Are there rattlesnakes in Missouri?

Yes, Missouri has three species of rattlesnake:Timber Rattlesnake (Crotalus horridus)

Western Pgymy Rattlesnake (Sistrurus miliarius streckeri)

Eastern Massasauga Rattlesnake (Sistrurus catenatus catenatus)

Yes there are rattle snakes in Missouri. I just saw one yesterday actually. The main rattler we have is the Timber Rattler. Around my house they live near the old coal mines the old rock quarry and along a line of bluffs that goes behind my house in northwest Missouri.