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When to plant basil in Zone 3b
In Zone 3b, start indoors around April 19 and transplant around May 24 – June 7.
Your basil timeline — Zone 3b
| Start indoors | April 19 |
|---|---|
| Transplant | May 24 – June 7 |
| Zone 3b last frost | ~05/20 |
| Zone 3b first frost | ~09/19 |
Start indoors; set out 1–2 weeks after 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”.