Snakes in Pennsylvania: identification guide and best places to start
Snakes do show up in Pennsylvania, and the best first step is matching habitat, timing, and recent local conditions. Start with the state wildlife hub, compare likely cover and movement windows, use the animal facts page for field marks, and plan one realistic route before heading out.
By Tim, founder of Easy Street Markets. I maintain the wildlife database and verify every animal and source myself. Updated June 28, 2026.
Eastern Copperhead · Court Harding CC BY
Eastern Copperhead · Mila C. CC BY
Eastern Garter Snake · Mila C. CC BY
- 8
- species recorded
- 7
- GBIF records
- May, June, April
- peak months
Snakes are rare in Pennsylvania, so you might also want:
Verified species, source iNaturalist
19 types of snakes recorded in Pennsylvania
19 snake species have a verified observation record in Pennsylvania across snakes (suborder Serpentes), each with at least 10 confirmed sightings. The full list, ranked by how often each is recorded, is below.
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Also recorded in Pennsylvania
| # | Species | Scientific name | Records |
|---|---|---|---|
| 13 | Eastern Hognose SnakeNativeHeterodon platirhinos | Heterodon platirhinos | 237 |
| 14 | Smooth GreensnakeNativeOpheodrys vernalis | Opheodrys vernalis | 232 |
| 15 | Common Ribbon SnakeNativeThamnophis saurita | Thamnophis saurita | 102 |
| 16 | Common WormsnakeNativeCarphophis amoenus | Carphophis amoenus | 45 |
| 17 | Eastern MassasaugaNativeSistrurus catenatus | Sistrurus catenatus | 44 |
| 18 | Smooth EarthsnakeNativeVirginia valeriae | Virginia valeriae | 37 |
| 19 | Rough GreensnakeNativeOpheodrys aestivus | Opheodrys aestivus | 25 |
Plus 3 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.
Real sighting data, source iNaturalist
32,666 verified observations on iNaturalist of snake have been recorded in Pennsylvania, most often in May, June, April.
When snake are recorded in Pennsylvania
Snakes do show up in Pennsylvania, and the best first step is matching habitat, timing, and recent local conditions. Start with the state wildlife hub, compare likely cover and movement windows, use the animal facts page for field marks, and plan one realistic route before heading out.
What snakes are most common in Pennsylvania?
The most common snakes you'll encounter are the eastern gartersnake, northern watersnake, and eastern milksnake. Gartersnakes often turn up in gardens and backyards. Watersnakes stick to creeks and ponds. Milksnakes are usually found under logs or in old stone walls. Timber rattlesnakes and copperheads are less common but do appear in rocky, forested regions.
Where are you most likely to see snakes in Pennsylvania?
Your best odds are in places that offer cover and prey. Check along forest edges, near rock piles, stone walls, and around wetlands. I've spotted the most northern watersnakes along the Susquehanna River and its tributaries. Timber rattlesnakes favor the rocky ridges of the Appalachian Trail. Copperheads often blend into leaf litter on south-facing slopes. Even suburban backyards with tall grass and compost piles can attract gartersnakes.
What time of year are snakes most active in Pennsylvania?
Snakes emerge from brumation (winter dormancy) in April and are most active from May through September. Peak activity happens on warm, sunny days with temperatures between 70 and 85°F. Look for them basking on rocks or pavement in the morning, or crossing trails in the late afternoon. Humidity also matters: a day after rain brings frogs and prey, which draws snakes out.
See ourstate animal guidefor the next step.
How can you identify a venomous snake in Pennsylvania?
Pennsylvania has three venomous species: timber rattlesnake, eastern copperhead, and eastern massasauga (rare). The easiest ID cue is the head shape: venomous snakes have a broad, triangular head with a narrow neck. Their pupils are elliptical (cat-like), not round. Rattlesnakes have a rattle at the tail. Copperheads have hourglass-shaped crossbands that are darker on the edges. Non-venomous watersnakes have round pupils and a more slender head. Always keep a safe distance: the best ID is from several feet away.
What should you do if you encounter a snake in Pennsylvania?
Stop, stand still, and let the snake move away. Most snakes will retreat if given space. Do not try to handle or provoke it. If you're on a trail, step off the path and give a wide berth. Back away slowly if the snake coils or rattles. For pets, keep them on a short leash in snake-prone areas. If you're bitten, stay calm, remove jewelry near the bite, and get to a hospital immediately. Never cut or suck the wound.
