Pennsylvania
Snakes in Allegheny County
17 species have been documented here, 1 of them venomous.
Venomous snakes in Allegheny County
Full guide & what to do if bitten →
Eastern CopperheadAgkistrodon contortrixVenomousHeavy body, triangular head, vertical pupils, and a heat-sensing pit between each eye and nostril.
Every snake recorded in Allegheny County
Common Garter Snake
Thamnophis sirtalis
Harmless
Gray Ratsnake
Pantherophis spiloides
Harmless
Common Watersnake
Nerodia sipedon
Harmless
DeKay's Brownsnake
Storeria dekayi
Harmless
Queensnake
Regina septemvittata
Harmless
Eastern Milksnake
Lampropeltis triangulum
Harmless
Ring-necked Snake
Diadophis punctatus
Harmless
Eastern Copperhead
Agkistrodon contortrix
Venomous
Western Ratsnake
Pantherophis obsoletus
Harmless
Common Ribbon Snake
Thamnophis saurita
Harmless
North American Racer
Coluber constrictor
Harmless
Short-headed Garter Snake
Thamnophis brachystoma
Harmless
Kirtland's Snake
Clonophis kirtlandii
Harmless
Smooth Greensnake
Opheodrys vernalis
Harmless
Red-bellied Snake
Storeria occipitomaculata
Harmless
Eastern Hognose Snake
Heterodon platirhinos
Harmless
Red Cornsnake
Pantherophis guttatus
Harmless
Compiled from verified GBIF & iNaturalist observations. Informational only.
Snakes in Allegheny County: FAQ
- Are there venomous snakes in Allegheny County, Pennsylvania?
- Yes. 1 venomous snake species has verified records in Allegheny County, Pennsylvania, including Eastern Copperhead. Most snakes in Allegheny County, Pennsylvania, however, are harmless.
- How many snake species live in Allegheny County, Pennsylvania?
- 10+ snake species have verified records in Allegheny County, Pennsylvania, of which 1 is venomous.
- What is the most commonly seen snake in Allegheny County, Pennsylvania?
- The Common Garter Snake is the most frequently reported snake in Allegheny County, Pennsylvania, based on verified wildlife observations.
- What should I do if I see a venomous snake in Allegheny County, Pennsylvania?
- Keep your distance and do not try to catch or kill it. Most bites happen when people handle or corner a snake. If someone is bitten, contact local emergency services or poison control immediately.