San Francisco, California is in USDA Hardiness Zones 10a and 10b

San Francisco, California Hardiness Zone Map

San Francisco Border
Zone 10a
30°F to 25°F
Zone 10b
35°F to 30°F

A hardiness zone is a geographically defined area in which a specific category of plant life is capable of growing, as defined by climatic conditions, including its ability to withstand the minimum temperatures of the zone.

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