When to plant Winter Squash in Zone 4a
In Zone 4a, Winter Squash: direct sow outdoors around May 15–Jun 5. Expect to harvest around Aug 18–Sep 8.
| Step | When |
|---|---|
| Direct sow outdoors | May 15 – Jun 5 |
| Harvest | Aug 18 – Sep 8 |
Tip: Harvest when the rind is hard and can't be dented by a thumbnail, then cure for storage.
Zone 4a averages a last spring frost around May 15 and a first fall frost around Sep 18. These are zone averages — look up your ZIP for your exact area.
See the full Zone 4a calendar in the tool →