Western Milksnake

Lampropeltis gentilis

Non-venomous

A picture cannot confirm what an animal is or that it is safe. Never handle a wild animal. Sources: Reptiles in Wyoming (species list) (Wyoming Game and Fish Department); Reptiles - Devils Tower National Monument (National Park Service); Atlas of Birds, Mammals, Amphibians, and Reptiles in Wyoming (Wyoming Game and Fish Department, Nongame Section); Midget Faded Rattlesnake - Crotalus oreganus concolor (SWAP 2017 species account) (Wyoming Game and Fish Department); Reptiles - Grand Teton National Park (National Park Service); Prairie Rattlesnake - Yellowstone National Park (National Park Service); and others listed on the web page. stateswildlife.com/wyoming/snakes/