Geographic Range
Found in North America over much of the Great Plains the eastern foothills of the Rocky Mountains, and some intermontane valleys of the Rocky Mountains, from southwestern Canada south through the United States to northern Mexico. In Canada it occurs in Alberta and Saskatchewan; in the USA in eastern Oregon, eastern Washington, southern Idaho, most of Montana (where it is one of 10 snake species and the only venomous one), North Dakota, South Dakota, Wyoming, Nebraska, Colorado, Kansas, Oklahoma, Texas, New Mexico, extreme eastern Arizona, and in Mexico in northern Coahuila and northwestern Chihuahua. Its vertical range is from 100 metres (330 ft) near the Rio Grande River to over 2,775 metres (9,104 ft) elevation in Wyoming.
Wright and Wright (1957) and Klauber (1997) both mention Utah as within the range of this species, including maps showing it confined to the extreme southeastern part of the state.
The type locality is described as "the Upper Missouri ". An emendation was proposed by H.M. Smith and Taylor (1950) to "Gross, Boyd County, Nebraska."
Read more about this topic: Crotalus Viridis
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