When to plant Sweet corn in New Hampshire
In spring, May 10 – June 1.
In fall, June 1 – July 1.
USDA's earliest safe spring and latest safe fall planting dates, matched to each place's average frost dates.
| Place | Spring | Fall |
|---|---|---|
| Claremont | May 10 – June 1 | June 1 – July 1 |
| Concord | May 10 – June 1 | June 1 – July 1 |
| Dover | May 10 – June 15 | June 1 – July 10 |
| Keene | May 10 – June 1 | June 1 – July 1 |
| Laconia | May 10 – June 15 | June 1 – July 20 |
| Lebanon | May 10 – June 1 | June 1 – July 10 |
| Manchester | May 10 – June 15 | June 1 – July 10 |
| Nashua | May 10 – June 15 | June 1 – July 10 |
| Portsmouth | May 10 – June 15 | June 1 – July 10 |
| Rochester | May 10 – June 15 | June 1 – July 10 |
| Somersworth | May 10 – June 15 | June 1 – July 10 |
Planting dates: USDA Home and Garden Bulletin No. 9 (1967), tables 4 and 5. Frost dates: NOAA U.S. Climate Normals 1991–2020. “—” means the place's frost date is outside the table. The full USDA table for sweet corn.