The species' range extends discontinuously from the Great Lakes region of the United States (east to parts of southern Ontario (Canada) and a few sites in New York) southwest through the central and southern Great Plains region to southeastern Arizona (see Herpetological Review 21: 41), Texas Gulf Coast, and northeastern Mexico (Coahuila and Nuevo Leon) (Seigel 1986, Ernst and Barbour 1989, Stebbins 2003, Campbell and Lamar 2004). Its elevational range extends from sea level up to around 2,100 m asl (6,890 feet) (Stebbins 2003).