Frogs and Toads of Wisconsin
There are 11 frog species found in Wisconsin. They are from 2 families, Ranidae – true frogs and Hylidae – tree frogs.
These two frogs are identical besides their calls and chromosome numbers. These tree frogs are also larger than the ones below. Also note that Gray Tree Frogs are not always gray and can be green.
Spring Peeper is a frog that most people have heard during the early spring. They can be distinguished from Boreal Chorus Frog and Cricket Frog with their x on their back.
Boreal Chorus Frog is very similar to the Spring Peeper but there is no x on its back but lines.
Northern Cricket Frog is an endangered species in Wisconsin. They have no x or stripes on their back which separates them for the Spring Peeper and Boreal Chorus Frog. They are found in the Southern half of the state.
The Green Frog is probably the most common frog in Wisconsin. Best way to tell them apart from other true frogs below is the dorsal ridge on its back does not go all the way down its back.
American Bullfrog is the largest frog in Wisconsin. They are very similar to Green Frogs but they don’t have a dorsal ridge down their back. It wraps around their tympanum.
The Wood Frog (Lithobates sylvaticus) is the easiest true frog to identify in Wisconsin. They are brown, silver, or red and they have dark “raccoon” eyes.
Mink Frog has a marbled look to it compared to the other frogs. They are listed as a special concern species in Wisconsin. They are also found in Northern Wisconsin.
The Pickeral Frog and Northern Leopard Frog look very similar to each other because of the spots but the Pickeral frog’s spots are more rectangular than the Northern Leopard Frog.
The American Toad is the only toad found in Wisconsin. It is found throughout the state.