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Frost Date Finder

NOAA 1991–2020 freeze normals

Frost Dates in North Dakota

Last and first frost at the 34 NOAA stations behind this site's North Dakota pages.

At the middle station of the 34 in North Dakota where a freeze comes every year, the last spring frost (50%) is May 12 and the first fall frost September 27, a freeze-free season of 137 days. The last frost is earliest at Hillsboro (Hillsboro 3 N, ND, May 2) and latest at Hazen (Beulah 1 W, ND, May 21), 19 days apart. The season runs from 121 days at New Town to 158 at Hillsboro.

25 of these stations were also in NOAA's previous normals, for 1981–2010. Between the two, the median station's freeze-free season grew 4 days longer and the first fall frost 2 days later; the season lengthened at 20 stations and shortened at 4. The two periods share twenty years, so the change reflects mostly 2011–2020 against 1981–1990.

North Dakota places by frost date

Frost dates of the North Dakota places with a page, largest first
PlaceZIPLast frostFirst frostSeasonWinters with 32°F
Fargo58103May 4October 2151 d100%
Grand Forks58201May 10October 1144 d100%
West Fargo58078May 10September 30143 d100%
Bismarck58503May 10September 30142 d100%
Williston58801May 21September 21123 d100%
Minot58701May 13September 27136 d100%
Bismarck58504May 14September 30138 d100%
Dickinson58601May 20September 22123 d100%
Mandan58554May 13September 27136 d100%
Minot58703May 10October 1144 d100%
Jamestown58401May 8September 29143 d100%
Devils Lake58301May 12September 30141 d100%
Watford City58854May 9September 27139 d100%
Wahpeton58075May 4October 3152 d100%
Valley City58072May 13September 26136 d100%
Belcourt58316May 19September 24126 d100%
Grafton58237May 4October 7156 d100%
New Town58763May 20September 20121 d100%
Bottineau58318May 15September 25133 d100%
Lisbon58054May 12September 27136 d100%
Hazen58545May 21September 20121 d100%
Rugby58368May 17September 23129 d100%
Carrington58421May 10September 28139 d100%
Garrison58540May 14September 26133 d100%
Casselton58012May 9October 1143 d100%
Oakes58474May 8September 28144 d100%
Stanley58784May 17September 23127 d100%
Harvey58341May 12September 26135 d100%
Langdon58249May 17September 26132 d100%
Mayville58257May 13September 27136 d100%
Cavalier58220May 12September 30139 d100%
Hillsboro58045May 2October 9158 d100%
Fort Yates58538May 12September 28137 d100%
Tioga58852May 11September 26136 d100%

50% dates from NOAA NCEI U.S. Climate Normals 1991–2020, one row per station; a state page is published when at least 5 stations stand behind its pages. Where a freeze comes in fewer than nine winters in ten, the dates describe the winters that have one.