Ecoregion
Middle Rockies and Wyoming Basin Reptiles and Amphibians by Month
This is high, cold country with a short summer. Only a handful of herps live here. Western Terrestrial Garter Snakes and Columbia Spotted Frogs are the most common. Boreal Chorus Frogs call right after snowmelt. May is the busiest month, and the Prairie Rattlesnake lives in the lower basins.
10 species1 venomous
Peak and shoulder ratings are rough guidance, not a schedule. Weather, elevation and the year can shift any species by weeks.
Rare and protected species are left off on purpose. Look, don't take, and never handle a venomous snake.
Species out in Middle Rockies and Wyoming Basin, by group and month
| Group | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Snakes | 5 | 5 | 5 | 5 | 5 | 5 | 4 | |||||
| Lizards | 1 | 1 | 1 | 1 | 1 | 1 | ||||||
| Turtles | 1 | 1 | 1 | 1 | 1 | 1 | 1 | |||||
| Frogs and Toads | 2 | 2 | 2 | 2 | 2 | 2 | 2 | |||||
| Salamanders | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
Numbers = species active that month (at peak or just starting / winding down).
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10 species at peak or shoulder in September
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shoulderAbout Middle Rockies and Wyoming Basin
When are reptiles and amphibians most active in the Middle Rockies and Wyoming Basin?
May is the busiest month in the Middle Rockies and Wyoming Basin, with 9 species at peak activity. At least half of the area's species are active from April through October.
What reptiles and amphibians live in the Middle Rockies and Wyoming Basin?
10 species have enough iNaturalist records to show here: 5 snakes, 2 frogs and toads, 1 lizard, 1 turtle, and 1 salamander. The most-reported are the Western Terrestrial Garter Snake, Columbia Spotted Frog, and Gopher Snake.
Are there venomous snakes in the Middle Rockies and Wyoming Basin?
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.