North Dakota frost dates
Median last spring frost and first fall frost for 372 places in North Dakota. Last frost ranges from May 2 in Barney to May 24 in Hettinger.
Largest cities
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Fargo | May 4 | Oct 2 | 151 d | 4a |
| Bismarck | May 10 | Sep 30 | 143 d | 4a |
| Grand Forks | May 10 | Oct 1 | 144 d | 4a |
| Minot | May 10 | Oct 1 | 144 d | 4a |
| West Fargo | May 10 | Sep 30 | 143 d | 4a |
| Williston | May 21 | Sep 21 | 123 d | 4a |
| Dickinson | May 18 | Sep 25 | 130 d | 4a |
| Mandan | May 13 | Sep 27 | 137 d | 4a |
| Jamestown | May 11 | Sep 28 | 140 d | 4b |
| Wahpeton | May 4 | Oct 3 | 152 d | 4a |
| Devils Lake | May 6 | Oct 5 | 152 d | 4a |
| Watford City | May 9 | Sep 27 | 141 d | 4a |
| Valley City | May 13 | Sep 26 | 136 d | 4a |
| Grafton | May 4 | Oct 7 | 156 d | 4a |
| Beulah | May 21 | Sep 20 | 122 d | 4a |
| Rugby | May 17 | Sep 23 | 129 d | 3b |
| Stanley | May 17 | Sep 23 | 129 d | 4a |
| Horace | May 4 | Oct 2 | 151 d | 4a |
| Casselton | May 9 | Oct 1 | 145 d | 4a |
| New Town | May 20 | Sep 20 | 123 d | 4a |
| Hazen | May 21 | Sep 20 | 122 d | 4a |
| Bottineau | May 15 | Sep 25 | 133 d | 3b |
| Lisbon | May 12 | Sep 27 | 138 d | 4a |
| Belcourt | May 19 | Sep 24 | 128 d | 3b |
| Carrington | May 10 | Sep 28 | 141 d | 4a |
| Mayville | May 13 | Sep 27 | 137 d | 4a |
| Oakes | May 8 | Sep 28 | 143 d | 4a |
| Langdon | May 17 | Sep 26 | 132 d | 3b |
| Harvey | May 13 | Sep 28 | 138 d | 4a |
| Bowman | May 16 | Sep 25 | 132 d | 4b |
| Tioga | May 11 | Sep 26 | 138 d | 3b |
| Hillsboro | May 2 | Oct 9 | 160 d | 4a |
| Garrison | May 14 | Sep 26 | 135 d | 4a |
| Crosby | May 17 | Sep 23 | 129 d | 4a |
| New Rockford | May 12 | Sep 28 | 139 d | 4a |
| Park River | May 4 | Oct 7 | 156 d | 4a |
| Surrey | May 10 | Oct 1 | 144 d | 4a |
| Rolla | May 20 | Sep 26 | 129 d | 3b |
| Larimore | May 11 | Sep 28 | 140 d | 4a |
| Washburn | May 12 | Sep 30 | 141 d | 4a |