9 Types of Snakes in New Hampshire
New Hampshire is home to 11 snake species, but only the timber rattlesnake is venomous. Most sightings involve garter snakes, milk snakes, or northern water snakes. Start your search in rocky outcrops, forest edges, and near wetlands. This guide covers the types, key field marks, and best times to spot them.
By Tim, founder of Easy Street Markets. I maintain the wildlife database and verify every animal and source myself. Updated June 6, 2026.
Verified species, source iNaturalist
9 types of snakes recorded in New Hampshire
9 snake species have a verified observation record in New Hampshire across snakes (suborder Serpentes), each with at least 10 confirmed sightings. The full list, ranked by how often each is recorded, is below.
1
2
3
4
5
6
7
8
9
Plus 2 more recorded only rarely (fewer than 10 verified sightings). Counts from verified iNaturalist observations. Photos by iNaturalist observers, reused under the licence each observer chose.
New Hampshire is home to 11 snake species, but only the timber rattlesnake is venomous. Most sightings involve garter snakes, milk snakes, or northern water snakes. Start your search in rocky outcrops, forest edges, and near wetlands. This guide covers the types, key field marks, and best times to spot them.
What are the most common snakes in New Hampshire?
The most frequently encountered snakes in New Hampshire are the eastern garter snake, common garter snake (Thamnophis sirtalis), northern water snake (Nerodia sipedon), and eastern milk snake (Lampropeltis triangulum). Garter snakes are often found in gardens, fields, and forest edges. Northern water snakes prefer ponds and streams. Milk snakes are secretive but turn up under logs or in old barns. For a complete list, visit oursnake identification hub.
How can you tell a garter snake from a ribbon snake?
Garter snakes and ribbon snakes can be confused. Look at the jaw: ribbon snakes have a distinct white preocular scale (a white mark in front of the eye), while garter snakes do not. Ribbon snakes are also more slender and have a tail that makes up about one-third of their total length. Both have three stripes along the body, but ribbon snakes often have brighter, more distinct stripes. For more on lookalikes, check ourNew Hampshire wildlife page.
Where in New Hampshire are you most likely to see snakes?
Snakes in New Hampshire are most common in the southern and central parts of the state, especially in rocky areas, abandoned fields, and along stream corridors. The Monadnock Region, Lake Sunapee area, and the Connecticut River Valley are good starting points. Timber rattlesnakes are extremely rare and only found in a few remote, rocky ridges in the southwest. Always keep a respectful distance.
See ourstate animal guidefor the next step.
When is the best time of year for snake sightings in New Hampshire?
Snakes are active from April to October, with peak sightings in May and June during spring emergence and again in September as they bask before hibernation. Midday sun on cool days is ideal. Early morning and late afternoon are best in summer when snakes avoid heat. Winter sightings are unlikely unless you find a hibernaculum (communal den) in a rocky crevice.
How do you tell a milk snake from a northern water snake?
Milk snakes and northern water snakes both have blotched patterns, but their behavior gives them away. Water snakes are almost always near water and will dive or flee when disturbed. Milk snakes are found under cover in fields or forests. Pattern-wise, milk snakes have red or brown blotches bordered by black against a gray or tan background; water snakes have wider, irregular bands that darken with age. The belly of a water snake has crescent-shaped marks; a milk snake's belly has a checkerboard pattern.
What should you do if you encounter a timber rattlesnake?
Timber rattlesnakes are the only venomous snake in New Hampshire. They are shy and will usually retreat if given space. If you see one, stop, back away slowly, and give it a wide berth. Do not attempt to handle or kill the snake; it is protected by state law. Report sightings to New Hampshire Fish and Game. For safety tips and more on NH snakes, visit oursnake identification hub.
Show off your snake spotting with these snake-themed T-shirts
After a day in the field, wear your interest with pride. Here are some snake-themed tees for anyone who enjoys spotting these reptiles.
Rattlesnake Graphic T-Shirt
A bold design featuring a rattlesnake coil. Great for starting conversations about New Hampshire's only venomous species.Check Price and Availability
Green Viper Snake T-Shirt
While green vipers aren't native to New Hampshire, this tee works for anyone who admires exotic species.Check Price and Availability
Retro Cute Snake T-Shirt
A playful option for snake lovers of all ages. Soft cotton, a vintage feel.Check Price and Availability
Browse more snake designs at theEasy Street Markets T-shirt collection.
