When to plant spinach in zone 3b — planting calendar

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Showing USDA Zone 3B

Growing SeasonZone 3b

Last frost ~May 25First frost ~Sep 15Today

Start indoorsTransplant / sowHarvestFrost risk

APRMAYJUNJUL

Sow Apr 27 · First harvest Jun 3 · Wrap by Jul 1

Last spring frostMay 25

Direct sowApr 27

First harvestJun 3

Last harvestJul 1

Fall succession sowJul 21

First fall frostSep 15

Why these dates work in zone 3b

Zone 3b's last spring frost averages May 25 and first fall frost Sep 15 — about 113 frost-free days. Spinach tolerates light frost, so you can sow ahead of the last-frost date and keep harvesting into the cooler fall. There's also room for a fall succession sowing around Jul 21 for a second harvest before frost.

Common questions

How long does spinach take to grow in zone 3b?

Spinach matures in about 37–50 days from sowing. In zone 3b that means sowing around Apr 27 and first picking around Jun 3.

Will spinach survive frost in zone 3b?

Yes — spinach tolerates light frost. In zone 3b you can sow a little before the last frost (around May 25) and keep harvesting past the first fall frost (around Sep 15).

Can I plant a second crop of spinach in zone 3b?

Yes — in zone 3b there's time for a fall sowing around Jul 21 for a second harvest before frost.

For soil, spacing, pests and companion planting, see the full spinach growing guide →