What snakes are often mistaken for copperheads in Pennsylvania?
The eastern milksnake and northern watersnake are frequently misidentified as copperheads. Milksnakes have a similar blotched pattern but the blotches are not hourglass-shaped, and their heads are narrow. Northern watersnakes can have dark bands that look like copperhead markings, but they have round pupils and a more uniform belly. Look at the head shape and pupil to tell them apart. When in doubt, treat it as venomous and keep your distance.
How can you find and photograph snakes safely in Pennsylvania?
The best approach is slow walking and scanning ahead. Look for basking snakes on rocks, logs, or trail edges. Use a telephoto lens or zoom on your phone to get a safe frame. Never corner or chase a snake. Early morning (7-10 AM) on sunny days after a rain is prime time. State parks like Ricketts Glen, Forbes State Forest, and Michaux State Forest have good habitat. Always bring a buddy and let someone know your route.
Where can you find snake-themed apparel and gear?
If you want to wear your interest on your sleeve, check out oursnake t-shirtsfor practical, field-tested designs. Here are a few favorites:
Rattlesnake Graphic T-Shirt
A bold rattlesnake print that stands up to repeated washings. Great for hikes or casual wear.Check Price and Availability
Green Viper Snake T-Shirt
Features a striking viper illustration with a forest green background. Soft cotton blend.Check Price and Availability
Retro Cute Snake T-Shirt
A playful cartoon snake perfect for the lighter side of herping. Affordable and fun.Check Price and Availability
For more options, browse our full collection ofsnake gearandPennsylvania wildlife.
Do Pennsylvania snakes come into houses and how can you keep them out?
Snakes mostly stay outside, but they can slip through gaps under doors, around pipes, or in crawl spaces. To discourage them, seal cracks in foundations, install door sweeps, and keep vegetation trimmed away from your home. Remove rock piles and wood stacks near the foundation. If you find one inside, open an exterior door and give it an escape route. For persistent issues, contact a wildlife removal service.
See ourtour planning ideasfor the next step.
Gear and field guides
Plan your trip
Best time to see snake in Pennsylvania: May, June, April
See the month-by-month sighting calendar.
Plan your snake sighting in Pennsylvania
7 verified snake records have been logged in Pennsylvania. See the GBIF records.
Where to look in Pennsylvania
- Appalachian National Scenic Trail · Wildlife Watching, Birdwatching · Find hotels
- Captain John Smith Chesapeake National Historic Trail · Wildlife Watching, Birdwatching · Find hotels
- Chesapeake Bay · Wildlife Watching · Find hotels
- Delaware Water Gap National Recreation Area · Wildlife Watching, Birdwatching · Find hotels
- Fort Necessity National Battlefield · Wildlife Watching, Birdwatching · Find hotels
- Friendship Hill National Historic Site · Wildlife Watching, Birdwatching · Find hotels
Frequently asked questions
What snake species live in Pennsylvania?+
The most common snakes you'll encounter are the eastern gartersnake, northern watersnake, and eastern milksnake. Gartersnakes often turn up in gardens and backyards. Watersnakes stick to creeks and ponds. Milksnakes are usually found under logs or in old stone walls. Timber rattlesnakes and copperheads are less common but do appear in rocky, forested regions.
Where can you see snakes in Pennsylvania?+
The most common snakes you'll encounter are the eastern gartersnake, northern watersnake, and eastern milksnake. Gartersnakes often turn up in gardens and backyards. Watersnakes stick to creeks and ponds. Milksnakes are usually found under logs or in old stone walls. Timber rattlesnakes and copperheads are less common but do appear in rocky, forested regions.
When is the best time to see snakes in Pennsylvania?+
The most common snakes you'll encounter are the eastern gartersnake, northern watersnake, and eastern milksnake. Gartersnakes often turn up in gardens and backyards. Watersnakes stick to creeks and ponds. Milksnakes are usually found under logs or in old stone walls. Timber rattlesnakes and copperheads are less common but do appear in rocky, forested regions.
Keep exploring
More places to see snake
More wildlife in Pennsylvania
Common questions about snakes