| City | Population | Last spring frost | First fall frost | Growing season | Zone |
|---|---|---|---|---|---|
| Fargo | 136,275 | May 4 | Oct 2 | 151 days | 4a |
| Bismarck | 77,963 | May 10 | Sep 30 | 142 days | 4a |
| Grand Forks | 60,365 | May 10 | Oct 1 | 144 days | 4a |
| Minot | 47,308 | May 10 | Oct 1 | 144 days | 4a |
| West Fargo | 41,175 | May 4 | Oct 2 | 151 days | 4a |
| Williston | 29,522 | May 21 | Sep 21 | 123 days | 4a |
| Dickinson | 25,870 | May 20 | Sep 22 | 123 days | 4b |
| Mandan | 25,061 | May 13 | Sep 27 | 136 days | 4a |
| Jamestown | 15,688 | May 8 | Sep 29 | 143 days | 4b |
| Wahpeton | 8,141 | May 4 | Oct 3 | 152 days | 4a |
| Devils Lake | 7,333 | May 6 | Oct 5 | 152 days | 4a |
| Horace | 7,001 | May 4 | Oct 2 | 151 days | 4a |
| Valley City | 6,430 | May 13 | Sep 26 | 136 days | 4a |
| Watford City | 6,378 | May 9 | Sep 27 | 139 days | 4a |