According to the 2023 USDA Hardiness Zone Map San Diego County, California is in Zones 10a (30°F to 25°F), 10b (35°F to 30°F), 11a (40°F to 35°F), 8a (10°F to 15°F), 8b (15°F to 20°F), 9a (20°F to 25°F) and 9b (25°F to 20°F). This is a change from the 2012 USDA Hardiness Zone Map which has San Diego County in Zones 8a (10°F to 15°F), 8b (15°F to 20°F), 9a (20°F to 25°F), 9b (25°F to 20°F), 10a (30°F to 25°F) and 10b (35°F to 30°F).