Timber Rattlesnake (Crotalus horridus)


Description: 44 - 50 inches. Timber Rattlesnakes may be a brown, tan, gold, or gray, with black bands or chevrons down the length of the body. The head is shaped like a spade, and the eyes have vertical, cat-like pupils. There is usually a rusty brown stripe running down the center of the back, and the tails is usually black with a velvet like appearance and a light colored rattle on the end.

Similar Species: Prairie Rattlesnakes and Eastern Massasauga Rattlesnakes do not have black tails. Many non-venomous species of snakes in Iowa will wag their tail against grass and other ground debris to produce a rattle-like sound, but rattlesnakes will hold their tails off the ground while rattling them. All non-venomous snakes in Iowa have round pupils.

Age in years of Most Recent Record
75+ 70 65 60 55 50 45 40 35 30 25 20 15 10 5

This map is generated from data provided by the Drake University Biodiversity Center, observations from HerpMapper.org, the Iowa DNR Natural Areas Inventory, as well as other sources. Please help us keep it up to date by reporting your sightings to HerpMapper.