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When to plant onions in Zone 7b
In Zone 7b, start indoors around December 29 – January 12 and transplant around March 2 – March 16.
Your onions timeline — Zone 7b
| Start indoors | December 29 – January 12 |
|---|---|
| Transplant | March 2 – March 16 |
| Zone 7b last frost | ~04/06 |
| Zone 7b first frost | ~11/01 |
Start indoors; set out 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 7b'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).