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When to plant leeks in Zone 6b
In Zone 6b, start indoors around January 22 – February 5 and transplant around March 26 – April 9.
Your leeks timeline — Zone 6b
| Start indoors | January 22 – February 5 |
|---|---|
| Transplant | March 26 – April 9 |
| Zone 6b last frost | ~04/23 |
| Zone 6b first frost | ~10/20 |
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 6b'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).