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🍃 Growing Spinach in Zone 1b

Zone 1b has harsh winters and a short growing season. Start Spinach early indoors to maximize your harvest window. Last frost: May 25. First frost: Aug 28.

Planting Calendar

Indoor

Outdoor

Harvest

Apr 13Aug 28

Season: May 25 – Aug 28 (95 days) · Succession: plant every 2 weeks (up to 3x)

Zone1b

Last FrostMay 25

First FrostAug 28

Season Length95 days

Days to Harvest40

SunPart Sun / Part Shade

Frost ToleranceHeavy

Spacing9/sqft (4" apart)

When to Plant Spinach in Zone 1b

Start Seeds Indoors: Apr 13

Start Spinach seeds indoors around Apr 13 (6 weeks before last frost). Optimal germination temperature: 60°F. Germinates in 6–14 days.

Transplant Outdoors: Apr 27

Transplant Spinach seedlings outdoors after Apr 27. Wait until soil temperature reaches 35°F. Space plants at 9/sqft (4" apart). Harden off plants for a week before moving outside.

Harvest: Jun 6

First harvest approximately Jun 6 (~40 days from planting). Continue harvesting until first frost (Aug 28). Spinach can overwinter in mild climates for continued harvest.

Fall Planting: Jul 17

For a fall harvest, plant Spinach around Jul 17 (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 1b?

Start Spinach seeds indoors around Apr 13. Transplant outdoors after Apr 27. Expect first harvest around Jun 6.

What is the last frost date for Zone 1b?

The average last spring frost date for Zone 1b is May 25. The first fall frost averages Aug 28, giving a 95-day growing season.

Can I grow Spinach in Zone 1b?

Yes. Spinach needs 40 days to harvest. Zone 1b has a 95-day growing season, which is sufficient. You can plant up to 3 successions.

What is the best month to plant Spinach in Zone 1b?

The best time to start Spinach in Zone 1b is Apr. Begin seeds indoors around Apr 13, then transplant outdoors after the last frost date of May 25.

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 1b, expect your first harvest around Jun 6.

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