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🍃 Growing Spinach in Zone 10b

Zone 10b has a year-round growing season. Spinach can be planted almost any time with proper planning. Last frost: Jan 28. First frost: Dec 22.

Planting Calendar

Indoor

Outdoor

Harvest

Dec 17Dec 22

Season: Jan 28 – Dec 22 (328 days) · Succession: plant every 2 weeks (up to 20x)

Zone10b

Last FrostJan 28

First FrostDec 22

Season Length328 days

Days to Harvest40

SunPart Sun / Part Shade

Frost ToleranceHeavy

Spacing9/sqft (4" apart)

When to Plant Spinach in Zone 10b

Start Seeds Indoors: Dec 17

Start Spinach seeds indoors around Dec 17 (6 weeks before last frost). Optimal germination temperature: 60°F. Germinates in 6–14 days.

Transplant Outdoors: Dec 31

Transplant Spinach seedlings outdoors after Dec 31. Wait until soil temperature reaches 35°F. Space plants at 9/sqft (4" apart). Harden off plants for a week before moving outside.

Harvest: Feb 9

First harvest approximately Feb 9 (~40 days from planting). Continue harvesting until first frost (Dec 22). Spinach can overwinter in mild climates for continued harvest.

Fall Planting: Nov 10

For a fall harvest, plant Spinach around Nov 10 (6 weeks before first frost).

Companion Planting

✅ Cauliflower ✅ Cabbage✅ Beans✅ Strawberries

Spinach in Other Zones

1a 1b 2a 2b 3a 3b 4a 4b 5a 5b 6a 6b 7a 7b 8a 8b 9a 9b 10a 10b 11a 11b 12a 12b 13a 13b

Frequently Asked Questions

When should I plant Spinach in Zone 10b?

Start Spinach seeds indoors around Dec 17. Transplant outdoors after Dec 31. Expect first harvest around Feb 9.

What is the last frost date for Zone 10b?

The average last spring frost date for Zone 10b is Jan 28. The first fall frost averages Dec 22, giving a 328-day growing season.

Can I grow Spinach in Zone 10b?

Yes. Spinach needs 40 days to harvest. Zone 10b has a 328-day growing season, which is sufficient. You can plant up to 20 successions.

What is the best month to plant Spinach in Zone 10b?

The best time to start Spinach in Zone 10b is Dec. Begin seeds indoors around Dec 17, then transplant outdoors after the last frost date of Jan 28.

What companion plants grow well with Spinach?

Good companion plants for Spinach include Cauliflower, Cabbage, Beans, Strawberries.

How long does Spinach take to harvest?

Spinach takes approximately 40 days from planting to harvest. In Zone 10b, expect your first harvest around Feb 9.

Plan Your Spinach Garden

Track Spinach from seed to harvest with personalized frost dates, watering recommendations, and companion planting visualization.

Start Free Spinach Growing Guide