Month by month

What Reptiles and Amphibians Are Out in Wisconsin in September

27 reptiles and amphibians are active in Wisconsin in September, and 21 are at peak. Peak species include the American Toad, Green Frog, Common Garter Snake, and Northern Leopard Frog.

Counted from iNaturalist research-grade observations recorded inside Wisconsin. Seasons shift across the state, so for a closer match, pick your ecoregion.

Full 12-month Wisconsin calendar Pick your ecoregion

Species 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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At peak in September 21

Snakes

peak

SnakesCommon Garter SnakeThamnophis sirtalis

peak

SnakesCommon WatersnakeNerodia sipedon

peak

SnakesDeKay's BrownsnakeStoreria dekayi

peak

SnakesEastern FoxsnakePantherophis vulpinus

peak

SnakesEastern Hognose SnakeHeterodon platirhinos

peak

SnakesEastern MilksnakeLampropeltis triangulum

peak

SnakesRed-bellied SnakeStoreria occipitomaculata

peak

SnakesRing-necked SnakeDiadophis punctatus

peak

SnakesSmooth GreensnakeOpheodrys vernalis

Frogs and Toads

peak

Frogs and ToadsAmerican BullfrogLithobates catesbeianus

peak

Frogs and ToadsAmerican ToadAnaxyrus americanus

peak

Frogs and ToadsGreen FrogLithobates clamitans

peak

Frogs and ToadsNorthern Leopard FrogLithobates pipiens

peak

Frogs and ToadsPickerel FrogLithobates palustris

peak

Frogs and ToadsSpring PeeperPseudacris crucifer

peak

Frogs and ToadsWood FrogLithobates sylvaticus

Salamanders

peak

SalamandersBlue-spotted SalamanderAmbystoma laterale

peak

SalamandersEastern NewtNotophthalmus viridescens

peak

SalamandersEastern Red-backed SalamanderPlethodon cinereus

peak

SalamandersEastern Tiger SalamanderAmbystoma tigrinum

peak

SalamandersSpotted SalamanderAmbystoma maculatum

Shoulder season in September 6

Lizards

shoulder

LizardsCommon Five-lined SkinkPlestiodon fasciatus

Turtles

shoulder

TurtlesCommon Snapping TurtleChelydra serpentina

shoulder

TurtlesNorthern Map TurtleGraptemys geographica

shoulder

TurtlesPainted TurtleChrysemys picta

shoulder

TurtlesSpiny SoftshellApalone spinifera

Frogs and Toads

shoulder

Frogs and ToadsGray TreefrogDryophytes versicolor

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.

Wisconsin in September

What reptiles and amphibians are out in Wisconsin in September?

27 reptiles and amphibians are active in Wisconsin in September, and 21 are at peak. Peak species include the American Toad, Green Frog, Common Garter Snake, and Northern Leopard Frog.

Are venomous snakes active in Wisconsin in September?

No venomous snakes on this list are active in Wisconsin in September.