When to plant bok choy in zone 9b — planting calendar

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Showing USDA Zone 9B

Growing SeasonZone 9b

Last frost ~Feb 15First frost ~Dec 10Today

Start indoorsTransplant / sowHarvestFrost risk

JANFEBMARAPR

Start indoors Jan 18 · Transplant Jan 25 · First harvest Mar 11 · Wrap by Apr 1

Last spring frostFeb 15

Start seeds indoorsJan 18

Transplant outJan 25

First harvestMar 11

Last harvestApr 1

Fall succession sowOct 15

First fall frostDec 10

Why these dates work in zone 9b

Zone 9b's last spring frost averages Feb 15 and first fall frost Dec 10 — about 298 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 Oct 15 for a second harvest before frost.

Common questions

How long does bok choy take to grow in zone 9b?

Bok Choy matures in about 45–60 days from transplanting. In zone 9b that means setting plants out around Jan 25 and first picking around Mar 11.

Will bok choy survive frost in zone 9b?

Yes — bok choy tolerates light frost. In zone 9b you can set plants out a little before the last frost (around Feb 15) and keep harvesting past the first fall frost (around Dec 10).

Can I plant a second crop of bok choy in zone 9b?

Yes — in zone 9b there's time for a fall sowing around Oct 15 for a second harvest before frost.

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