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When to plant sweet corn in Zone 5b
In Zone 5b, direct-sow around May 4 – May 18.
Your sweet corn timeline — Zone 5b
| Direct-sow | May 4 – May 18 |
|---|---|
| Zone 5b last frost | ~05/04 |
| Zone 5b first frost | ~10/08 |
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 5b'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).