When to plant Sweet Corn in Zone 4a
In Zone 4a, Sweet Corn: direct sow outdoors around May 15–Jun 5. Expect to harvest around Jul 29–Aug 19.
| Step | When |
|---|---|
| Direct sow outdoors | May 15 – Jun 5 |
| Harvest | Jul 29 – Aug 19 |
Tip: Sow in blocks (not single rows) so wind pollinates the ears well. Wait for warm soil.
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 →