Iowa
Snakes in Johnson County
12 species have been documented here, 1 of them venomous.
Venomous snakes in Johnson 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 Johnson County
Common Garter Snake
Thamnophis sirtalis
Harmless
DeKay's Brownsnake
Storeria dekayi
Harmless
Western Foxsnake
Pantherophis ramspotti
Harmless
Common Watersnake
Nerodia sipedon
Harmless
Plains Garter Snake
Thamnophis radix
Harmless
Eastern Milksnake
Lampropeltis triangulum
Harmless
Gopher Snake
Pituophis catenifer
Harmless
North American Racer
Coluber constrictor
Harmless
Smooth Greensnake
Opheodrys vernalis
Harmless
Eastern Hognose Snake
Heterodon platirhinos
Harmless
Timber Rattlesnake
Crotalus horridus
Venomous
Eastern Foxsnake
Pantherophis vulpinus
Harmless
Compiled from verified GBIF & iNaturalist observations. Informational only.
Snakes in Johnson County: FAQ
- Are there venomous snakes in Johnson County, Iowa?
- Yes. 1 venomous snake species has verified records in Johnson County, Iowa, including Timber Rattlesnake. Most snakes in Johnson County, Iowa, however, are harmless.
- How many snake species live in Johnson County, Iowa?
- 10+ snake species have verified records in Johnson County, Iowa, of which 1 is venomous.
- What is the most commonly seen snake in Johnson County, Iowa?
- The Common Garter Snake is the most frequently reported snake in Johnson County, Iowa, based on verified wildlife observations.
- What should I do if I see a venomous snake in Johnson County, Iowa?
- 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.