Know the dangerous ones
Venomous snakes in San Francisco County, California
2 venomous snake species have verified records in San Francisco County. Learn to recognize each one, and know what to do if you are bitten.
Field entries
Crotalus viridis Prairie RattlesnakeVenomousCrotalus viridis
How to identify
Heavy body, broad triangular head, vertical (cat-like) pupils, and a segmented keratin rattle at the tail tip.
Rarely seenFull profile →
Crotalus ruber Red Diamond RattlesnakeVenomousCrotalus ruber
How to identify
Heavy body, broad triangular head, vertical (cat-like) pupils, and a segmented keratin rattle at the tail tip.
Rarely seenFull profile →
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