Snake Species: Sistrurus spp., Pygmy rattlesnake and Massasauga
Distribution of Terrestrial Snakes in North America
Sistrurus catenatus
| Arizona | SE | |
| Minnesota, Iowa, Missouri | X | E Iowa, NE Missouri |
| New Mexico | X | |
| New York, Pennsylvania, New Jersey | X | NW New York and W Pensiyvania |
| Ontario | S | |
| Texas | W | |
| Utah, Colorado | E | Colorado only |
| Wisconsin, Illinois, Michigan, Indiana, Ohio | X | S Wisconsin, Illinois, N Indiana, Ohio |
Sistrurus miliarius
| Arkansas, Louisiana | X | |
| Florida | X | |
| Kentucky, Tennessee | SW | |
| Minnesota, Iowa, Missouri | S | Missouri only |
| Nebraska, Kansas, Oklahoma | X | Oklahoma only |
| North & South Carolina, Georgia, Alabama, Mississippi | X | |
| Texas | E |
Sistrurus tergeminus
| Minnesota, Iowa, Missouri | X | SW Iowa, NW Missouri |
| Nebraska, Kansas, Oklahoma | X | E Nebraska, Kansas, Oklahoma |
| Texas | X |