Are there cottonmouths in Pennsylvania?

Short answer
No

No. GBIF holds 1 isolated record of the cottonmouth from Pennsylvania, far from its range. That is most likely a captive animal or a mislabeled record.

The nearest populations are in Kentucky, Virginia.

Cottonmouth
Photo: kirk gardner, CC BY 4.0, via iNaturalist

Where the records come from

Open GBIF records by county.

Cottonmouths across the US

Alabama: lives hereAlaska: not hereArizona: not hereArkansas: lives hereCalifornia: not hereColorado: rare recordsConnecticut: not hereDelaware: not hereFlorida: lives hereGeorgia: lives hereHawaii: not hereIdaho: not hereIllinois: lives hereIndiana: rare recordsIowa: not hereKansas: rare recordsKentucky: lives hereLouisiana: lives hereMaine: not hereMaryland: rare recordsMassachusetts: not hereMichigan: not hereMinnesota: not hereMississippi: lives hereMissouri: lives hereMontana: not hereNebraska: not hereNevada: not hereNew Hampshire: not hereNew Jersey: not hereNew Mexico: not hereNew York: not hereNorth Carolina: lives hereNorth Dakota: not hereOhio: not hereOklahoma: lives hereOregon: not herePennsylvania: not hereRhode Island: not hereSouth Carolina: lives hereSouth Dakota: not hereTennessee: lives hereTexas: lives hereUtah: not hereVermont: not hereVirginia: lives hereWashington: not hereWest Virginia: not hereWisconsin: not hereWyoming: not here
Pennsylvania is outlined. Tap another state to see its answer.

How to recognize one

Cottonmouth Agkistrodon piscivorus

Dangerous. A bite is a medical emergency. Most snakes people call water moccasins outside its range are harmless water snakes.

Often mistaken for cottonmouths

Questions

Are there cottonmouths in Pennsylvania?

No. GBIF holds 1 isolated record of the cottonmouth from Pennsylvania, far from its range. That is most likely a captive animal or a mislabeled record.

Where are the nearest cottonmouths to Pennsylvania?

In Kentucky and Virginia.

What do cottonmouths look like?

Heavy, dark olive to black body; bands fade with age. Broad flat head with a dark stripe through the eye. Swims with the whole body high on the water.

More for Pennsylvania