Last frost date in Grand Forks, North Dakota
May 10
Average last frost in spring. In an early year (1 in 10) it's over by April 28; in a late year (1 in 10) it comes after May 24.
October 1
Average first frost in fall. 1 year in 10 it comes by September 20.
Source: NOAA U.S. Climate Normals 1991–2020, station Grand Forks Univ (nws) (USC00323621), 0.5 miles from Grand Forks, elevation 830 ft. NOAA National Centers for Environmental Information. These are long-term averages, not a forecast.
| Early year | Average | Late year | |
|---|---|---|---|
| Last frost in spring | Apr 28 | May 10 | May 24 |
| First frost in fall | Sept 20 | Oct 1 | Oct 15 |
Frost-free days in an average year: 144
| Chance in a year | Average last in spring | Average first in fall | |
|---|---|---|---|
| Light frost (36°F) | Every year | May 19 | Sept 23 |
| Frost (32°F) | Every year | May 10 | Oct 1 |
| Hard freeze (28°F) | Every year | Apr 30 | Oct 12 |
Nights at 32°F or colder in an average year: 179
What to plant now in Grand Forks
- Spring planting calendar for an average last frost around May 10 Grand Forks: May 10
- Fall planting calendar for an average first frost around September 30 Grand Forks: October 1
Planting dates: USDA Home and Garden Bulletin No. 9 (1967), “Suburban and Farm Vegetable Gardens,” tables 4 and 5. How we match the table.
Nearby in North Dakota
Updated