When to plant bok choy 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

Start indoors Apr 27 · Transplant May 4 · First harvest Jun 18 · Wrap by Jul 9

Last spring frostMay 25

Start seeds indoorsApr 27

Transplant outMay 4

First harvestJun 18

Last harvestJul 9

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. Bok Choy tolerates light frost, so you can set plants out ahead of the last-frost date and keep harvesting into the cooler fall. Starting seeds indoors 4 weeks ahead gives strong transplants ready the moment the soil warms. There's also room for a fall succession sowing around Jul 21 for a second harvest before frost.

Common questions

How long does bok choy take to grow in zone 3b?

Bok Choy matures in about 45–60 days from transplanting. In zone 3b that means setting plants out around May 4 and first picking around Jun 18.

Will bok choy survive frost in zone 3b?

Yes — bok choy tolerates light frost. In zone 3b you can set plants out 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 bok choy 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 bok choy growing guide →