This species occurs through most of the United States, and ranges into southern Canada and northern and eastern Mexico, discontinuously southwards to Guatemala and Belize. It extends from southern British Columbia, southern Saskatchewan, Wisconsin, Michigan, southern Ontario, New York, and southern Maine southward in the United States to southern California, Arizona, New Mexico, Texas, the Gulf Coast, and southern Florida, and southward through northeastern, central, and southern Mexico to Guatemala and Belize (Wilson 1978, Lee 2000, Ernst and Ernst 2003, Stebbins 2003). Elevational range extends from sea level to about 2,550 m (8,300 feet). A record for Durango, Mexico, evidently is erroneous (Webb 2001).
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