When to plant brussels sprouts in zone 9a — planting calendar

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Showing USDA Zone 9A

Growing SeasonZone 9a

Last frost ~Feb 28First frost ~Nov 30Today

Start indoorsTransplant / sowHarvestFrost risk

JANFEBMARAPRMAYJUN

Start indoors Jan 17 · Transplant Feb 7 · First harvest May 8 · Wrap by Jun 19

Last spring frostFeb 28

Start seeds indoorsJan 17

Transplant outFeb 7

First harvestMay 8

Last harvestJun 19

Fall succession sowAug 17

First fall frostNov 30

Why these dates work in zone 9a

Zone 9a's last spring frost averages Feb 28 and first fall frost Nov 30 — about 275 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 17 for a second harvest before frost.

Common questions

How long does brussels sprouts take to grow in zone 9a?

Brussels Sprouts matures in about 90–110 days from transplanting. In zone 9a that means setting plants out around Feb 7 and first picking around May 8.

Will brussels sprouts survive frost in zone 9a?

Yes — brussels sprouts tolerates light frost. In zone 9a you can set plants out a little before the last frost (around Feb 28) and keep harvesting past the first fall frost (around Nov 30).

Can I plant a second crop of brussels sprouts in zone 9a?

Yes — in zone 9a there's time for a fall sowing around Aug 17 for a second harvest before frost.

For soil, spacing, pests and companion planting, see the full brussels sprouts growing guide →