Missouri frost dates: M
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Macks Creek | Apr 7 | Oct 28 | 204 d | 6b |
| Macomb | Apr 11 | Oct 26 | 198 d | 7a |
| Macon | Apr 8 | Oct 28 | 203 d | 6a |
| Madison | Apr 13 | Oct 25 | 195 d | 6b |
| Maitland | Apr 16 | Oct 20 | 187 d | 6a |
| Malden | Mar 29 | Nov 3 | 219 d | 7b |
| Malta Bend | Apr 10 | Oct 24 | 197 d | 6b |
| Mansfield | Apr 11 | Oct 26 | 198 d | 7a |
| Mapaville | Apr 9 | Oct 26 | 200 d | 6b |
| Marble Hill | Apr 12 | Oct 23 | 194 d | 6b |
| Marceline | Apr 14 | Oct 23 | 192 d | 6a |
| Marionville | Apr 15 | Oct 23 | 191 d | 7a |
| Marquand | Apr 21 | Oct 16 | 178 d | 6b |
| Marshall | Apr 10 | Oct 24 | 197 d | 6b |
| Marshfield | Apr 13 | Oct 24 | 194 d | 6b |
| Marston | Mar 28 | Nov 3 | 220 d | 7b |
| Marthasville | Apr 8 | Oct 25 | 200 d | 6b |
| Martinsburg | Apr 11 | Oct 25 | 197 d | 6b |
| Martinsville | Apr 16 | Oct 22 | 189 d | 5b |
| Maryland Heights | Apr 2 | Nov 4 | 216 d | 7a |
| Maryville | Apr 19 | Oct 17 | 181 d | 5b |
| Matthews | Mar 28 | Nov 3 | 220 d | 7b |
| Maysville | Apr 19 | Oct 19 | 183 d | 6a |
| Mayview | Apr 10 | Oct 24 | 197 d | 6b |
| Maywood | Apr 8 | Oct 30 | 205 d | 6a |
| Mc Bride | Apr 19 | Oct 20 | 184 d | 6b |
| Mc Fall | Apr 17 | Oct 21 | 187 d | 6a |
| Mc Gee | Apr 2 | Nov 2 | 214 d | 7a |
| Mc Girk | Apr 11 | Oct 25 | 197 d | 6b |
| Meadville | Apr 16 | Oct 20 | 187 d | 6a |
| Memphis | Apr 23 | Oct 17 | 177 d | 6a |
| Mendon | Apr 10 | Oct 29 | 202 d | 6a |
| Mercer | Apr 25 | Oct 15 | 173 d | 5b |
| Meta | Apr 8 | Oct 26 | 201 d | 6b |
| Metz | Apr 7 | Oct 27 | 203 d | 6b |
| Mexico | Apr 11 | Oct 25 | 197 d | 6b |
| Miami | Apr 10 | Oct 24 | 197 d | 6b |
| Mid Missouri | Apr 7 | Oct 29 | 205 d | 6b |
| Middle Brook | Apr 9 | Oct 26 | 200 d | 6b |
| Middletown | Apr 11 | Oct 23 | 195 d | 6b |
| Milan | Apr 26 | Oct 14 | 171 d | 6a |
| Milford | Apr 9 | Oct 27 | 201 d | 7a |
| Mill Spring | Apr 9 | Oct 26 | 200 d | 7a |
| Miller | Apr 14 | Oct 21 | 190 d | 7a |
| Millersville | Apr 7 | Oct 29 | 205 d | 7a |
| Milo | Apr 7 | Oct 27 | 203 d | 7a |
| Mindenmines | Apr 6 | Oct 24 | 201 d | 7a |
| Mineral Point | Apr 11 | Oct 28 | 200 d | 6b |
| Missouri City | Apr 19 | Oct 17 | 181 d | 6a |
| Moberly | Apr 13 | Oct 25 | 195 d | 6b |
| Mokane | Apr 10 | Oct 24 | 197 d | 6b |
| Monett | Apr 9 | Oct 26 | 200 d | 7a |
| Monroe City | Apr 12 | Oct 22 | 193 d | 6a |
| Montgomery City | Apr 14 | Oct 23 | 192 d | 6b |
| Monticello | Apr 11 | Oct 23 | 195 d | 6a |
| Montier | Apr 22 | Oct 18 | 179 d | 7a |
| Montreal | Apr 8 | Oct 28 | 203 d | 6b |
| Montrose | Apr 7 | Oct 29 | 205 d | 6b |
| Moody | Apr 16 | Oct 21 | 188 d | 7a |
| Mooresville | Apr 15 | Oct 21 | 189 d | 6a |
| Mora | Apr 13 | Oct 23 | 193 d | 6b |
| Morehouse | Mar 26 | Nov 6 | 225 d | 7b |
| Morley | Mar 26 | Nov 6 | 225 d | 7a |
| Morrison | Apr 11 | Oct 21 | 193 d | 6b |
| Morrisville | Apr 14 | Oct 23 | 192 d | 6b |
| Morse Mill | Apr 9 | Oct 26 | 200 d | 6b |
| Mosby | Apr 19 | Oct 17 | 181 d | 6a |
| Moscow Mills | Apr 14 | Oct 23 | 192 d | 6b |
| Mound City | Apr 16 | Oct 20 | 187 d | 6a |
| Moundville | Apr 7 | Oct 27 | 203 d | 7a |
| Mount Sterling | Apr 11 | Oct 21 | 193 d | 6b |
| Mount Vernon | Apr 14 | Oct 21 | 190 d | 7a |
| Mountain Grove | Apr 11 | Oct 28 | 200 d | 7a |
| Mountain View | Apr 7 | Oct 27 | 203 d | 7a |
| Myrtle | Apr 17 | Oct 21 | 187 d | 7a |