When to plant bok choy in zone 3b — planting calendar

Growing SeasonZone 3b

Last frost ~May 6First frost ~Oct 22Today

Start indoorsTransplant / sowHarvestFrost risk

MARAPRMAYJUN

Start indoors Apr 8 · Transplant Apr 15 · First harvest May 30 · Wrap by Jun 20

Last spring frostMay 6

Start seeds indoorsApr 8

Transplant outApr 15

First harvestMay 30

Last harvestJun 20

Fall succession sowAug 27

First fall frostOct 22

Why these dates work in zone 3b

Zone 3b's last spring frost averages May 6 and first fall frost Oct 22 — about 169 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 Aug 27 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 Apr 15 and first picking around May 30.

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 6) and keep harvesting past the first fall frost (around Oct 22).

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

Yes — in zone 3b there's time for a fall sowing around Aug 27 for a second harvest before frost.

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

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