When to plant Winter Squash in Zone 3b
In Zone 3b, Winter Squash: direct sow outdoors around May 20–Jun 10. Expect to harvest around Aug 23–Sep 13.
| Step | When |
|---|---|
| Direct sow outdoors | May 20 – Jun 10 |
| Harvest | Aug 23 – Sep 13 |
Tip: Harvest when the rind is hard and can't be dented by a thumbnail, then cure for storage.
Zone 3b averages a last spring frost around May 20 and a first fall frost around Sep 12. These are zone averages — look up your ZIP for your exact area.
See the full Zone 3b calendar in the tool →