When to plant Sweet Corn in Zone 4b
In Zone 4b, Sweet Corn: direct sow outdoors around May 10–May 31. Expect to harvest around Jul 24–Aug 14.
| Step | When |
|---|---|
| Direct sow outdoors | May 10 – May 31 |
| Harvest | Jul 24 – Aug 14 |
Tip: Sow in blocks (not single rows) so wind pollinates the ears well. Wait for warm soil.
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 →