When to plant brussels sprouts 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

DECJANFEBMARAPRMAYJUN

Start indoors Jan 4 · Transplant Jan 25 · First harvest Apr 25 · Wrap by Jun 6

Last spring frostFeb 15

Start seeds indoorsJan 4

Transplant outJan 25

First harvestApr 25

Last harvestJun 6

Fall succession sowAug 27

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. Brussels Sprouts 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 6 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 brussels sprouts take to grow in zone 9b?

Brussels Sprouts matures in about 90–110 days from transplanting. In zone 9b that means setting plants out around Jan 25 and first picking around Apr 25.

Will brussels sprouts survive frost in zone 9b?

Yes — brussels sprouts 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 brussels sprouts in zone 9b?

Yes — in zone 9b 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 brussels sprouts growing guide →