When should I plant Spinach in Zone 3b?

Direct sow Spinach outdoors around Apr 3. Harvest around May 13.

What is the last frost date for Zone 3b?

The average last spring frost date for Zone 3b is May 15. The first fall frost averages Sep 22, giving a 130-day growing season.

Can I grow Spinach in Zone 3b?

Yes. Spinach needs 40 days to harvest. Zone 3b has a 130-day growing season, which is sufficient. You can plant up to 6 successions.

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🍃 Growing Spinach in Zone 3b

Zone 3b has harsh winters and a short growing season. Start Spinach early indoors to maximize your harvest window. Last frost: May 15. First frost: Sep 22.

Planting Calendar

Outdoor

Harvest

Apr 3Sep 22

Season: May 15 – Sep 22 (130 days) · Succession: plant every 2 weeks (up to 6x)

Zone3b

Last FrostMay 15

First FrostSep 22

Season Length130 days

Days to Harvest40

SunPart Sun / Part Shade

Frost ToleranceHeavy

Spacing9/sqft (4" apart)

When to Plant Spinach in Zone 3b

Sow Seeds Outdoors: Apr 3

Direct sow Spinach seeds outdoors around Apr 3. Soil temperature should be at least 35°F. Space at 9/sqft (4" apart).

Harvest: May 13

First harvest approximately May 13 (~40 days from planting). Continue harvesting until first frost (Sep 22). Spinach can overwinter in mild climates for continued harvest.

Fall Planting: Aug 11

For a fall harvest, plant Spinach around Aug 11 (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

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