Know the dangerous ones
Venomous snakes in Johnson County, Iowa
3 venomous snake species have verified records in Johnson County. Learn to recognize each one, and know what to do if you are bitten.
Field entries
Crotalus horridus Timber RattlesnakeVenomousCrotalus horridus
How to identify
Heavy body, broad triangular head, vertical (cat-like) pupils, and a segmented keratin rattle at the tail tip.
Rarely seenFull profile →
Crotalus viridis Prairie RattlesnakeVenomousCrotalus viridis
How to identify
Heavy body, broad triangular head, vertical (cat-like) pupils, and a segmented keratin rattle at the tail tip.
Rarely seenFull profile →
Sistrurus catenatus Eastern MassasaugaVenomousSistrurus catenatus
How to identify
Stout, dark-blotched body, nine large scales on the crown, and a small rattle.
Rarely seenFull profile →
Looking for all snakes here, not just the venomous ones? See all snakes in Johnson County.