Snakes in Illinois

Illinois has around fifty snake species, most of which live in the southern portion of the state, comparatively warmer than the northern region. Only two of the four venomous snakes – the eastern massasauga and timber rattlesnake live in the north of Illinois. The massasauga living in swamps and marshes is endangered here. The Illinois Endangered Species Protection Board also enlists other species here threatened: the Kirtland’s snake, plains hognose snake, and eastern coachwhip.

Snakes in Illinois (IL)
Water SnakesNorthern CottonmouthCommon Water Snake
Midland Water Snake
Mississippi Green Water Snake Copperbelly Water Snake Banded Water Snake Diamondback Water Snake Plain-bellied Water Snake
RattlesnakesTimber Rattlesnake
Eastern Massasauga
Pit VipersEastern Copperhead
KingsnakesPrairie Kingsnake
Speckled Kingsnake
Yellow-bellied Kingsnake
Eastern Kingsnake
Black Kingsnake
Eastern Milksnake
Red Milksnake
Garter SnakesCommon Garter Snake
Chicago Garter Snake
Plains Garter Snake
Eastern Ribbon Snake
Northern Ribbon Snake
Western Ribbon Snake
Whip SnakesEastern Coachwhip
Hognose SnakesPlains Hognose Snake
Dusty Hognose Snake
Eastern Hognose Snake
Rat SnakesGreat Plains Rat Snake
Gray Ratsnake
Black Rat Snake
LiodytesQueen Snake
Graham’s Crayfish Snake
PituophisNorthern Pine Snake
PantherophisEastern Fox Snake
CarphophisMidwestern Worm Snake
TantillaFlat-headed Snake
Pituophis Gopher Snake Bullsnake
VirginiaWestern Smooth Earth Snake
Storeria DeKay’s Brownsnake
Northern Redbelly Snake
Opheodrys Rough Green Snake
Smooth Green Snake
Diadophis Ringneck Snake
Northern Ringneck Snake
Prairie Ringneck Snake
TropidoclonionNorthern Lined Snake
CemophoraNorthern Scarlet Snake
ColuberSouthern Black Racer
Blue Racer
ClonophisKirtland’s Snake
FaranciaWestern Mud Snake

Snakes by Colors and Patterns

Black Snakes: Southern Black Racer, Black Rat Snake, Black Kingsnake

Brown Snakes: DeKay’s Brownsnake, Common Garter Snake

Snakes by Regions

Snakes in Northern Illinois: Common Watersnake, Western Hognose Snake, Plain-bellied Watersnake, Timber Rattlesnake

Snakes in Southern Illinois: Mississippi Green Water Snake,Banded Water Snake,Northern Cottonmouth, Eastern Copperhead

Snakes in Central Illinois: Northern Cottonmouth, Plains Hognose Snake

Quick Information

Largest Snake: Gopher Snake

Most  Venomous Snakes: Timber Rattlesnake, Northern Cottonmouth