Are there venomous snakes in New Hampshire?
Only one venomous snake lives in New Hampshire: the timber rattlesnake (Crotalus horridus). It is state endangered and found only in a few remote areas in the southwestern part of the state. Bites are extremely rare. There are no water moccasins or copperheads in New Hampshire. If you see a snake that looks like a copperhead, it's likely a harmless milk snake.
What does a timber rattlesnake look like?
Timber rattlesnakes are heavy-bodied, 3 to 5 feet long, with a distinct rattle at the tail. They have a yellow or brown base color with dark V-shaped crossbands. The head is broad and triangular, with a dark stripe from the eye to the jaw. Young have a yellow-tipped tail that fades with age. Always look for the rattle, but rely on pattern and behavior for safe identification.
See ourtour planning ideasfor the next step.
Gear and field guides
Frequently asked questions
What are the most common snakes in New Hampshire?+
The most frequently encountered snakes in New Hampshire are the eastern garter snake, common garter snake (Thamnophis sirtalis), northern water snake (Nerodia sipedon), and eastern milk snake (Lampropeltis triangulum). Garter snakes are often found in gardens, fields, and forest edges. Northern water snakes prefer ponds and streams. Milk snakes are secretive but turn up under logs or in old barns. For a complete list, visit oursnake identification hub.
How can you tell a garter snake from a ribbon snake?+
Garter snakes and ribbon snakes can be confused. Look at the jaw: ribbon snakes have a distinct white preocular scale (a white mark in front of the eye), while garter snakes do not. Ribbon snakes are also more slender and have a tail that makes up about one-third of their total length. Both have three stripes along the body, but ribbon snakes often have brighter, more distinct stripes. For more on lookalikes, check ourNew Hampshire wildlife page.
Where in New Hampshire are you most likely to see snakes?+
Snakes in New Hampshire are most common in the southern and central parts of the state, especially in rocky areas, abandoned fields, and along stream corridors. The Monadnock Region, Lake Sunapee area, and the Connecticut River Valley are good starting points. Timber rattlesnakes are extremely rare and only found in a few remote, rocky ridges in the southwest. Always keep a respectful distance. See ourstate animal guidefor the next step.
When is the best time of year for snake sightings in New Hampshire?+
Snakes are active from April to October, with peak sightings in May and June during spring emergence and again in September as they bask before hibernation. Midday sun on cool days is ideal. Early morning and late afternoon are best in summer when snakes avoid heat. Winter sightings are unlikely unless you find a hibernaculum (communal den) in a rocky crevice.
How do you tell a milk snake from a northern water snake?+
Milk snakes and northern water snakes both have blotched patterns, but their behavior gives them away. Water snakes are almost always near water and will dive or flee when disturbed. Milk snakes are found under cover in fields or forests. Pattern-wise, milk snakes have red or brown blotches bordered by black against a gray or tan background; water snakes have wider, irregular bands that darken with age. The belly of a water snake has crescent-shaped marks; a milk snake's belly has a checkerboard pattern.
What should you do if you encounter a timber rattlesnake?+
Timber rattlesnakes are the only venomous snake in New Hampshire. They are shy and will usually retreat if given space. If you see one, stop, back away slowly, and give it a wide berth. Do not attempt to handle or kill the snake; it is protected by state law. Report sightings to New Hampshire Fish and Game. For safety tips and more on NH snakes, visit oursnake identification hub.
Are there venomous snakes in New Hampshire?+
Only one venomous snake lives in New Hampshire: the timber rattlesnake (Crotalus horridus). It is state endangered and found only in a few remote areas in the southwestern part of the state. Bites are extremely rare. There are no water moccasins or copperheads in New Hampshire. If you see a snake that looks like a copperhead, it's likely a harmless milk snake.
What does a timber rattlesnake look like?+
Timber rattlesnakes are heavy-bodied, 3 to 5 feet long, with a distinct rattle at the tail. They have a yellow or brown base color with dark V-shaped crossbands. The head is broad and triangular, with a dark stripe from the eye to the jaw. Young have a yellow-tipped tail that fades with age. Always look for the rattle, but rely on pattern and behavior for safe identification. See ourtour planning ideasfor the next step.
Keep exploring
More places to see snake
More wildlife in New Hampshire
Common questions about snakes