NDSU Agriculture Average Frost Dates in North Dakota

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The following data were taken from the publication Climatography of the United States No. 20, Climatic Summaries for Selected Sites, 1951-1980.
Average Dates of a 50% probability
of a Killing Frost
(at 28 degrees F.)


City

Last in
Spring

First in
Fall

Ashley May 12 September 20
Bottineau May 12 September 25
Bowman May 3 September 30
Carrington May 6 September 29
Cavalier May 5 October 2
Cooperstown May 7 September 29
Crosby May 7 September 27
Dickinson FAA May 4 October 4
Ellendale May 4 October 6
Fargo May 5 October 4
Garrison May 7 September 29
Grafton May 6 September 29
Grand Forks FAA April 30 October 4
Hankinson April 29 October 12
Hettinger May 7 September 28
Hillsboro April 28 October 6
Jamestown FAA May 7 October 1
Kenmare May 5 September 26
Langdon May 15 September 21
Larimore May 5 October 4
Lisbon May 10 September 27
Mandan May 8 September 30
Mayville May 2 October 6
Mott May 10 September 23
Napoleon May 8 September 28
New Salem May 8 September 28
Park River May 5 October 3
Rolla May 7 October 2
Rugby May 4 October 2
Stanley May 9 September 21
Velva May 10 September 27
Wahpeton April 28 October 10
Washburn May 7 October 3
Wishek May 17 September 21

See the North Dakota State Climatologist Web Site for additional climatology information.

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