Ecoregion
Eastern Cascades and Blue Mountains Reptiles and Amphibians by Month
Ponderosa pine and sagebrush cover the east side of the Cascades and the Blue Mountains. Western Fence Lizards and Common Sagebrush Lizards like the dry, sunny slopes. Gopher Snakes are common. Pacific Chorus Frogs call in spring. August is the busiest month, and the Western Rattlesnake lives here.
18 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 Eastern Cascades and Blue Mountains, by group and month
| Group | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Snakes | 2 | 6 | 6 | 6 | 6 | 6 | 6 | 5 | 2 | |||
| Lizards | 1 | 3 | 6 | 6 | 6 | 6 | 5 | 4 | 2 | |||
| Frogs and Toads | 1 | 1 | 3 | 5 | 5 | 5 | 5 | 3 | 1 | |||
| Salamanders | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
Numbers = species active that month (at peak or just starting / winding down).
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16 species at peak or shoulder in September
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shoulderAbout Eastern Cascades and Blue Mountains
When are reptiles and amphibians most active in the Eastern Cascades and Blue Mountains?
August is the busiest month in the Eastern Cascades and Blue Mountains, with 16 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 Eastern Cascades and Blue Mountains?
18 species have enough iNaturalist records to show here: 6 lizards, 6 snakes, 5 frogs and toads, and 1 salamander. The most-reported are the Western Fence Lizard, Pacific Chorus Frog, and Gopher Snake.
Are there venomous snakes in the Eastern Cascades and Blue Mountains?
Yes. The Western Rattlesnake lives here. Don't handle them.
Which reptiles and amphibians in the Eastern Cascades and Blue Mountains 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.