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← How to grow bok choy
Planting Calendar · Zone 4A

When to plant bok choy in zone 4a

In USDA zone 4a, start bok choy seeds indoors around Apr 9, transplant outdoors Apr 16, and harvest from May 31.

Growing SeasonZone 4a
Last frost ~May 7First frost ~Oct 13Today
Start indoorsTransplant / sowHarvestFrost risk
MARAPRMAYJUNJUL
Start indoors Apr 9 · Transplant Apr 16 · First harvest May 31 · Wrap by Jun 21
Last spring frostMay 7
Start seeds indoorsApr 9
Transplant outApr 16
First harvestMay 31
Last harvestJun 21
Fall succession sowAug 18
First fall frostOct 13

Why these dates work in zone 4a

Zone 4a's last spring frost averages May 7 and first fall frost Oct 13 — about 159 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 18 for a second harvest before frost.

Common questions

How long does bok choy take to grow in zone 4a?

Bok Choy matures in about 45–60 days from transplanting. In zone 4a that means setting plants out around Apr 16 and first picking around May 31.

Will bok choy survive frost in zone 4a?

Yes — bok choy tolerates light frost. In zone 4a you can set plants out a little before the last frost (around May 7) and keep harvesting past the first fall frost (around Oct 13).

Can I plant a second crop of bok choy in zone 4a?

Yes — in zone 4a there's time for a fall sowing around Aug 18 for a second harvest before frost.

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