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When to plant summer squash & zucchini in Zone 4a
In Zone 4a, direct-sow or transplant around May 21 – June 4.
Your summer squash & zucchini timeline — Zone 4a
| Start indoors | April 30 – May 7 |
|---|---|
| Transplant | May 21 – June 4 |
| Zone 4a last frost | ~05/14 |
| Zone 4a first frost | ~09/27 |
Direct-sow or set out 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 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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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).