 Found in northwestern and north-central Arizona along both rims and the floor of the Grand Canyon and adjacent areas, and North into Utah on the Kaiparowits Plateau between the Escalante River and Paria River Drainages of Kane and Garfield Counties, Utah.The snake is found in a variety of habitats, including grassland, Great Basin Desert scrubland, bottoms in the Grand Canyon, talus and cliff slopes, rolling hills and bajadas in pinion-juniper woodland, and pine forests.It is primarily diurnal but can be active around the clock when conditions are favorable.