When to plant Watermelon in North Dakota
In spring, from May 15 – June 15 in Fargo to June 15 – July 1 in Williston.
In fall, from May 1 – June 15 in Dickinson to May 15 – June 1 in West Fargo.
USDA's earliest safe spring and latest safe fall planting dates, matched to each place's average frost dates.
| Place | Spring | Fall |
|---|---|---|
| Bismarck | June 1 – 15 | May 15 – June 1 |
| Dickinson | June 15 – July 1 | May 1 – June 15 |
| Fargo | May 15 – June 15 | May 15 – June 1 |
| Grand Forks | June 1 – 15 | May 15 – June 1 |
| Jamestown | June 1 – 15 | May 15 – June 1 |
| Mandan | June 1 – 15 | May 15 – June 1 |
| Minot | June 1 – 15 | May 15 – June 1 |
| West Fargo | May 15 – June 15 | May 15 – June 1 |
| Williston | June 15 – July 1 | May 1 – June 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 watermelon.