Frost dates · North Dakota
When is the first frost in Bismarck?
Bismarck right now
36°FClear skies
- Today41°F / 36°FClouds
- Tomorrow51°F / 36°FClear skies
- Monday52°F / 32°FClouds
Clear skies, for now.
Live from OpenWeatherMap. Alerts from the National Weather Service.
In a typical year, Bismarck’s first frost comes around September 27 and its last around May 14.
One year in ten the first frost comes as early as September 15, and nine years in ten it has arrived by October 9. One year in ten the last frost is over as early as May 1, and nine years in ten it is over by May 27. Bismarck averages about 184 nights a year at 32°F or colder, with about 136 frost-free days in between in a typical year. It’s frost season here, and the last frost usually comes around May 14. That makes it the 5th earliest first frost of the 117 cities we track where it freezes most years.
Last updated
No freeze in the forecast for the next 48 hours.
Bismarck freezes on half the nights of the year and treats the other half as a brief intermission.
Live 48-hour check from OpenWeatherMap, refreshed about every half hour. Alerts from the National Weather Service.
Frost dates, early, typical and late years
| Early year (1 in 10) | Typical | Late year (1 in 10) | |
|---|---|---|---|
| First frost | September 15 | September 27 | October 9 |
| Last frost | May 1 | May 14 | May 27 |
A frost date here is a night when the official thermometer reads 32°F or colder. Frost on the ground can show up on clear, calm nights a few degrees milder.
Cities with about the same first frost
- Flagstaff, Arizona: first frost around September 28
- Missoula, Montana: first frost around September 26
- Fargo, North Dakota: first frost around September 30
Source: NOAA U.S. Climate Normals, 1991 to 2020, station USW00024011.