Snakes in Monroe County

• 
  Eastern Copperhead

  Agkistrodon contortrix

  ▲ Venomous

  Heavy body, triangular head, vertical pupils, and a heat-sensing pit between each eye and nostril.

• 
  Timber Rattlesnake

  Crotalus horridus

  ▲ Venomous

  Heavy body, broad triangular head, vertical (cat-like) pupils, and a segmented keratin rattle at the tail tip.

Every snake recorded in Monroe County

Eastern Copperhead

Agkistrodon contortrix

▲ Venomous

Ring-necked Snake

Diadophis punctatus

Harmless

Common Garter Snake

Thamnophis sirtalis

Harmless

North American Racer

Coluber constrictor

Harmless

Gray Ratsnake

Pantherophis spiloides

Harmless

Eastern Milksnake

Lampropeltis triangulum

Harmless

Common Watersnake

Nerodia sipedon

Harmless

DeKay's Brownsnake

Storeria dekayi

Harmless

Western Ribbon Snake

Thamnophis proximus

Harmless

Common Wormsnake

Carphophis amoenus

Harmless

Eastern Hognose Snake

Heterodon platirhinos

Harmless

Western Ratsnake

Pantherophis obsoletus

Harmless

Plain-bellied Watersnake

Nerodia erythrogaster

Harmless

Timber Rattlesnake

Crotalus horridus

▲ Venomous

Red-bellied Snake

Storeria occipitomaculata

Harmless

Rough Greensnake

Opheodrys aestivus

Harmless

Black Kingsnake

Lampropeltis nigra

Harmless

Smooth Earthsnake

Virginia valeriae

Harmless

Prairie Kingsnake

Lampropeltis calligaster

Harmless

Compiled from verified GBIF & iNaturalist observations. Informational only.

Snakes in Monroe County: FAQ

Are there venomous snakes in Monroe County, Illinois?

Yes. 2 venomous snake species have verified records in Monroe County, Illinois, including Eastern Copperhead, Timber Rattlesnake. Most snakes in Monroe County, Illinois, however, are harmless.

How many snake species live in Monroe County, Illinois?

10+ snake species have verified records in Monroe County, Illinois, of which 2 are venomous.

What is the most commonly seen snake in Monroe County, Illinois?

The Eastern Copperhead is the most frequently reported snake in Monroe County, Illinois, based on verified wildlife observations.

What should I do if I see a venomous snake in Monroe 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.

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