Ecoregion
Central California Valley Reptiles and Amphibians by Month
The Central Valley is mostly farmland now, so herps hang on along rivers, levees and parks. Western Fence Lizards and Pacific Chorus Frogs are the easy finds. Gopher Snakes cross roads in the spring. May is the busiest month. Pond Sliders and American Bullfrogs here are introduced.
19 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 Central California Valley, by group and month
| Group | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Snakes | 2 | 4 | 7 | 7 | 7 | 7 | 6 | 5 | 5 | 6 | 4 | 2 |
| Lizards | 4 | 4 | 4 | 5 | 6 | 6 | 6 | 6 | 5 | 4 | 4 | 3 |
| Turtles | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Frogs and Toads | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 |
| Salamanders | 2 | 2 | 2 | 2 | 1 | 1 |
Numbers = species active that month (at peak or just starting / winding down).
Keep Herp Calendar free
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.
14 species at peak or shoulder in September
peak
peak
peak
peak
peak
peak
peak
peak
peak
peak
shoulder
shoulder
shoulder
shoulderAbout Central California Valley
When are reptiles and amphibians most active in the Central California Valley?
May is the busiest month in the Central California Valley, with 16 species at peak activity. At least half of the area's species are active all year.
What reptiles and amphibians live in the Central California Valley?
19 species have enough iNaturalist records to show here: 7 snakes, 6 lizards, 3 frogs and toads, 2 salamanders, and 1 turtle. The most-reported are the Western Fence Lizard, Pond Slider, and Pacific Chorus Frog.
Are there venomous snakes in the Central California Valley?
Yes. The Western Rattlesnake lives here. Don't handle them.
Which reptiles and amphibians in the Central California Valley are introduced?
The Pond Slider, American Bullfrog, and Mediterranean House Gecko are 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.