When to plant radish 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

APRMAYJUN

Sow Apr 27 · First harvest May 19 · Wrap by Jun 2

Last spring frostMay 25

Direct sowApr 27

First harvestMay 19

Last harvestJun 2

Fall succession sowAug 4

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. Radish 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 Aug 4 for a second harvest before frost.

Common questions

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

Radish matures in about 22–30 days from sowing. In zone 3b that means sowing around Apr 27 and first picking around May 19.

Will radish survive frost in zone 3b?

Yes — radish 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 radish in zone 3b?

Yes — in zone 3b there's time for a fall sowing around Aug 4 for a second harvest before frost.

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