DibbleWhen to plant winter squash in Zone 3
In Zone 3, the last spring frost usually passes around May 15 and the first fall frost arrives around September 15, leaving about 123 frost-free days. The windows below are computed from those frost dates, with the same math the Dibble app uses.
Short, cool season. Start most warm crops indoors and protect from late frosts.
Planting windows for winter squash in Zone 3
| Task | Window |
|---|---|
| Direct sow | May 29 to Jun 12 |
| Estimated harvest | Sep 6 to Sep 27 |
The harvest estimate counts 100 days to maturity, then a picking window of about 21 days. These windows use typical frost dates for Zone 3; Dibble pins them to your exact ZIP code.
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How to grow winter squash
Give winter squash and pumpkins room to roam. Sow 2 weeks after last frost and cure the mature fruit before storing.
Companion plants
Good neighbors for Winter Squash:
Better kept apart:
Winter Squash in nearby zones
Keep exploring
Winter Squash: the full growing guide · The Zone 3 planting calendar · Every crop and zone
Plant at the right time this season
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Dates are estimates based on typical frost dates for the zone. Your yard has its own microclimate, so use them as a starting point and adjust as you learn your space.