Frost Dates & Planting Calendars in North Dakota
Typical last spring frost, first fall frost, and growing-season length for 20 cities in North Dakota, based on NOAA 1991–2020 climate normals. Click a city for its full frost-date summary, monthly temperature chart, and 42-crop planting calendar.
| City | Last Spring Frost (typical) | First Fall Frost (typical) | Growing Season | USDA Zone |
|---|---|---|---|---|
| Fargo | May 5 | October 3 | 150 days | 4a |
| Bismarck | May 10 | September 30 | 142 days | 4a |
| Grand Forks | May 10 | October 1 | 144 days | 4a |
| Minot | May 10 | October 1 | 144 days | 4a |
| West Fargo | May 10 | September 30 | 143 days | 4a |
| Williston | May 21 | September 21 | 123 days | 4a |
| Dickinson | May 20 | September 22 | 123 days | 4b |
| Mandan | May 13 | September 27 | 136 days | 4a |
| Jamestown | May 8 | September 29 | 143 days | 4b |
| Wahpeton | May 4 | October 3 | 152 days | 4a |
| Devils Lake | May 6 | October 5 | 152 days | 4a |
| Watford City | May 9 | September 27 | 139 days | 4a |
| Valley City | May 13 | September 26 | 136 days | 4a |
| Minot Air Force Base | May 11 | September 29 | 138 days | 4a |
| Grafton | May 4 | October 7 | 156 days | 4a |
| Lincoln | May 14 | September 30 | 138 days | 4a |
| Beulah | May 21 | September 20 | 121 days | 4a |
| Rugby | May 17 | September 23 | 129 days | 3b |
| Stanley | May 17 | September 23 | 127 days | 4a |
| Horace | May 4 | October 2 | 151 days | 4a |