Illinois
Snakes in Adams County
7 species have been documented here, 1 of them venomous.
Venomous snakes in Adams 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 Adams County
Common Watersnake
Nerodia sipedon
Harmless
Gray Ratsnake
Pantherophis spiloides
Harmless
Common Garter Snake
Thamnophis sirtalis
Harmless
DeKay's Brownsnake
Storeria dekayi
Harmless
North American Racer
Coluber constrictor
Harmless
Eastern Hognose Snake
Heterodon platirhinos
Harmless
Timber Rattlesnake
Crotalus horridus
Venomous
Compiled from verified GBIF & iNaturalist observations. Informational only.
Snakes in Adams County: FAQ
- Are there venomous snakes in Adams County, Illinois?
- Yes. 1 venomous snake species has verified records in Adams County, Illinois, including Timber Rattlesnake. Most snakes in Adams County, Illinois, however, are harmless.
- How many snake species live in Adams County, Illinois?
- 7 snake species have verified records in Adams County, Illinois, of which 1 is venomous.
- What is the most commonly seen snake in Adams County, Illinois?
- The Common Watersnake is the most frequently reported snake in Adams County, Illinois, based on verified wildlife observations.
- What should I do if I see a venomous snake in Adams County, Illinois?
- Keep your distance and do not try to catch or kill it. Most bites happen when people handle or corner a snake. If someone is bitten, contact local emergency services or poison control immediately.