3 Types of WATER Snakes Found in New Hampshire! (2024)

What kinds of water snakes can you find in New Hampshire?

water snakes in New Hampshire

Is it just me, or do you also find water snakes fascinating? There’s something about the way they move across the water that is incredibly interesting. Whenever I am near a pond, marsh, or other body of water, I make sure to look for any water snakes moving about.

Today, you are going to learn about 3 water snakes that live in New Hampshire.

The species below are considered either aquatic or semi-aquatic, which means that it’s very likely that you will see them actively swimming or extremely close to water, such as sunning themselves on a bank.


#1. Northern Water Snake

  • Nerodia sipedon sipedon

water snakes in Vermont

Identifying Characteristics:

  • Adults range from 24 to 55 inches in length.
  • Coloration is pale grey to dark brown with reddish-brown to black bands.
  • Large adults become darker with age and appear almost plain black or dark brown.
  • Females tend to be larger than males, and coloration is most vivid in juvenile and wet individuals.

This water snake can be found in southeast New Hampshire!

Northern Watersnakes prefer slow-moving or standing water such as ponds, lakes, vernal pools, marshes, and slow-moving rivers and streams. They’re most often seen basking on rocks or logs in or near the water.

Common Watersnake Range Map (Northern Water Snakes are a subspecies)

common watersnake range map

Credit: Virginia Herpetological Society

These water snakes primarily feed on fish and amphibians by hunting during the day along the water’s edge and shallow water. They grab their prey and quickly swallow while it’s still alive!

When disturbed, Northern Watersnakes flee into the water to escape. However, if grabbed or captured, they’re quick to defend themselves. They will release a foul-smelling musk from glands near the base of their tale, flatten their body, and strike the attacker.

While non-venomous, they can deliver a painful bite!

Their saliva contains a mild anticoagulant that can cause bites to bleed, making the injury appear worse. These important defense mechanisms help water snakes survive predators such as raccoons, snapping turtles, foxes, opossums, other snakes, and birds of prey.


#2. Eastern Ribbon Snake

  • Thamnophis saurita

eastern or common ribbon snake

Identifying Characteristics:

  • Adults typically range from 18 to 26 inches in length. A slender snake with a long tail!
  • Coloration is brown to nearly black with three bright yellow to cream stripes; one down the back and one down each side.
  • Snout and entire head are brownish, lips and underneath head are white.

Did you see a long, slender snake in southern New Hampshire near freshwater?

If so, it was probably an Eastern Ribbon Snake!

This species is semi-aquatic and RARELY found far from a source of water. Look for them in a wide variety of habitats, including marshes, grassy floodplains, streams, ditches with grass, wet areas in meadows, and woodlands adjacent to wetlands. Ribbon snakes are even found in suburban areas that match these conditions.

eastern ribbon snake range map

You might spot these snakes basking on branches of trees, bushes, or grasses overhanging the water. They typically hunt in the water and prey on amphibians, fish, and invertebrates.

When disturbed, these snakes quickly flee into water, grass, or brushy areas. If caught, they are not aggressive and rarely bite. But you can expect them to defecate and spray musk onto your hands. In the wild, Eastern Ribbon Snakes rely on blending into their surroundings to escape predators.


#3. Maritime Garter Snake

  • Thamnophis sirtalis pallidulus

maritime gartersnake - species of water snake in New Hampshire

Identifying Characteristics:

  • Adults can reach 40 inches in length!
  • Coloration varies but is typically dark green, brown, or black. The stripes that are common on other garter snake species are missing or poorly developed.
  • Features a yellowish chin, upper jaw, and belly. Some individuals may display a checkered or speckled patterning on the back.
  • Subspecies of the Common Garter Snake.

Look for these snakes in New Hampshire, basking in the sun in grassy areas near freshwater.

In fact, they are typically the snake species that people come across the most. They’re well-adapted to living around people and can often be found in city parks, farmland, cemeteries, and suburban lawns and gardens. Though not required, they prefer grassy environments near freshwater sources such as ponds, marshes, lakes, ditches, and streams.

maritime garter snake range map

To survive the harsh northern winters in New Hampshire, these garter snakes hibernate below the frost line. They’ll utilize mammal and crayfish burrows, rock crevices, underground cavities, ant mounds, and manmade structures such as foundations. Interestingly, they often hibernate communally with other snakes!

This species isn’t considered threatened and can live to be TWENTY years old! They’re relatively common and can tolerate moderately disturbed human habitats well. However, populations near roads frequently have high road mortality rates.


Do you need additional help identifying a water snake in New Hampshire?

Try this field guide!


Which of these water snakes have you seen in New Hampshire?

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