Iowa
Snakes in Madison County
15 species have been documented here, 1 of them venomous.
Venomous snakes in Madison 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 Madison County

Timber Rattlesnake
Crotalus horridus
Venomous

Eastern Milksnake
Lampropeltis triangulum
Harmless

Common Garter Snake
Thamnophis sirtalis
Harmless

Common Watersnake
Nerodia sipedon
Harmless

Western Ratsnake
Pantherophis obsoletus
Harmless

North American Racer
Coluber constrictor
Harmless

DeKay's Brownsnake
Storeria dekayi
Harmless

Ring-necked Snake
Diadophis punctatus
Harmless

Western Foxsnake
Pantherophis ramspotti
Harmless

Pine Snake
Pituophis melanoleucus
Harmless

Eastern Hognose Snake
Heterodon platirhinos
Harmless

Smooth Earthsnake
Virginia valeriae
Harmless

Lined Snake
Tropidoclonion lineatum
Harmless

Gopher Snake
Pituophis catenifer
Harmless

Western Worm Snake
Carphophis vermis
Harmless
Compiled from verified GBIF & iNaturalist observations. Informational only.