When to plant spinach in zone 4b — planting calendar

Not your zone?

Showing USDA Zone 4B

Growing SeasonZone 4b

Last frost ~May 15First frost ~Sep 25Today

Start indoorsTransplant / sowHarvestFrost risk

APRMAYJUNJUL

Sow Apr 17 · First harvest May 24 · Wrap by Jun 21

Last spring frostMay 15

Direct sowApr 17

First harvestMay 24

Last harvestJun 21

Fall succession sowJul 31

First fall frostSep 25

Why these dates work in zone 4b

Zone 4b's last spring frost averages May 15 and first fall frost Sep 25 — about 133 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 31 for a second harvest before frost.

Common questions

How long does spinach take to grow in zone 4b?

Spinach matures in about 37–50 days from sowing. In zone 4b that means sowing around Apr 17 and first picking around May 24.

Will spinach survive frost in zone 4b?

Yes — spinach tolerates light frost. In zone 4b you can sow a little before the last frost (around May 15) and keep harvesting past the first fall frost (around Sep 25).

Can I plant a second crop of spinach in zone 4b?

Yes — in zone 4b there's time for a fall sowing around Jul 31 for a second harvest before frost.

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