Cool-Season Vegetable

When to Plant Spinach in California

Fast from seed to salad. Spinach bolts in heat, so plant early in spring and again in fall.

The Short Answer

Coastal California can grow spinach nearly year-round — the fog-cooled summers prevent bolting that plagues inland gardens. The state's diverse microclimates mean someone in California is always growing spinach, from Bay Area winter gardens to mountain spring plantings.

California Frost Dates

Your planting dates depend on which part of California you're in. Here are the frost date ranges by region:

Region Zones Last Frost (Spring) First Frost (Fall)
Northern California Mountains 5a, 5b, 6a, 6b May 1 - May 25 Sep 20 - Oct 15
Central Valley 9a, 9b Feb 10 - Mar 1 Nov 15 - Dec 5
Southern California Coast 10a, 10b, 11a Jan 1 - Feb 1 Dec 10 - Jan 1
Bay Area 9b, 10a Jan 20 - Feb 15 Nov 25 - Dec 15

Spinach Planting Schedule for California

Northern California Mountains (Zones 5a, 5b, 6a, 6b)

Average last frost: May 1 - May 25 · Average first frost: Sep 20 - Oct 15

Direct Sow
6 wks before frost
Fall Planting
6 wks before first frost

Central Valley (Zones 9a, 9b)

Average last frost: Feb 10 - Mar 1 · Average first frost: Nov 15 - Dec 5

Direct Sow
6 wks before frost
Fall Planting
6 wks before first frost

Southern California Coast (Zones 10a, 10b, 11a)

Average last frost: Jan 1 - Feb 1 · Average first frost: Dec 10 - Jan 1

Direct Sow
6 wks before frost
Fall Planting
6 wks before first frost

Bay Area (Zones 9b, 10a)

Average last frost: Jan 20 - Feb 15 · Average first frost: Nov 25 - Dec 15

Direct Sow
6 wks before frost
Fall Planting
6 wks before first frost

Growing Spinach in California

State-Specific Growing Tips

Coastal/Bay Area: grow year-round. Central Valley: sow September through February. Inland Southern California: October through March. Mountain regions: spring and fall. California's dry climate reduces disease pressure. Drip irrigation maintains consistent moisture without wetting foliage.

Recommended Varieties for California

Bloomsdale for traditional spring. Baby leaf spinach mixes for continuous cut-and-come-again harvest. Regiment for bolt resistance during warmer periods. Malabar spinach as a summer alternative in coastal gardens.

Common Challenges in California

Bolting in inland heat. Aphids year-round in mild climates. Downy mildew in coastal fog. Leaf miners.

Growing Tips

Direct sow as soon as soil can be worked in spring. For fall, plant 6-8 weeks before first frost.

Companion Planting

Plant spinach alongside these companions for better growth:

Strawberries Peas Radishes

The Bottom Line

Spinach can be grown successfully in California with proper attention to regional frost dates and local growing conditions. Timing varies across the state — Northern California Mountains gardeners work with a last frost around May 1 - May 25, while Bay Area sees frost end around Jan 20 - Feb 15. Choose varieties suited to your region, amend your soil based on its specific needs, and monitor for the pests and diseases most common in your area. For exact dates based on your zip code, use our free planting date finder.

Related Guides

Spinach Growing Guide National planting guide with all states California Planting Calendar All plants for California Spinach in Alabama Alabama planting dates Spinach in Alaska Alaska planting dates Spinach in Arizona Arizona planting dates Spinach in Arkansas Arkansas planting dates
Note: All dates are based on NOAA 30-year Climate Normals and represent historical averages, not predictions for any specific year. Always check your local weather forecast before planting frost-sensitive crops. Learn about our data sources.

Last reviewed: March 29, 2026

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