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North Dakota frost dates

Across 125 NOAA climate stations in North Dakota, the median last spring frost (32°F) ranges from May 2 at Hillsboro 3 N to May 24 at Hettinger Muni AP; the typical station sees its last frost around May 13 and its first fall frost around Sep 27.

“Median” dates have a 50% chance of a later spring frost or an earlier fall frost. “10% risk” dates are the safer choice for tender plants: only 1 year in 10 has frost beyond them. Source: NOAA NCEI 1991–2020 Climate Normals. Elevation matters: within a state, frost dates can differ by a month or more between valleys and hills.

StationElevationLast frost (median)Last frost (10% risk)First frost (median)First frost (10% risk)Growing season
Almont1,915 ftMay 17Jun 1Sep 21Sep 6124 days
Amidon2,910 ftMay 12May 28Sep 29Sep 14136 days
Ashley2,014 ftMay 13May 26Sep 28Sep 15137 days
Beach2,800 ftMay 16May 30Sep 26Sep 10130 days
Belcourt Keya Radio1,960 ftMay 19Jun 1Sep 24Sep 10126 days
Beulah 1 W1,785 ftMay 21Jun 3Sep 20Sep 5121 days
Bismarck1,658 ftMay 14May 27Sep 27Sep 15136 days
Bismarck 2.4 Nnw1,831 ftMay 10May 23Sep 30Sep 16142 days
Bismarck Wfo1,651 ftMay 14May 27Sep 30Sep 18138 days
Bottineau1,619 ftMay 15May 28Sep 25Sep 13133 days
Bowman2,983 ftMay 16May 29Sep 25Sep 11132 days
Breien1,720 ftMay 12May 27Sep 24Sep 11134 days
Butte 5SE1,720 ftMay 16May 31Sep 28Sep 13134 days
Carrington1,586 ftMay 10May 23Sep 28Sep 17139 days
Carrington 4 N1,560 ftMay 12May 25Sep 27Sep 17137 days
Carson2,335 ftMay 19Jun 1Sep 25Sep 11127 days
Casselton Agronomy Farm935 ftMay 9May 21Oct 1Sep 17143 days
Cavalier 7NW899 ftMay 12May 27Sep 30Sep 17139 days
Center 4SE1,990 ftMay 11May 26Sep 29Sep 15140 days
Colgate1,180 ftMay 10May 25Sep 24Sep 13136 days
Cooperstown1,380 ftMay 17Jun 1Sep 23Sep 10128 days
Crosby1,959 ftMay 17May 28Sep 23Sep 11128 days
Devils Lake1,440 ftMay 12May 24Sep 30Sep 19141 days
Devils Lake Kdlr1,464 ftMay 6May 19Oct 5Sep 26152 days
Dickinson2,460 ftMay 20Jun 1Sep 22Sep 8123 days
Dickinson Rch Hq2,380 ftMay 18May 31Sep 24Sep 11127 days
Drake 9 Ne1,547 ftMay 12May 25Sep 27Sep 16137 days
Dunn Ctr 1E2,187 ftMay 20Jun 1Sep 21Sep 7125 days
Edgeley 3WNW1,623 ftMay 7May 20Oct 2Sep 21148 days
Edmore 4NW1,539 ftMay 15May 31Sep 22Sep 11128 days
Edmunds Arrowwood Ref1,460 ftMay 11May 25Sep 28Sep 16139 days
Ellendale1,455 ftMay 4May 17Oct 2Sep 21149 days
Enderlin 2W1,164 ftMay 3May 16Oct 5Sep 23155 days
Esmond 9 Nnw1,632 ftMay 11May 23Sep 28Sep 18138 days
Fairfield2,750 ftMay 12May 27Sep 28Sep 13138 days
Fargo 3S908 ftMay 4May 18Oct 2Sep 22151 days
Fargo Hector Intl AP900 ftMay 10May 23Sep 30Sep 18143 days
Fessenden1,620 ftMay 13May 26Sep 28Sep 15139 days
Flasher1,980 ftMay 13May 28Sep 27Sep 15135 days
Forman 5 Sse1,250 ftMay 7May 20Oct 1Sep 18146 days
Fortuna 1 W2,350 ftMay 19May 31Sep 17Sep 4121 days
Foxholm 7 N1,675 ftMay 11May 29Sep 29Sep 13138 days
Fullerton 1 Ese1,435 ftMay 9May 23Sep 28Sep 17141 days
Gackle1,951 ftMay 6May 19Oct 4Sep 23150 days
Garrison1,932 ftMay 12May 24Sep 30Sep 17140 days
Garrison1,910 ftMay 14May 28Sep 26Sep 13133 days
Grafton827 ftMay 4May 18Oct 7Sep 25156 days
Grand Forks Intl AP842 ftMay 16May 31Sep 27Sep 15133 days
Grand Forks Univ (NWS)830 ftMay 10May 24Oct 1Sep 20144 days
Granville1,510 ftMay 9May 22Oct 1Sep 19145 days
Grassy Butte 2ENE2,670 ftMay 18Jun 1Sep 23Sep 9125 days
Hansboro 4 Nne1,540 ftMay 18May 31Sep 23Sep 11127 days
Harvey 4NE1,611 ftMay 12May 25Sep 26Sep 14135 days
Hazelton 4NW1,982 ftMay 12May 27Sep 27Sep 15136 days
Heart Butte Dam2,134 ftMay 14May 28Sep 29Sep 16136 days
Hebron2,160 ftMay 19Jun 2Sep 21Sep 7123 days
