Coast Garter Snake (Thamnophis elegans terrestris). Really beautiful coloration, possibly the prettiest I've ever seen.
San Mateo County, California.
Found under a board . Looks freshly molted . A very bright individual . Temperature about 56 degrees F. at the time of the observation .
Snake under a cedar
The western terrestrial garter snake (Thamnophis elegans) is a western North American species of colubrid snake. Seven subspecies are currently recognized.