Illinois
Snakes in McHenry County
8 species have been documented here, and none are venomous.
Every snake recorded in McHenry County
Common Garter Snake
Thamnophis sirtalis
Harmless
DeKay's Brownsnake
Storeria dekayi
Harmless
Eastern Foxsnake
Pantherophis vulpinus
Harmless
Red-bellied Snake
Storeria occipitomaculata
Harmless
Common Watersnake
Nerodia sipedon
Harmless
Eastern Milksnake
Lampropeltis triangulum
Harmless
Smooth Greensnake
Opheodrys vernalis
Harmless
Plains Garter Snake
Thamnophis radix
Harmless
Compiled from verified GBIF & iNaturalist observations. Informational only.
Snakes in McHenry County: FAQ
- Are there venomous snakes in McHenry County, Illinois?
- No venomous snakes have verified records in McHenry County, Illinois. Every snake recorded here is harmless to humans, though any snake may bite defensively if handled.
- How many snake species live in McHenry County, Illinois?
- 8 snake species have verified records in McHenry County, Illinois.
- What is the most commonly seen snake in McHenry County, Illinois?
- The Common Garter Snake is the most frequently reported snake in McHenry County, Illinois, based on verified wildlife observations.