Illinois
Snakes in Jackson County
25 species have been documented here, 3 of them venomous.
Venomous snakes in Jackson County
Full guide & what to do if bitten →
Northern CottonmouthAgkistrodon piscivorusVenomousHeavy 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.
Eastern CopperheadAgkistrodon contortrixVenomousHeavy body, triangular head, vertical pupils, and a heat-sensing pit between each eye and nostril.
Every snake recorded in Jackson County

Northern Cottonmouth
Agkistrodon piscivorus
Venomous

Gray Ratsnake
Pantherophis spiloides
Harmless

Common Watersnake
Nerodia sipedon
Harmless

North American Racer
Coluber constrictor
Harmless

Rough Greensnake
Opheodrys aestivus
Harmless

Timber Rattlesnake
Crotalus horridus
Venomous

Eastern Copperhead
Agkistrodon contortrix
Venomous

Common Garter Snake
Thamnophis sirtalis
Harmless

DeKay's Brownsnake
Storeria dekayi
Harmless

Prairie Kingsnake
Lampropeltis calligaster
Harmless

Western Ribbon Snake
Thamnophis proximus
Harmless

Plain-bellied Watersnake
Nerodia erythrogaster
Harmless

Black Kingsnake
Lampropeltis nigra
Harmless

Eastern Milksnake
Lampropeltis triangulum
Harmless

Ring-necked Snake
Diadophis punctatus
Harmless

Western Ratsnake
Pantherophis obsoletus
Harmless

Red-bellied Snake
Storeria occipitomaculata
Harmless

Smooth Earthsnake
Virginia valeriae
Harmless

Diamondback Watersnake
Nerodia rhombifer
Harmless

Mississippi Green Watersnake
Nerodia cyclopion
Harmless

Common Wormsnake
Carphophis amoenus
Harmless

Eastern Hognose Snake
Heterodon platirhinos
Harmless

Speckled Kingsnake
Lampropeltis holbrooki
Harmless

Eastern Foxsnake
Pantherophis vulpinus
Harmless

Eastern Kingsnake
Lampropeltis getula
Harmless
Compiled from verified GBIF & iNaturalist observations. Informational only.