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.

What to plant now in San Diego

Year-round: The distinction between seasons is minor in San Diego. Focus on what's in peak production.
Fall & Winter (Sep–Feb): Excellent for cool-season crops and a second round of warm-season crops.
Spring: Ramp up warm-season planting — tomatoes, peppers, squash, beans.
Summer: Full summer garden. Drip irrigation essential — no summer rain.

San Diego has a year-round, frost-free season. Cool-season crops: Lettuce, Carrots, Peas, Onion, Spinach, Kale, Broccoli, Cabbage, Radish, Beets, Potatoes, Garlic, Strawberry, Cauliflower, Swiss Chard, Arugula, Brussel Sprouts, Cilantro, Parsley, Celery, Scallions, Turnip, Kohlrabi, Bok Choy, Collards, Chives, Dill, Oregano, Rosemary, Sage, Thyme, Calendula, Lavender, Mint. Warm-season crops: Tomato, Pepper, Cucumber, Beans, Zucchini, Corn, Pumpkin, Butternut Squash, Eggplant, Okra, Basil, Cantaloupe, Cosmos, Marigolds, Melons, Nasturtiums, Pole Beans, Spaghetti Squash, Sunflowers, Tomatillos, Watermelon, Yellow Squash, Zinnias.

Month by month in San Diego

Month	What to do
January	Plant cool-season crops. Start tomato seeds indoors. Garlic growing.
February	Start warm-season seedlings. Direct sow peas and lettuce.
March	Transplant tomatoes and peppers in warm spots. Plant beans.
April	Full spring planting: squash, cucumbers, corn.
May	Summer crops established. Set up drip irrigation.
June	Summer garden. Morning fog keeps coastal areas cool.
July	Harvest summer crops. Start seeds for fall planting.
August	Plant fall tomatoes and warm-season crops for second harvest.
September	Transition to fall garden: broccoli, kale, lettuce.
October	Plant garlic and cool-season crops. Rains may return.
November	Cool-season crops growing rapidly.
December	Harvest winter crops. Excellent growing conditions.

Frost dates for San Diego ZIP codes

ZIP	Last spring frost (50%)	First fall frost (50%)	Zone
92154	—	—	10b
92129	—	—	10a

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.