State herp calendar
Reptiles and Amphibians of Idaho
Idaho is lava plains in the south and mountain forest in the north. Western Terrestrial Garter Snakes and Gopher Snakes are the most-reported herps. Western Fence Lizards and Common Side-blotched Lizards like the southern deserts. June is the busiest month, and the Western Rattlesnake lives here.
24 species7 ecoregions1 venomous
Search entire stateSpecies out across Idaho, by group and month
| Group | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Snakes | 2 | 7 | 7 | 7 | 6 | 6 | 7 | 5 | 2 | |||
| Lizards | 1 | 3 | 7 | 7 | 7 | 7 | 7 | 7 | 3 | 1 | ||
| Turtles | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | ||||
| Frogs and Toads | 1 | 3 | 4 | 6 | 6 | 6 | 5 | 5 | 3 | 1 | ||
| Salamanders | 1 | 1 | 2 | 2 | 2 | 2 | 2 | 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 Idaho
Seasons shift a lot between Idaho's ecoregions. Pick the one nearest you for a 12-month calendar of what's out.
Snake River Plain
17 speciesLava plains and sagebrush with gopher snakes, fence lizards and rattlesnakes.
View calendar →Northern Rockies
14 speciesMountain forest and river valleys with garter snakes and spotted frogs.
View calendar →Middle Rockies and Wyoming Basin
10 speciesHigh, cold country with a short season and just a handful of herps.
View calendar →Great Basin
28 speciesSagebrush desert where lizards rule and rattlesnakes den in the rocks.
View calendar →Eastern Cascades and Blue Mountains
18 speciesPine forest and sagebrush where fence lizards and gopher snakes like the heat.
View calendar →Columbia Plateau
15 speciesDry sagebrush and wheat country where gopher snakes and rattlesnakes are the main finds.
View calendar →Wasatch and Uinta Mountains
9 speciesHigh Utah mountains with sagebrush lizards and garter snakes.
View calendar →Venomous here: Western Rattlesnake. Don't handle any snake you can't identify.
About Idaho
When are reptiles and amphibians most active in Idaho?
June is the busiest month in Idaho, with 22 species at peak activity. At least half of the area's species are active from April through October.
What reptiles and amphibians live in Idaho?
24 species have enough iNaturalist records to show here: 7 snakes, 7 lizards, 6 frogs and toads, 2 turtles, and 2 salamanders. The most-reported are the Western Terrestrial Garter Snake, Gopher Snake, and Western Fence Lizard.
Are there venomous snakes in Idaho?
Yes. The Western Rattlesnake lives here. Don't handle them.
Which reptiles and amphibians in Idaho 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.