State herp calendar
Reptiles and Amphibians of Wyoming
Wyoming is high, dry and cold, so the herp list is short. Western Terrestrial Garter Snakes and Gopher Snakes are the most-reported herps. Boreal Chorus Frogs call right after snowmelt. May is the busiest month, and the Prairie Rattlesnake lives here.
12 species5 ecoregions1 venomous
Search entire stateSpecies out across Wyoming, by group and month
| Group | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Snakes | 3 | 4 | 4 | 4 | 4 | 4 | 2 | |||||
| Lizards | 2 | 2 | 2 | 2 | 2 | 2 | ||||||
| Turtles | 1 | 1 | 1 | |||||||||
| Frogs and Toads | 1 | 4 | 4 | 4 | 4 | 4 | ||||||
| Salamanders | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
Numbers = species active that month (at peak or just starting / winding down).
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Hi, I'm Nick. I built Herp Calendar on my own and I keep it free, with no ads. If it has helped you find a herp this season, a small tip goes straight into the hosting and the data work. Only if you can spare it. Either way, I'm glad you're here.
Pick your ecoregion
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Tap a region to see what's out
Ecoregions of Wyoming
Seasons shift a lot between Wyoming's ecoregions. Pick the one nearest you for a 12-month calendar of what's out.
Middle Rockies and Wyoming Basin
10 speciesHigh, cold country with a short season and just a handful of herps.
View calendar →Southern Rockies
17 speciesHigh mountains where garter snakes and tiger salamanders make the most of summer.
View calendar →Northern Great Plains
15 speciesOpen prairie and pothole ponds with leopard frogs, painted turtles and rattlesnakes.
View calendar →High Plains
24 speciesShortgrass prairie and playa lakes with plains toads and prairie rattlesnakes.
View calendar →Wasatch and Uinta Mountains
9 speciesHigh Utah mountains with sagebrush lizards and garter snakes.
View calendar →Venomous here: Prairie Rattlesnake. Don't handle any snake you can't identify.
About Wyoming
When are reptiles and amphibians most active in Wyoming?
May is the busiest month in Wyoming, with 10 species at peak activity. At least half of the area's species are active from April through September.
What reptiles and amphibians live in Wyoming?
12 species have enough iNaturalist records to show here: 4 snakes, 4 frogs and toads, 2 lizards, 1 salamander, and 1 turtle. The most-reported are the Western Terrestrial Garter Snake, Gopher Snake, and Greater Short-horned Lizard.
Are there venomous snakes in Wyoming?
Yes. The Prairie Rattlesnake lives here. Don't handle them.
Where does this data come from?
Activity calendars are built from iNaturalist research-grade observations (downloaded through GBIF, September 2026), corrected for how many people are out observing each month. Rare and protected species are left off on purpose.