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

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Showing USDA Zone 3A

Growing SeasonZone 3a

Last frost ~May 30First frost ~Sep 10Today

Start indoorsTransplant / sowHarvestFrost risk

APRMAYJUNJUL

Start indoors May 2 · Transplant May 9 · First harvest Jun 23 · Wrap by Jul 14

Last spring frostMay 30

Start seeds indoorsMay 2

Transplant outMay 9

First harvestJun 23

Last harvestJul 14

Fall succession sowJul 16

First fall frostSep 10

Why these dates work in zone 3a

Zone 3a's last spring frost averages May 30 and first fall frost Sep 10 — about 103 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 16 for a second harvest before frost.

Common questions

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

Bok Choy matures in about 45–60 days from transplanting. In zone 3a that means setting plants out around May 9 and first picking around Jun 23.

Will bok choy survive frost in zone 3a?

Yes — bok choy tolerates light frost. In zone 3a you can set plants out a little before the last frost (around May 30) and keep harvesting past the first fall frost (around Sep 10).

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

Yes — in zone 3a there's time for a fall sowing around Jul 16 for a second harvest before frost.

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