Common Garter Snake - Wikipedia

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The subspecific name fitchi is in honor of the American herpetologist Henry Sheldon Fitch.[6]

The subspecific name pickeringii is in honor of the American naturalist Charles E. Pickering.[7]

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Current scientific classification recognizes 12 subspecies (ordered by date):[8]

Image	Subspecies	Distribution
	T. s. sirtalis (Linnaeus, 1758) – eastern garter snake	eastern North America
	T. s. parietalis (Say, 1823) – red-sided garter snake	as far north as Fort Smith, Northwest Territories, and as far south as the Oklahoma-Texas border
	T. s. infernalis (Blainville, 1835) – California red-sided garter snake	California coast
	T. s. concinnus (Hallowell, 1852) – red-spotted garter snake	northwestern Oregon and southwestern Washington
	T. s. dorsalis (Baird & Girard, 1853) – New Mexico garter snake	Mexico and southern New Mexico.
	T. s. pickeringii (Baird & Girard, 1853) – Puget Sound garter snake	Northwestern Washington, Vancouver Island and the southwestern British Columbia
	T. s. tetrataenia (Cope, 1875) – San Francisco garter snake (endangered)	San Mateo County, California
	T. s. semifasciatus (Cope, 1892) – Chicago garter snake	Chicago, Illinois
	T. s. pallidulus Allen, 1899 – maritime garter snake	northeastern New England, Quebec, and the Maritime provinces.
	T. s. annectens B.C. Brown, 1950 – Texas garter snake	Texas, Oklahoma and Kansas
	T. s. fitchi Fox, 1951 – valley garter snake	Rocky Mountains and interior ranges
	T. s. similis Rossman, 1965 – blue-striped garter snake	northwestern peninsular Florida