← Herp Calendar map

Snakes

Plain-bellied Watersnake

Nerodia erythrogaster

Across the regions where it's common, the Plain-bellied Watersnake peaks from March to July.

Shows up in 11 ecoregions and 16 states

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.

Leave a tip

Snakes

Plain-bellied Watersnake

Nerodia erythrogaster

Look, don't take. Many states regulate collecting reptiles and amphibians. Photograph it, log it on iNaturalist and leave it where you found it.

Description

Nerodia erythrogaster, also known as the plain-bellied water snake or plainbelly water snake, is a common species of semi-aquatic, non-venomous colubrid snake endemic to the United States. Some snakes display a thin, white line between the pale belly and their darker top scales.Wikipedia ↗

Habitat

Plain-bellied water snakes are found in every southeastern state of the U.S., except for the higher elevations in the Appalachian Mountains (thus excluding them from eastern Tennessee and western North Carolina). Nerodia erythrogaster flavigaster is found in Alabama, northwestern Florida, Mississippi, Louisiana, eastern Texas, southeastern Oklahoma, Arkansas and areas surrounding the junction between the borders of Kentucky, Illinois and Missouri.Wikipedia ↗Animal Diversity Web ↗

When it's active

Plain-bellied water snakes are active in the warmest months of the year. They hibernate during the coldest months of the winter.Wikipedia ↗
Mila Turov · CC BY 4.0

Often mistaken for

Northern Cottonmouth, Florida CottonmouthMany scientists dislike the use of the term water moccasin since it can lead to confusion between the venomous cottonmouth and nonvenomous water snakes. Wikipedia ↗Nerodia fasciata is often mistaken for venomous cottonmouths (Agkistrodon piscivorous) despite the differences in their physical appearance. Animal Diversity Web ↗Cottonmouths vs. watersnakes →

About the Plain-bellied Watersnake

When is the Plain-bellied Watersnake most active?

Across the regions where it's common, the Plain-bellied Watersnake peaks from March to July.

Where does the Plain-bellied Watersnake live?

It has enough records to show in 11 ecoregions and 16 states, including Alabama, Arkansas, Florida, and Georgia.

What does the Plain-bellied Watersnake look like?

It's often confused with the Northern Cottonmouth and Florida Cottonmouth.