DibbleWhen to plant brussels sprouts in Zone 9
In Zone 9, the last spring frost usually passes around March 1 and the first fall frost arrives around December 1, leaving about 275 frost-free days. The windows below are computed from those frost dates, with the same math the Dibble app uses.
Very long season. Plant cool crops in fall and winter; manage summer heat.
Planting windows for brussels sprouts in Zone 9
| Task | Window |
|---|---|
| Start seeds indoors | Feb 1 to Feb 15 |
| Transplant | Mar 15 to Mar 29 |
| Estimated harvest | Jun 23 to Jul 23 |
The harvest estimate counts 100 days to maturity, then a picking window of about 30 days. These windows use typical frost dates for Zone 9; Dibble pins them to your exact ZIP code.
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How to grow brussels sprouts
A long-season brassica best for fall. Start indoors around last frost, transplant after, and let frost sweeten the sprouts.
Companion plants
Good neighbors for Brussels Sprouts:
Better kept apart:
Brussels Sprouts in nearby zones
Keep exploring
Brussels Sprouts: the full growing guide · The Zone 9 planting calendar · Every crop and zone
Plant at the right time this season
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Dates are estimates based on typical frost dates for the zone. Your yard has its own microclimate, so use them as a starting point and adjust as you learn your space.