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When to plant brussels sprouts in Zone 4a
In Zone 4a, start indoors around March 12 – March 26 and transplant around April 16 – April 30. For a fall crop, sow around May 9 – May 23.
Your brussels sprouts timeline — Zone 4a
| Start indoors | March 12 – March 26 |
|---|---|
| Transplant | April 16 – April 30 |
| Sow for fall | May 9 – May 23 |
| Zone 4a last frost | ~05/14 |
| Zone 4a first frost | ~09/27 |
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 4a'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).