California
Snakes in San Francisco County
18 species have been documented here, 2 of them venomous.
Venomous snakes in San Francisco County
Full guide & what to do if bitten →
Prairie RattlesnakeCrotalus viridisVenomousHeavy body, broad triangular head, vertical (cat-like) pupils, and a segmented keratin rattle at the tail tip.
Red Diamond RattlesnakeCrotalus ruberVenomousHeavy body, broad triangular head, vertical (cat-like) pupils, and a segmented keratin rattle at the tail tip.
Every snake recorded in San Francisco County
Western Terrestrial Garter Snake
Thamnophis elegans
Harmless
Gopher Snake
Pituophis catenifer
Harmless
Aquatic Garter Snake
Thamnophis atratus
Harmless
Ring-necked Snake
Diadophis punctatus
Harmless
North American Racer
Coluber constrictor
Harmless
Common Garter Snake
Thamnophis sirtalis
Harmless
Prairie Rattlesnake
Crotalus viridis
Venomous
California King Snake
Lampropeltis californiae
Harmless
Eastern Kingsnake
Lampropeltis getula
Harmless
Northern Rubber Boa
Charina bottae
Harmless
Lema's Ground Snake
Lygophis dilepis
Harmless
Sonora straminea
Harmless
Northwestern Garter Snake
Thamnophis ordinoides
Harmless
Red Diamond Rattlesnake
Crotalus ruber
Venomous
Common Coachwhip
Masticophis flagellum
Harmless
Common Sharp-tailed Snake
Contia tenuis
Harmless
Sierra Garter Snake
Thamnophis couchii
Harmless
No photo
Mexican Whip Snake
Masticophis lineatus
Harmless
Compiled from verified GBIF & iNaturalist observations. Informational only.