Hettinger Exp Stn2,703 ftMay 21Jun 5Sep 21Sep 5120 days
Hettinger Muni AP2,705 ftMay 24Jun 10Sep 18Sep 1115 days
Hillsboro 3 N910 ftMay 2May 17Oct 9Sep 25158 days
Jamestown 38 Wsw1,920 ftMay 14May 26Sep 27Sep 15135 days
Jamestown Muni AP1,494 ftMay 11May 24Sep 28Sep 15138 days
Jamestown State Hosp1,467 ftMay 8May 21Sep 29Sep 17143 days
Keene 3S2,470 ftMay 20Jun 2Sep 20Sep 5121 days
Kenmare 1 Wsw1,810 ftMay 15May 28Sep 23Sep 10129 days
Killdeer2,310 ftMay 21Jun 5Sep 23Sep 8124 days
La Moure1,334 ftMay 10May 22Sep 28Sep 18140 days
Lake Metigoshe Sp2,142 ftMay 17May 30Sep 24Sep 12130 days
Langdon Exp Farm1,615 ftMay 17May 30Sep 26Sep 13132 days
Larimore 4SW1,152 ftMay 11May 25Sep 28Sep 16139 days
Leeds1,530 ftMay 15May 27Sep 27Sep 14133 days
Lidgerwood1,125 ftMay 2May 15Oct 6Sep 25157 days
Linton1,690 ftMay 12May 26Sep 29Sep 15138 days
Lisbon1,149 ftMay 12May 23Sep 27Sep 14136 days
Mandan Exp Stn1,750 ftMay 13May 26Sep 27Sep 15136 days
Max2,110 ftMay 10May 25Sep 28Sep 15141 days
Mayville983 ftMay 13May 25Sep 27Sep 14136 days
Mc Clusky1,927 ftMay 8May 20Oct 1Sep 19145 days
Mc Henry 3W1,555 ftMay 12May 25Sep 28Sep 16139 days
Mc Leod 3 E1,075 ftMay 6May 19Sep 29Sep 18145 days
Medora2,268 ftMay 19Jun 1Sep 20Sep 6123 days
Medora 7 E2,771 ftMay 9May 21Sep 30Sep 15142 days
Minnewaukan1,470 ftMay 12May 25Sep 29Sep 17138 days
Minot Exp Stn1,769 ftMay 13May 26Sep 27Sep 14136 days
Minot Intl AP1,665 ftMay 10May 22Oct 1Sep 19144 days
Moffit 3 Se1,800 ftMay 11May 27Sep 29Sep 15139 days
Mohall1,641 ftMay 17May 30Sep 23Sep 11127 days
Mott2,426 ftMay 16May 30Sep 25Sep 11129 days
Napoleon1,980 ftMay 13May 26Sep 28Sep 15136 days
New England2,600 ftMay 16May 29Sep 24Sep 10128 days
New Salem 5NW2,150 ftMay 18Jun 1Sep 24Sep 12127 days
Northgate 5 Ese1,842 ftMay 20Jun 2Sep 19Sep 7121 days
Oakes1,324 ftMay 8May 21Sep 28Sep 16144 days
Pembina790 ftMay 16May 31Sep 29Sep 17137 days
Petersburg 2 N1,532 ftMay 11May 25Sep 28Sep 16138 days
Powers Lake 1N2,205 ftMay 18Jun 1Sep 17Sep 4119 days
Pretty Rock2,480 ftMay 20Jun 3Sep 23Sep 8124 days
Richardton Abbey2,470 ftMay 9May 23Oct 1Sep 18145 days
Riverdale1,962 ftMay 12May 27Oct 3Sep 20143 days
Rolette 3SE1,620 ftMay 22Jun 3Sep 20Sep 5120 days
Rolla 1NE1,833 ftMay 20May 31Sep 26Sep 14128 days
Rugby1,550 ftMay 17May 31Sep 23Sep 11129 days
Stanley 3 Nnw2,280 ftMay 17May 29Sep 23Sep 12127 days
Steele 4N1,853 ftMay 15May 28Sep 25Sep 12133 days
Streeter 5 Nw1,961 ftMay 13May 27Sep 30Sep 16139 days
Taylor 7 Nnw2,220 ftMay 23Jun 5Sep 20Sep 4119 days
Theodore Roosevelt AP2,580 ftMay 18May 31Sep 25Sep 12129 days
Tioga 1E2,245 ftMay 11May 24Sep 26Sep 13136 days
Towner 2 Ne1,480 ftMay 17Jun 1Sep 22Sep 10126 days
Trotters 3 Sse2,420 ftMay 15May 29Sep 25Sep 13132 days
Turtle Lake1,893 ftMay 14May 26Sep 26Sep 15136 days
Tuttle 12NNE2,100 ftMay 13May 28Sep 29Sep 17139 days
Underwood2,045 ftMay 10May 25Sep 29Sep 17139 days
Upham 3 N1,425 ftMay 15May 26Sep 25Sep 13132 days
Valley City 3 Nnw1,210 ftMay 13May 25Sep 26Sep 14136 days
Velva1,510 ftMay 22Jun 3Sep 22Sep 10123 days
Washburn1,755 ftMay 12May 25Sep 30Sep 18140 days
Watford City2,170 ftMay 9May 22Sep 27Sep 15139 days
Watford City 14S2,027 ftMay 22Jun 7Sep 17Sep 5119 days
Westhope1,502 ftMay 14May 26Sep 25Sep 13133 days
Wildrose 3NW2,227 ftMay 18May 30Sep 20Sep 7124 days
Williston Exp Farm2,105 ftMay 13May 25Sep 26Sep 14135 days
Williston Sloulin Intl AP1,902 ftMay 21Jun 3Sep 21Sep 9123 days
Willow City1,473 ftMay 21Jun 1Sep 20Sep 5119 days
Wilton2,188 ftMay 11May 25Sep 30Sep 17142 days
Wishek2,037 ftMay 13May 28Sep 27Sep 15135 days
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