North Dakota frost dates: M
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Maddock | May 12 | Sep 29 | 140 d | 4a |
| Maida | May 17 | Sep 26 | 132 d | 3b |
| Makoti | May 10 | Sep 28 | 141 d | 4a |
| Mandan | May 13 | Sep 27 | 137 d | 4a |
| Mandaree | May 20 | Sep 20 | 123 d | 4a |
| Manning | May 18 | Sep 24 | 129 d | 4a |
| Mantador | May 2 | Oct 6 | 157 d | 4a |
| Manvel | May 16 | Sep 27 | 134 d | 4a |
| Mapleton | May 9 | Oct 1 | 145 d | 4a |
| Marion | May 10 | Sep 28 | 141 d | 4b |
| Marmarth | May 16 | Sep 26 | 133 d | 4a |
| Marshall | May 23 | Sep 20 | 120 d | 4a |
| Martin | May 12 | Sep 26 | 137 d | 4a |
| Max | May 10 | Sep 28 | 141 d | 4a |
| Maxbass | May 17 | Sep 23 | 129 d | 3b |
| Mayville | May 13 | Sep 27 | 137 d | 4a |
| Mcclusky | May 8 | Oct 1 | 146 d | 4b |
| Mcgregor | May 18 | Sep 17 | 122 d | 3b |
| Mchenry | May 12 | Sep 28 | 139 d | 4a |
| Mcleod | May 6 | Sep 29 | 146 d | 4a |
| Mcville | May 11 | Sep 28 | 140 d | 4a |
| Medina | May 14 | Sep 27 | 136 d | 4a |
| Medora | May 19 | Sep 20 | 124 d | 4a |
| Mekinock | May 16 | Sep 27 | 134 d | 4a |
| Menoken | May 14 | Sep 30 | 139 d | 4a |
| Mercer | May 14 | Sep 26 | 135 d | 4a |
| Michigan | May 11 | Sep 28 | 140 d | 4a |
| Milnor | May 7 | Oct 1 | 147 d | 4a |
| Milton | May 17 | Sep 26 | 132 d | 3b |
| Minnewaukan | May 12 | Sep 29 | 140 d | 4a |
| Minot | May 10 | Oct 1 | 144 d | 4a |
| Minot Afb | May 11 | Sep 29 | 141 d | 4a |
| Minto | May 4 | Oct 7 | 156 d | 4a |
| Moffit | May 11 | Sep 29 | 141 d | 4a |
| Mohall | May 17 | Sep 23 | 129 d | 4a |
| Montpelier | May 8 | Sep 29 | 144 d | 4b |
| Mooreton | May 4 | Oct 3 | 152 d | 4a |
| Mott | May 16 | Sep 25 | 132 d | 4a |
| Mountain | May 12 | Sep 30 | 141 d | 4a |
| Munich | May 15 | Sep 22 | 130 d | 3b |
| Mylo | May 22 | Sep 20 | 121 d | 3b |