Illinois
Snakes in Mason County
12 species have been documented here, 1 of them venomous.
Venomous snakes in Mason County
Full guide & what to do if bitten →
Eastern MassasaugaSistrurus catenatusVenomousStout, dark-blotched body, nine large scales on the crown, and a small rattle.
Every snake recorded in Mason County
Common Garter Snake
Thamnophis sirtalis
Harmless
North American Racer
Coluber constrictor
Harmless
Gopher Snake
Pituophis catenifer
Harmless
Eastern Hognose Snake
Heterodon platirhinos
Harmless
Common Watersnake
Nerodia sipedon
Harmless
Eastern Massasauga
Sistrurus catenatus
Venomous
Plains Garter Snake
Thamnophis radix
Harmless
Eastern Foxsnake
Pantherophis vulpinus
Harmless
Prairie Kingsnake
Lampropeltis calligaster
Harmless
DeKay's Brownsnake
Storeria dekayi
Harmless
Gray Ratsnake
Pantherophis spiloides
Harmless
Diamondback Watersnake
Nerodia rhombifer
Harmless
Compiled from verified GBIF & iNaturalist observations. Informational only.
Snakes in Mason County: FAQ
- Are there venomous snakes in Mason County, Illinois?
- Yes. 1 venomous snake species has verified records in Mason County, Illinois, including Eastern Massasauga. Most snakes in Mason County, Illinois, however, are harmless.
- How many snake species live in Mason County, Illinois?
- 10+ snake species have verified records in Mason County, Illinois, of which 1 is venomous.
- What is the most commonly seen snake in Mason County, Illinois?
- The Common Garter Snake is the most frequently reported snake in Mason County, Illinois, based on verified wildlife observations.
- What should I do if I see a venomous snake in Mason 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.