When to plant radish in zone 6b — planting calendar

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Showing USDA Zone 6B

Growing SeasonZone 6b

Last frost ~Apr 20First frost ~Oct 15Today

Start indoorsTransplant / sowHarvestFrost risk

MARAPRMAY

Sow Mar 23 · First harvest Apr 14 · Wrap by Apr 28

Last spring frostApr 20

Direct sowMar 23

First harvestApr 14

Last harvestApr 28

Fall succession sowSep 3

First fall frostOct 15

Why these dates work in zone 6b

Zone 6b's last spring frost averages Apr 20 and first fall frost Oct 15 — about 178 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 Sep 3 for a second harvest before frost.

Common questions

How long does radish take to grow in zone 6b?

Radish matures in about 22–30 days from sowing. In zone 6b that means sowing around Mar 23 and first picking around Apr 14.

Will radish survive frost in zone 6b?

Yes — radish tolerates light frost. In zone 6b you can sow a little before the last frost (around Apr 20) and keep harvesting past the first fall frost (around Oct 15).

Can I plant a second crop of radish in zone 6b?

Yes — in zone 6b there's time for a fall sowing around Sep 3 for a second harvest before frost.

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