San Diego County, California is in USDA Hardiness Zones 8a, 8b, 9a, 9b, 10a and 10b

San Diego County, California Hardiness Zone Map

San Diego County Border
Zone 8a
10°F to 15°F
Zone 8b
15°F to 20°F
Zone 9a
20°F to 25°F
Zone 9b
25°F to 20°F
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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