Illinois
Snakes in Saint Clair County
26 species have been documented here, 3 of them venomous.
Venomous snakes in Saint Clair 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.
Eastern MassasaugaSistrurus catenatusVenomousStout, dark-blotched body, nine large scales on the crown, and a small rattle.
Every snake recorded in Saint Clair County
Common Watersnake
Nerodia sipedon
Harmless
Common Garter Snake
Thamnophis sirtalis
Harmless
Gray Ratsnake
Pantherophis spiloides
Harmless
DeKay's Brownsnake
Storeria dekayi
Harmless
Plain-bellied Watersnake
Nerodia erythrogaster
Harmless
Graham's Crawfish Snake
Regina grahamii
Harmless
Western Ribbon Snake
Thamnophis proximus
Harmless
Diamondback Watersnake
Nerodia rhombifer
Harmless
Eastern Hognose Snake
Heterodon platirhinos
Harmless
Prairie Kingsnake
Lampropeltis calligaster
Harmless
Red-bellied Snake
Storeria occipitomaculata
Harmless
Eastern Milksnake
Lampropeltis triangulum
Harmless
Western Ratsnake
Pantherophis obsoletus
Harmless
North American Racer
Coluber constrictor
Harmless
Smooth Earthsnake
Virginia valeriae
Harmless
Ring-necked Snake
Diadophis punctatus
Harmless
Rough Greensnake
Opheodrys aestivus
Harmless
Eastern Copperhead
Agkistrodon contortrix
Venomous
Lined Snake
Tropidoclonion lineatum
Harmless
Timber Rattlesnake
Crotalus horridus
Venomous
Common Wormsnake
Carphophis amoenus
Harmless
Eastern Massasauga
Sistrurus catenatus
Venomous
Western Worm Snake
Carphophis vermis
Harmless
Eastern Kingsnake
Lampropeltis getula
Harmless
Flat-headed Snake
Tantilla gracilis
Harmless
Tantilla selmae
Harmless
Compiled from verified GBIF & iNaturalist observations. Informational only.