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When to plant brussels sprouts in Zone 3b
In Zone 3b, start indoors around March 18 – April 1 and transplant around April 22 – May 6. For a fall crop, sow around May 1 – May 15.
Your brussels sprouts timeline — Zone 3b
| Start indoors | March 18 – April 1 |
|---|---|
| Transplant | April 22 – May 6 |
| Sow for fall | May 1 – May 15 |
| Zone 3b last frost | ~05/20 |
| Zone 3b first frost | ~09/19 |
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 3b'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).