California
Snakes in Napa County
18 species have been documented here, 2 of them venomous.
Venomous snakes in Napa County
Full guide & what to do if bitten →
Western RattlesnakeCrotalus oreganusVenomousHeavy body, broad triangular head, vertical (cat-like) pupils, and a segmented keratin rattle at the tail tip.
Prairie RattlesnakeCrotalus viridisVenomousHeavy body, broad triangular head, vertical (cat-like) pupils, and a segmented keratin rattle at the tail tip.
Every snake recorded in Napa County
Gopher Snake
Pituophis catenifer
Harmless
Ring-necked Snake
Diadophis punctatus
Harmless
Common Sharp-tailed Snake
Contia tenuis
Harmless
Western Rattlesnake
Crotalus oreganus
Venomous
Aquatic Garter Snake
Thamnophis atratus
Harmless
California King Snake
Lampropeltis californiae
Harmless
Common Garter Snake
Thamnophis sirtalis
Harmless
Western Terrestrial Garter Snake
Thamnophis elegans
Harmless
Striped Racer
Masticophis lateralis
Harmless
No photo
Mexican Whip Snake
Masticophis lineatus
Harmless
North American Racer
Coluber constrictor
Harmless
Eastern Kingsnake
Lampropeltis getula
Harmless
Coast Night Snake
Hypsiglena ochrorhynchus
Harmless
Prairie Rattlesnake
Crotalus viridis
Venomous
California Mountain Kingsnake
Lampropeltis zonata
Harmless
Sinaloan Nightsnake
Hypsiglena torquata
Harmless
Northern Rubber Boa
Charina bottae
Harmless
Pine Snake
Pituophis melanoleucus
Harmless
Compiled from verified GBIF & iNaturalist observations. Informational only.