The information below is designed to provide freeze and frost information to those with temperature sensitive applications or needs. The top section provides operational forecasts and observations, while the lower half provides climatological probabilities and historical perspectives.
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7-Day Minimum Temperature Forecasts |
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| The maps below are courtesy of The Midwestern Regional Climate Center. |
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| Last 32° Freeze Map - SPRING |
Median Date of Last 32° Freeze
Based on 1981-2010 Average |
Last 28° Freeze Map - SPRING |
Median Date of Last 28° Freeze
Based on 1981-2010 Average |
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| First 32° Freeze Map - FALL |
Median Date of First 32° Freeze
Based on 1981-2010 Average |
First 28° Freeze Map - FALL |
Median Date of First 28° Freeze
Based on 1981-2010 Average |
Earliest and Latest "Freeze" Occurrences from 1981 to 2010. |
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Image not available |
| Earliest Date of Last 32° Freeze |
Latest Date of Last 32° Freeze |
Earliest Date of Last 28° Freeze |
Latest Date of Last 28° Freeze |
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The information in the tables below represent the average dates on which the prescribed temperatures occured - the climatological average first or last frost and freeze dates. Many variables dictate the actual first frost or freeze, including cloud cover, wind speed, soil moisture and location of the temperature sensor. Some temperature reporting sites are located in town while some are more rural. Sites in town tend to experience frosts and freezes a little later in the year, while rural sites tend to see frosts and have freezing temperatures a bit earlier. Based on 1981 - 2010 data.
| Climatological Freeze / Frost Date Information |
Fall Average Date of first Frost, Freeze or Hard Freeze at selected locations |
Spring Average Date of last Frost, Freeze or Hard Freeze at selected locations |
| North Dakota |
36F |
32F - 28F |
<=28F |
36F |
32F-36F |
<=28F |
| Casselton Agronomy Farm |
September 16 |
September 28 |
October 6 |
May 20 |
May 7 |
April 29 |
| Cavalier 7NW |
September 14 |
September 24 |
October 5 |
May 24 |
May 16 |
May 5 |
| Colgate |
September 12 |
September 23 |
October 3 |
May 22 |
May 13 |
May 4 |
| Cooperstown 5E |
September 8 |
September 20 |
September 30 |
May 27 |
May 16 |
May 6 |
| Devils Lake / KDLR |
September 20 |
September 28 |
October 6 |
May 19 |
May 10 |
April 30 |
| Edmore 1NW |
September 7 |
September 17 |
September 26 |
June 3 |
May 20 |
May 9 |
| Fargo Hector Field |
September 18 |
September 30 |
October 9 |
May 20 |
May 8 |
May 2 |
| Forman 5SSE |
September 18 |
September 28 |
October 6 |
May 18 |
May 6 |
April 26 |
| Grand Forks Airport |
September 13 |
September 21 |
October 6 |
May 24 |
May 12 |
May 2 |
| Hansboro 4NNW |
September 6 |
September 15 |
September 28 |
June 4 |
May 21 |
May 11 |
| Langdon NDSU Experiment Station |
September 10 |
September 19 |
September 29 |
May 12 |
May 20 |
May 9 |
| Petersburg 2N |
September 12 |
September 22 |
September 30 |
May 24 |
May 18 |
May 3 |
| University of North Dakota / NWS |
September 16 |
September 30 |
October 8 |
May 21 |
May 11 |
April 30 |
| Climatological Freeze / Frost Date Information |
Fall Average Date of a Frost, Freeze or Hard Freeze at selected locations |
Spring AverageDate of a Frost, Freeze or Hard Freeze at selected locations |
| Minnesota |
36F |
32F-28F |
<=28F |
36F |
32F-36F |
<=28F |
| Ada |
September 17 |
September 27 |
October 8 |
May 20 |
May 9 |
April 29 |
| Agassiz WLR |
September 10 |
September 25 |
October 6 |
May 30 |
May 17 |
May 4 |
| Argyle |
September 11 |
September 21 |
October 5 |
May 26 |
May 16 |
May 5 |
| Baudette |
September 13 |
September 23 |
October 3 |
May 30 |
May 16 |
May 3 |
| Crookston |
September 12 |
September 23 |
October 7 |
May 24 |
May 10 |
April 30 |
| Detroit Lakes |
September 8 |
September 20 |
October 4 |
May 29 |
May 16 |
May 2 |
| Fosston 1E |
September 4 |
September 19 |
September 29 |
June 4 |
May 17 |
May 5 |
| Itasca State park UMN |
September 14 |
September 22 |
October 4 |
June 2 |
May 22 |
May 9 |
| Red Lake Falls |
September 13 |
September 24 |
October 3 |
May 23 |
May 11 |
April 30 |
| Red Lake IA |
September 16 |
September 25 |
October 4 |
June 1 |
May 20 |
May 10 |
| Rothsay |
September 19 |
October 2 |
October 9 |
May 19 |
May 6 |
April 27 |
| Thorhult |
September 2 |
September 14 |
September 30 |
June 5 |
May 28 |
May 14 |
| Wadena 3S |
September 17 |
September 27 |
October 10 |
May 22 |
May 9 |
April 30 |
| Warroad |
September 14 |
September 26 |
October 10 |
May 26 |
May 15 |
May 5 |
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NOAA's 1981-2010 Climate Normals
NOAA's National Centers for Environmental Information (NCEI, formerly NCDC) released the 1981-2010 Normals on July 1, 2011. Climate Normals are the latest three-decade averages of climatological variables, including temperature and precipitation. This new product replaces the 1971-2000 Normals product. Additional Normals products; such as frost/freeze dates, growing degree days, population-weighting heating and cooling degree days, and climate division and gridded normals; will be provided in a supplemental release at a later date.
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