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🍃 Growing Spinach in Zone 12b

Zone 12b has a year-round growing season. Spinach can be planted almost any time with proper planning. Last frost: Jan 1. First frost: Dec 31.

Planting Calendar

Indoor

Outdoor

Harvest

Nov 20Dec 31

Season: Jan 1 – Dec 31 (364 days) · Succession: plant every 2 weeks (up to 23x)

Zone12b

Last FrostJan 1

First FrostDec 31

Season Length364 days

Days to Harvest40

SunPart Sun / Part Shade

Frost ToleranceHeavy

Spacing9/sqft (4" apart)

When to Plant Spinach in Zone 12b

Start Seeds Indoors: Nov 20

Start Spinach seeds indoors around Nov 20 (6 weeks before last frost). Optimal germination temperature: 60°F. Germinates in 6–14 days.

Transplant Outdoors: Dec 4

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

Harvest: Jan 13

First harvest approximately Jan 13 (~40 days from planting). Continue harvesting until first frost (Dec 31). Spinach can overwinter in mild climates for continued harvest.

Fall Planting: Nov 19

For a fall harvest, plant Spinach around Nov 19 (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 12b?

Start Spinach seeds indoors around Nov 20. Transplant outdoors after Dec 4. Expect first harvest around Jan 13.

What is the last frost date for Zone 12b?

The average last spring frost date for Zone 12b is Jan 1. The first fall frost averages Dec 31, giving a 364-day growing season.

Can I grow Spinach in Zone 12b?

Yes. Spinach needs 40 days to harvest. Zone 12b has a 364-day growing season, which is sufficient. You can plant up to 23 successions.

What is the best month to plant Spinach in Zone 12b?

The best time to start Spinach in Zone 12b is Nov. Begin seeds indoors around Nov 20, then transplant outdoors after the last frost date of Jan 1.

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 12b, expect your first harvest around Jan 13.

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