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When to plant sweet potatoes in Zone 4a
Your sweet potatoes timeline — Zone 4a
| Direct-sow | May 18 – June 1 |
|---|---|
| Zone 4a last frost | ~05/14 |
| Zone 4a first frost | ~09/27 |
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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Calendar computed 2026-09-28. Frost: NOAA NCEI 1991–2020. Zone: USDA 2023. Rule: University of New Hampshire Cooperative Extension — “Growing Vegetables: When to Plant Your Vegetable Garden”; University of Georgia Extension — Vegetable Planting Chart (Circular C963) (days to maturity).