When to Plant in San Diego, CA

San Diego's Mediterranean climate is one of the most forgiving in North America for gardening — essentially frost-free (Zone 10a/10b), with mild temperatures year-round. Summer heat is moderated by ocean breezes, rarely exceeding 90°F in coastal areas.

San Diego gardeners can grow food year-round. The main challenge is summer water — rainfall is minimal from May through November. Drip irrigation and water-wise gardening are essential. The cooler coastal zone also limits very heat-demanding crops.

FAQ

Does San Diego have a last frost date?

San Diego is essentially frost-free. Most coastal neighborhoods never see frost. The average last frost for inland areas is around December 15th. Year-round gardening is the norm.

What grows best in San Diego?

San Diego's climate supports almost everything. Tomatoes, peppers, and squash thrive in summer. Broccoli, kale, lettuce, and root vegetables produce year-round. Avocados, citrus, and subtropical fruits also grow well.

How much do I need to water in San Diego?

Significantly — San Diego gets only 10–12 inches of rain per year, almost all in winter. Drip irrigation is essential from May through November. Deep mulching reduces water needs.

Can I grow avocados in San Diego?

Yes! San Diego is one of the best places in the country for avocados. They need frost protection when young but thrive in established gardens throughout the county.

How does Plan My Garden help San Diego gardeners?

Enter your San Diego zip code for a year-round planting schedule tuned to your coastal microclimate.

Frost dates for San Diego ZIP codes

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