Frost dates
Frost dates in North Dakota
Typical last spring frost and first fall frost for 125 weather stations across North Dakota, from NOAA’s 1991–2020 climate normals.
Last spring frost
May 8 – May 20
Typical across North Dakota (middle: May 13)
First fall frost
Sep 21 – Oct 1
Typical across North Dakota (middle: Sep 27)
Your own yard can differ by weeks from the nearest town. Get frost dates for your exact spot →
By town
| Station | Last spring frost | First fall frost | Frost-free days |
|---|---|---|---|
| Almont | May 17 | Sep 21 | 127 |
| Amidon | May 12 | Sep 29 | 140 |
| Ashley | May 13 | Sep 28 | 138 |
| Beach | May 16 | Sep 26 | 133 |
| Belcourt Keya Radio | May 19 | Sep 24 | 128 |
| Beulah 1 W | May 21 | Sep 20 | 122 |
| Bismarck | May 14 | Sep 27 | 136 |
| Bismarck | May 14 | Sep 30 | 139 |
| Bismarck 2.4 NNW | May 10 | Sep 30 | 143 |
| Bottineau | May 15 | Sep 25 | 133 |
| Bowman | May 16 | Sep 25 | 132 |
| Breien | May 12 | Sep 24 | 135 |
| Butte 5 SE | May 16 | Sep 28 | 135 |
| Carrington | May 10 | Sep 28 | 141 |
| Carrington 4 N | May 12 | Sep 27 | 138 |
| Carson | May 19 | Sep 25 | 129 |
| Casselton Agronomy Farm | May 9 | Oct 1 | 145 |
| Cavalier 7 NW | May 12 | Sep 30 | 141 |
| Center 4 SE | May 11 | Sep 29 | 141 |
| Colgate | May 10 | Sep 24 | 137 |
| Cooperstown | May 17 | Sep 23 | 129 |
| Crosby | May 17 | Sep 23 | 129 |
| Devils Lake | May 12 | Sep 30 | 141 |
| Devils Lake Kdlr | May 6 | Oct 5 | 152 |
| Dickinson | May 20 | Sep 22 | 125 |
| Dickinson Rch HQ | May 18 | Sep 24 | 129 |
| Drake 9 NE | May 12 | Sep 27 | 138 |
| Dunn Ctr 1 E | May 20 | Sep 21 | 124 |
| Edgeley 3 WNW | May 7 | Oct 2 | 148 |
| Edmore 4 NW | May 15 | Sep 22 | 130 |
| Edmunds Arrowwood Ref | May 11 | Sep 28 | 140 |
| Ellendale | May 4 | Oct 2 | 151 |
| Enderlin 2 W | May 3 | Oct 5 | 155 |
| Esmond 9 NNW | May 11 | Sep 28 | 140 |
| Fairfield | May 12 | Sep 28 | 139 |
| Fargo 3 S | May 4 | Oct 2 | 151 |
| Fargo Hector International Airport | May 10 | Sep 30 | 143 |
| Fessenden | May 13 | Sep 28 | 138 |
| Flasher | May 13 | Sep 27 | 137 |
| Forman 5 SSE | May 7 | Oct 1 | 147 |
| Fortuna 1 W | May 19 | Sep 17 | 121 |
| Foxholm 7 N | May 11 | Sep 29 | 141 |
| Fullerton 1 ESE | May 9 | Sep 28 | 142 |
| Gackle | May 6 | Oct 4 | 151 |
| Garrison | May 12 | Sep 30 | 141 |
| Garrison | May 14 | Sep 26 | 135 |
| Grafton | May 4 | Oct 7 | 156 |
| Grand Forks International Airport | May 16 | Sep 27 | 134 |
| Grand Forks Univ (Nws) | May 10 | Oct 1 | 144 |
| Granville | May 9 | Oct 1 | 145 |
| Grassy Butte 2 ENE | May 18 | Sep 23 | 128 |
| Hansboro 4 NNE | May 18 | Sep 23 | 128 |
| Harvey 4 NE | May 12 | Sep 26 | 137 |
| Hazelton 4 NW | May 12 | Sep 27 | 138 |
| Heart Butte Dam | May 14 | Sep 29 | 138 |
| Hebron | May 19 | Sep 21 | 125 |
| Hettinger Experiment Station | May 21 | Sep 21 | 123 |
| Hettinger Municipal Airport | May 24 | Sep 18 | 117 |
| Hillsboro 3 N | May 2 | Oct 9 | 160 |
| Jamestown 38 WSW | May 14 | Sep 27 | 136 |
| Jamestown Municipal Airport | May 11 | Sep 28 | 140 |
