Last frost date in Bismarck, North Dakota
May 10
Average last frost in spring. In an early year (1 in 10) it's over by April 30; in a late year (1 in 10) it comes after May 23.
September 30
Average first frost in fall. 1 year in 10 it comes by September 16.
Source: NOAA U.S. Climate Normals 1991–2020, station Bismarck 2.4 Nnw (USC00320817), 1.8 miles from Bismarck, elevation 1,831 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 30 | May 10 | May 23 |
| First frost in fall | Sept 16 | Sept 30 | Oct 13 |
Frost-free days in an average year: 142
| Chance in a year | Average last in spring | Average first in fall | |
|---|---|---|---|
| Light frost (36°F) | Every year | May 20 | Sept 21 |
| Frost (32°F) | Every year | May 10 | Sept 30 |
| Hard freeze (28°F) | Every year | May 1 | Oct 9 |
Nights at 32°F or colder in an average year: 181
What to plant now in Bismarck
- Spring planting calendar for an average last frost around May 10 Bismarck: May 10
- Fall planting calendar for an average first frost around September 30 Bismarck: September 30
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
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