Last frost date in Mandan, North Dakota
May 13
Average last frost in spring. In an early year (1 in 10) it's over by May 1; in a late year (1 in 10) it comes after May 26.
September 27
Average first frost in fall. 1 year in 10 it comes by September 15.
Source: NOAA U.S. Climate Normals 1991–2020, station Mandan Exp Stn (USC00325479), 1.6 miles from Mandan, elevation 1,750 ft. NOAA National Centers for Environmental Information. These are long-term averages, not a forecast.
| Early year | Average | Late year | |
|---|---|---|---|
| Last frost in spring | May 1 | May 13 | May 26 |
| First frost in fall | Sept 15 | Sept 27 | Oct 10 |
Frost-free days in an average year: 136
| Chance in a year | Average last in spring | Average first in fall | |
|---|---|---|---|
| Light frost (36°F) | Every year | May 23 | Sept 19 |
| Frost (32°F) | Every year | May 13 | Sept 27 |
| Hard freeze (28°F) | Every year | May 3 | Oct 4 |
Nights at 32°F or colder in an average year: 184
What to plant now in Mandan
- Spring planting calendar for an average last frost around May 10 Mandan: May 13
- Fall planting calendar for an average first frost around September 30 Mandan: September 27
Planting dates: USDA Home and Garden Bulletin No. 9 (1967), “Suburban and Farm Vegetable Gardens,” tables 4 and 5. How we match the table.
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