4a When to plant winter squash & pumpkins in zone 4a
Zone 4a median last spring freeze: May 15 · first fall freeze: Sep 24 · harvest in ~80-120 days.
| Step | Zone 4a dates | Note |
|---|---|---|
| Start seeds indoors | Apr 24 – May 8 | 6–10 weeks before transplanting |
| Transplant outside | May 22 | after last spring freeze |
| Direct sow (spring) | May 8 | before last spring freeze |
How winter squash & pumpkins grow in zone 4a
Direct sow or transplant both work. Tender — damaged by any frost. Harvest runs roughly 80-120 days after planting. These windows come from extension planting tables anchored to zone 4a's median freeze dates — for varieties and local conditions, check with your local extension office.
Next: the full zone 4a calendar · other crops in zone 4a: tomatoes · peppers · cucumbers · zucchini & summer squash · snap beans · sweet corn · peas · lettuce · spinach · 5 more