| Jamestown State Hosp | May 8 | Sep 29 | 144 |
| Keene 3 S | May 20 | Sep 20 | 123 |
| Kenmare 1 WSW | May 15 | Sep 23 | 131 |
| Killdeer | May 21 | Sep 23 | 125 |
| La Moure | May 10 | Sep 28 | 141 |
| Lake Metigoshe Sp | May 17 | Sep 24 | 130 |
| Langdon Experiment Farm | May 17 | Sep 26 | 132 |
| Larimore 4 SW | May 11 | Sep 28 | 140 |
| Leeds | May 15 | Sep 27 | 135 |
| Lidgerwood | May 2 | Oct 6 | 157 |
| Linton | May 12 | Sep 29 | 140 |
| Lisbon | May 12 | Sep 27 | 138 |
| Mandan Experiment Station | May 13 | Sep 27 | 137 |
| Max | May 10 | Sep 28 | 141 |
| Mayville | May 13 | Sep 27 | 137 |
| Mc Clusky | May 8 | Oct 1 | 146 |
| Mc Henry 3 W | May 12 | Sep 28 | 139 |
| Mc Leod 3 E | May 6 | Sep 29 | 146 |
| Medora | May 19 | Sep 20 | 124 |
| Medora 7 E | May 9 | Sep 30 | 144 |
| Minnewaukan | May 12 | Sep 29 | 140 |
| Minot Experiment Station | May 13 | Sep 27 | 137 |
| Minot International Airport | May 10 | Oct 1 | 144 |
| Moffit 3 SE | May 11 | Sep 29 | 141 |
| Mohall | May 17 | Sep 23 | 129 |
| Mott | May 16 | Sep 25 | 132 |
| Napoleon | May 13 | Sep 28 | 138 |
| New England | May 16 | Sep 24 | 131 |
| New Salem 5 NW | May 18 | Sep 24 | 129 |
| Northgate 5 ESE | May 20 | Sep 19 | 122 |
| Oakes | May 8 | Sep 28 | 143 |
| Pembina | May 16 | Sep 29 | 136 |
| Petersburg 2 N | May 11 | Sep 28 | 140 |
| Powers Lake 1 N | May 18 | Sep 17 | 122 |
| Pretty Rock | May 20 | Sep 23 | 126 |
| Richardton Abbey | May 9 | Oct 1 | 145 |
| Riverdale | May 12 | Oct 3 | 144 |
| Rolette 3 SE | May 22 | Sep 20 | 121 |
| Rolla 1 NE | May 20 | Sep 26 | 129 |
| Rugby | May 17 | Sep 23 | 129 |
| Stanley 3 NNW | May 17 | Sep 23 | 129 |
| Steele 4 N | May 15 | Sep 25 | 133 |
| Streeter 5 NW | May 13 | Sep 30 | 140 |
| Taylor 7 NNW | May 23 | Sep 20 | 120 |
| Theodore Roosevelt Airport | May 18 | Sep 25 | 130 |
| Tioga 1 E | May 11 | Sep 26 | 138 |
| Towner 2 NE | May 17 | Sep 22 | 128 |
| Trotters 3 SSE | May 15 | Sep 25 | 133 |
| Turtle Lake | May 14 | Sep 26 | 135 |
| Tuttle 12 NNE | May 13 | Sep 29 | 139 |
| Underwood | May 10 | Sep 29 | 142 |
| Upham 3 N | May 15 | Sep 25 | 133 |
| Valley City 3 NNW | May 13 | Sep 26 | 136 |
| Velva | May 22 | Sep 22 | 123 |
| Washburn | May 12 | Sep 30 | 141 |
| Watford City | May 9 | Sep 27 | 141 |
| Watford City 14 S | May 22 | Sep 17 | 118 |
| Westhope | May 14 | Sep 25 | 134 |
| Wildrose 3 NW | May 18 | Sep 20 | 125 |
| Williston Experiment Farm | May 13 | Sep 26 | 136 |
| Williston Sloulin International Airport | May 21 | Sep 21 | 123 |
| Willow City | May 21 | Sep 20 | 122 |
| Wilton | May 11 | Sep 30 | 142 |
| Wishek | May 13 | Sep 27 | 137 |
Each date is the median: in half of years the frost comes earlier, in half later. Frost here means a low of 32°F or colder at the station. Low spots and valleys often frost a week or two earlier than these dates; hillsides and city centers later.
Source: NOAA National Centers for Environmental Information, U.S. Climate Normals 1991–2020. The Field almanac also shows how often frost comes early or late, and a reanalysis reading for your exact location.