When to plant Winter Squash in Zone 4b
In Zone 4b, Winter Squash: direct sow outdoors around May 10–May 31. Expect to harvest around Aug 13–Sep 3.
| Step | When |
|---|---|
| Direct sow outdoors | May 10 – May 31 |
| Harvest | Aug 13 – Sep 3 |
Tip: Harvest when the rind is hard and can't be dented by a thumbnail, then cure for storage.
Zone 4b averages a last spring frost around May 10 and a first fall frost around Sep 22. These are zone averages — look up your ZIP for your exact area.
See the full Zone 4b calendar in the tool →