| Subspecies | Taxon author | Common name | Geographic range |
|---|---|---|---|
| C. v. nuntius | Klauber, 1935 | Hopi rattlesnake | The United States from northeastern and north-central Arizona, from the New Mexican line to Cataract Creek, including the Little Colorado River basin, the southern section of the Apache Indian Reservation, the Hopi Reservation, and the Coconino Plateau from the southern rim of the Grand Canyon to U.S. Highway 66 in the south. |
| C. v. viridis | (Rafinesque, 1818) | prairie rattlesnake | North American Great Plains from the Rocky Mountains to long. 96° W. and from southern Canada to extreme northern Mexico, including southwestern Saskatchewan, southeastern Alberta, eastern Washington, Idaho in the Lemhi Valley, Montana east of the higher Rockies, southwestern North Dakota, west, central and extreme southeastern South Dakota, western Iowa, central and western Nebraska, Wyoming except for the Rockies, Colorado, central and western Kansas, Oklahoma, extreme southeastern Utah, northeastern Arizona, New Mexico, western and southwestern Texas, northeastern Sonora, northern Chihuahua, northern Coahuila. |
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