State herp calendar
Reptiles and Amphibians of Wisconsin
Wisconsin is north woods, lakes and farmland. American Toads and Painted Turtles are the most-reported herps. Northern Leopard Frogs and Spring Peepers call in spring. May is the busiest month, and no venomous snakes made the list here.
30 species3 ecoregions
Search entire stateSpecies out across Wisconsin, by group and month
| Group | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Snakes | 1 | 5 | 10 | 11 | 11 | 10 | 9 | 9 | 8 | 3 | ||
| Lizards | 1 | 1 | 1 | 1 | 1 | |||||||
| Turtles | 1 | 2 | 4 | 4 | 4 | 4 | 4 | 4 | 2 | |||
| Frogs and Toads | 1 | 8 | 9 | 9 | 8 | 8 | 8 | 8 | 8 | 4 | ||
| Salamanders | 2 | 5 | 4 | 3 | 3 | 4 | 5 | 3 | 3 |
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 Wisconsin
Seasons shift a lot between Wisconsin's ecoregions. Pick the one nearest you for a 12-month calendar of what's out.
Upper Midwest Hardwood Forests
27 speciesHardwood forest and farm ponds with toads, painted turtles and leopard frogs.
View calendar →Northern Lakes and Forests
27 speciesNorth woods and lakes where frogs and turtles fit a short, busy summer.
View calendar →Corn Belt Midwest
37 speciesFarm country with ponds and parks full of toads, painted turtles and garter snakes.
View calendar →About Wisconsin
When are reptiles and amphibians most active in Wisconsin?
May is the busiest month in Wisconsin, with 25 species at peak activity. At least half of the area's species are active from March through October.
What reptiles and amphibians live in Wisconsin?
30 species have enough iNaturalist records to show here: 11 snakes, 9 frogs and toads, 5 salamanders, 4 turtles, and 1 lizard. The most-reported are the American Toad, Painted Turtle, and Green Frog.
Are there venomous snakes in Wisconsin?
No venomous snakes have enough records in Wisconsin to make this list.
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.