Ecoregion
Snake River Plain Reptiles and Amphibians by Month
The Snake River Plain is lava rock, sagebrush and irrigated farmland. Gopher Snakes are the most-reported herp. Western Fence Lizards and Common Side-blotched Lizards sun on the rocks. May is the busiest month. The Western Rattlesnake lives here, and the American Bullfrogs and Pond Sliders here are introduced.
17 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 Snake River Plain, by group and month
| Group | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Snakes | 1 | 6 | 6 | 6 | 5 | 4 | 4 | 3 | 1 | |||
| Lizards | 1 | 2 | 6 | 6 | 6 | 6 | 6 | 6 | 2 | |||
| Turtles | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | ||||
| Frogs and Toads | 2 | 3 | 4 | 4 | 4 | 2 | 2 | 2 |
Numbers = species active that month (at peak or just starting / winding down).
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13 species at peak or shoulder in September
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shoulderAbout Snake River Plain
When are reptiles and amphibians most active in the Snake River Plain?
May is the busiest month in the Snake River Plain, with 17 species at peak activity. At least half of the area's species are active from April through September.
What reptiles and amphibians live in the Snake River Plain?
17 species have enough iNaturalist records to show here: 6 snakes, 6 lizards, 4 frogs and toads, and 1 turtle. The most-reported are the Gopher Snake, Western Fence Lizard, and Common Side-blotched Lizard.
Are there venomous snakes in the Snake River Plain?
Yes. The Western Rattlesnake lives here. Don't handle them.
Which reptiles and amphibians in the Snake River Plain are introduced?
The American Bullfrog is not native here.
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.