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When to plant brussels sprouts in Zone 9a
In Zone 9a, start indoors around December 29 – January 12 and transplant around February 2 – February 16. For a fall crop, sow around July 7 – July 21.
Your brussels sprouts timeline — Zone 9a
| Start indoors | December 29 – January 12 |
|---|---|
| Transplant | February 2 – February 16 |
| Sow for fall | July 7 – July 21 |
| Zone 9a last frost | ~03/02 |
| Zone 9a first frost | ~11/25 |
Start indoors; set out 2–4 weeks before the last frost. [src]Cited: University of New Hampshire Cooperative Extension — “Growing Vegetables: When to Plant Your Vegetable Garden”
Dates computed from Zone 9a's median NOAA frost normals and the cited rule. Your town may differ by a week or two — check your exact ZIP.
What you'll need
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Last verified 2026-07-16. Frost: NOAA NCEI 1991–2020. Zone: USDA 2023. Rule: University of New Hampshire Cooperative Extension — “Growing Vegetables: When to Plant Your Vegetable Garden”; UGA Extension (days to maturity).