Illinois
Snakes in Jo Daviess County
10 species have been documented here, 1 of them venomous.
Venomous snakes in Jo Daviess County
Full guide & what to do if bitten →
Timber RattlesnakeCrotalus horridusVenomousHeavy body, broad triangular head, vertical (cat-like) pupils, and a segmented keratin rattle at the tail tip.
Every snake recorded in Jo Daviess County
DeKay's Brownsnake
Storeria dekayi
Harmless
Eastern Milksnake
Lampropeltis triangulum
Harmless
Common Garter Snake
Thamnophis sirtalis
Harmless
Gray Ratsnake
Pantherophis spiloides
Harmless
Common Watersnake
Nerodia sipedon
Harmless
Gopher Snake
Pituophis catenifer
Harmless
Ring-necked Snake
Diadophis punctatus
Harmless
Western Ratsnake
Pantherophis obsoletus
Harmless
Diamondback Watersnake
Nerodia rhombifer
Harmless
Timber Rattlesnake
Crotalus horridus
Venomous
Compiled from verified GBIF & iNaturalist observations. Informational only.