The West Coast garter snake (Thamnophis validus ) is a species of snake in the family Colubridae. The species is endemic to Mexico. Four subspecies are recognized.
The subspecific name isabelleae is in honor of the American wildlife artist Isabelle Hunt Conant, the wife of the American herpetologist Roger Conant.
T. validus is found in the Mexican states of Baja California Sur, Chihuahua, Guerrero, Jalisco, and Sonora.
T. validus is viviparous.
