When should I plant Spinach in Zone 4b?

Direct sow Spinach outdoors around Mar 20. Harvest around Apr 29.

What is the last frost date for Zone 4b?

The average last spring frost date for Zone 4b is May 1. The first fall frost averages Oct 5, giving a 157-day growing season.

Can I grow Spinach in Zone 4b?

Yes. Spinach needs 40 days to harvest. Zone 4b has a 157-day growing season, which is sufficient. You can plant up to 8 successions.

🍃

🍃 Growing Spinach in Zone 4b

Zone 4b has cold winters and a moderate growing season. Timing is key for Spinach in this zone. Last frost: May 1. First frost: Oct 5.

Planting Calendar

Outdoor

Harvest

Mar 20Oct 5

Season: May 1 – Oct 5 (157 days) · Succession: plant every 2 weeks (up to 8x)

Zone4b

Last FrostMay 1

First FrostOct 5

Season Length157 days

Days to Harvest40

SunPart Sun / Part Shade

Frost ToleranceHeavy

Spacing9/sqft (4" apart)

When to Plant Spinach in Zone 4b

Sow Seeds Outdoors: Mar 20

Direct sow Spinach seeds outdoors around Mar 20. Soil temperature should be at least 35°F. Space at 9/sqft (4" apart).

Harvest: Apr 29

First harvest approximately Apr 29 (~40 days from planting). Continue harvesting until first frost (Oct 5). Spinach can overwinter in mild climates for continued harvest.

Fall Planting: Aug 24

For a fall harvest, plant Spinach around Aug 24 (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