Last frost date in Jamestown, North Dakota
May 8
Average last frost in spring. In an early year (1 in 10) it's over by April 26; in a late year (1 in 10) it comes after May 21.
September 29
Average first frost in fall. 1 year in 10 it comes by September 17.
Source: NOAA U.S. Climate Normals 1991–2020, station Jamestown State Hosp (USC00324418), 1.5 miles from Jamestown, elevation 1,467 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 26 | May 8 | May 21 |
| First frost in fall | Sept 17 | Sept 29 | Oct 11 |
Frost-free days in an average year: 143
| Chance in a year | Average last in spring | Average first in fall | |
|---|---|---|---|
| Light frost (36°F) | Every year | May 17 | Sept 21 |
| Frost (32°F) | Every year | May 8 | Sept 29 |
| Hard freeze (28°F) | Every year | Apr 30 | Oct 7 |
Nights at 32°F or colder in an average year: 181
What to plant now in Jamestown
- Spring planting calendar for an average last frost around May 10 Jamestown: May 8
- Fall planting calendar for an average first frost around September 30 Jamestown: September 29
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
- Fargo 88 mi · last frost May 4
- Bismarck 98 mi · last frost May 10
- Grand Forks 103 mi · last frost May 10
- Mandan 104 mi · last frost May 13
- Minot 152 mi · last frost May 10
Updated