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When to plant sweet corn in Zone 4b
In Zone 4b, direct-sow around May 10 – May 24.
Your sweet corn timeline — Zone 4b
| Direct-sow | May 10 – May 24 |
|---|---|
| Zone 4b last frost | ~05/10 |
| Zone 4b first frost | ~09/30 |
Direct-sow when soil warms to 60°F (after the last frost). [src]Cited: University of New Hampshire Cooperative Extension — “Growing Vegetables: When to Plant Your Vegetable Garden”
Dates computed from Zone 4b'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).