That is the more typical ending to a rattlesnake story in Montana: an awkward scramble, a racing pulse, and a good anecdote for later. The Honest NumbersThe Rocky Mountain Poison and Drug Center, which handles poison exposure calls for Montana, Colorado, Nevada, and Hawaii, has tracked 153 reported rattlesnake bites in Montana since 2008. That zero-death record is not because rattlesnake venom is mild. Both are blood thinners, and rattlesnake venom already impairs clotting. 10 Montana Snake Species Montana is home to 10 snake species, including the venomous prairie rattlesnake.