State herp calendar
Reptiles and Amphibians of Oklahoma
Oklahoma runs from pine hills in the east to plains in the west. Pond Sliders and Three-toed Box Turtles are the most-reported herps. Snakes are the biggest group. May is the busiest month. Several venomous snakes live here, including the Northern Cottonmouth, Broad-banded Copperhead and Western Massasauga.
70 species8 ecoregions8 venomous
Search entire stateSpecies out across Oklahoma, by group and month
| Group | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Snakes | 6 | 26 | 28 | 29 | 26 | 24 | 24 | 24 | 23 | 12 | 2 | |
| Lizards | 1 | 5 | 9 | 9 | 8 | 8 | 8 | 8 | 7 | 7 | 4 | 1 |
| Turtles | 1 | 4 | 9 | 10 | 10 | 10 | 8 | 7 | 6 | 7 | 5 | 1 |
| Frogs and Toads | 1 | 5 | 10 | 14 | 14 | 13 | 11 | 10 | 9 | 7 | 5 | 2 |
| Salamanders | 2 | 3 | 5 | 4 | 4 | 4 | 2 | 1 | 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.
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Tap a region to see what's out
Ecoregions of Oklahoma
Seasons shift a lot between Oklahoma's ecoregions. Pick the one nearest you for a 12-month calendar of what's out.
Ouachita Mountains
58 speciesOak-pine ridges with box turtles, prairie lizards and a lot of snakes.
View calendar →Southern Plains
73 speciesCross timbers and prairie with spiny lizards, sliders and a long snake list.
View calendar →Central Great Plains
49 speciesPrairie, farm ponds and river bottoms with toads, turtles and collared lizards.
View calendar →Ozark Highlands
59 speciesKarst hills, springs and glades full of snakes, toads and box turtles.
View calendar →Southwestern Tablelands
36 speciesCanyons and breaks with prairie lizards, collared lizards and rattlesnakes.
View calendar →Piney Woods and Loess Hills
61 speciesPine forest and bottomlands with anoles, treefrogs, box turtles and cottonmouths.
View calendar →High Plains
24 speciesShortgrass prairie and playa lakes with plains toads and prairie rattlesnakes.
View calendar →Texas Blackland Prairies and Post Oak Savanna
71 speciesPrairie and post oak around the big Texas cities, with anoles, sliders and toads.
View calendar →Venomous here: Broad-banded Copperhead, Eastern Copperhead, Northern Cottonmouth, Prairie Rattlesnake, Pygmy Rattlesnake, Timber Rattlesnake, Western Diamond-backed Rattlesnake, Western Massasauga. Don't handle any snake you can't identify.
About Oklahoma
When are reptiles and amphibians most active in Oklahoma?
May is the busiest month in Oklahoma, with 62 species at peak activity. At least half of the area's species are active from March through October.
What reptiles and amphibians live in Oklahoma?
70 species have enough iNaturalist records to show here: 29 snakes, 15 frogs and toads, 10 turtles, 9 lizards, 6 salamanders, and 1 alligator. The most-reported are the Pond Slider, Three-toed Box Turtle, and Blanchard's Cricket Frog.
Are there venomous snakes in Oklahoma?
Yes. The Northern Cottonmouth, Broad-banded Copperhead, Western Diamond-backed Rattlesnake, Timber Rattlesnake, Pygmy Rattlesnake, Eastern Copperhead, Western Massasauga, and Prairie Rattlesnake live here. Don't handle them.
Which reptiles and amphibians in Oklahoma are introduced?
The Mediterranean House Gecko 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.