When to plant Summer squash (zucchini) in Maine
In spring, from May 1 – June 15 in Auburn to May 20 – June 15 in Sanford.
In fall, June 1 – July 20.
USDA's earliest safe spring and latest safe fall planting dates, matched to each place's average frost dates.
| Place | Spring | Fall |
|---|---|---|
| Auburn | May 1 – June 15 | June 1 – July 20 |
| Augusta | May 1 – 30 | June 1 – July 20 |
| Bangor | May 1 – 30 | June 1 – July 1 |
| Biddeford | May 10 – June 10 | June 1 – July 1 |
| Lewiston | May 1 – June 15 | June 1 – July 20 |
| Portland | May 1 – 30 | June 1 – July 15 |
| Saco | May 1 – 30 | June 1 – July 15 |
| Sanford | May 20 – June 15 | June 1 – July 1 |
| South Portland | May 1 – 30 | June 1 – July 15 |
| Waterville | May 1 – 30 | June 1 – July 15 |
| Westbrook | 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. The full USDA table for summer squash.