Illinois
Snakes in Jersey County
18 species have been documented here, 2 of them venomous.
Venomous snakes in Jersey 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.
Timber RattlesnakeCrotalus horridusVenomousHeavy body, broad triangular head, vertical (cat-like) pupils, and a segmented keratin rattle at the tail tip.
Every snake recorded in Jersey County

Common Wormsnake
Carphophis amoenus
Harmless

Prairie Kingsnake
Lampropeltis calligaster
Harmless

Gray Ratsnake
Pantherophis spiloides
Harmless

Eastern Copperhead
Agkistrodon contortrix
Venomous

Eastern Milksnake
Lampropeltis triangulum
Harmless

Common Garter Snake
Thamnophis sirtalis
Harmless

Common Watersnake
Nerodia sipedon
Harmless

North American Racer
Coluber constrictor
Harmless

Western Ratsnake
Pantherophis obsoletus
Harmless

Ring-necked Snake
Diadophis punctatus
Harmless

Plain-bellied Watersnake
Nerodia erythrogaster
Harmless

Diamondback Watersnake
Nerodia rhombifer
Harmless

Timber Rattlesnake
Crotalus horridus
Venomous

DeKay's Brownsnake
Storeria dekayi
Harmless

Rough Greensnake
Opheodrys aestivus
Harmless

Western Ribbon Snake
Thamnophis proximus
Harmless

Red-bellied Snake
Storeria occipitomaculata
Harmless

Graham's Crawfish Snake
Regina grahamii
Harmless
Compiled from verified GBIF & iNaturalist observations. Informational only.