When to plant Summer squash (zucchini) in New Hampshire
In spring, from May 1 – 30 in Dover to May 10 – June 10 in Lebanon.
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 10 | June 1 – July 1 |
| Concord | May 10 – June 10 | June 1 – July 1 |
| Dover | May 1 – 30 | June 1 – July 15 |
| Keene | May 10 – June 10 | June 1 – July 1 |
| Laconia | May 1 – 30 | June 1 – July 20 |
| Lebanon | May 10 – June 10 | June 1 – July 15 |
| Manchester | May 1 – 30 | June 1 – July 15 |
| Nashua | May 1 – 30 | June 1 – July 15 |
| Portsmouth | May 1 – 30 | June 1 – July 15 |
| Rochester | May 1 – 30 | June 1 – July 15 |
| Somersworth | May 1 – 30 | June 1 – July 15 |
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 summer squash.