Common garter snakes are native to the Nearctic region only. They occur throughout much of North America, although they are largely absent from the arid southwestern United States. Common garter snakes are found throughout eastern North America from Florida to coastal Quebec, west to British Columbia, south into southern California east of the Sierras, and throughout the less arid areas of the southwest. Isolated populations occur on mountain ranges in New Mexico and northern Mexico (New Mexico garter snakes, Thamnophis_sirtalis_dorsalis). They are found as far south as the Gulf of Mexico in the eastern United States.
Biogeographic Regions: nearctic (Native )
- Conant, R., J. Collins. 1998. Peterson Field Guide to Reptiles and Amphibians of Eastern and Central North America. Boston: Houghton Mifflin.
- Stebbins, R. 1985. Peterson Field Guide to Western Reptiles and Amphibians. Boston: Houghton Mifflin.
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