Massachusetts frost dates: M
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Malden | Apr 4 | Nov 9 | 219 d | 6b |
| Manchaug | May 1 | Oct 10 | 162 d | 6b |
| Manchester | May 4 | Oct 12 | 161 d | 7a |
| Manomet | Apr 30 | Oct 16 | 169 d | 7a |
| Mansfield | Apr 27 | Oct 15 | 171 d | 6b |
| Marblehead | Apr 25 | Oct 20 | 178 d | 7a |
| Marion | Apr 21 | Oct 24 | 186 d | 7a |
| Marlborough | May 2 | Oct 6 | 157 d | 6b |
| Marshfield | Apr 15 | Nov 1 | 200 d | 7a |
| Marshfield Hills | Apr 25 | Oct 22 | 180 d | 7a |
| Marstons Mills | Apr 26 | Oct 26 | 183 d | 7a |
| Mashpee | Apr 26 | Oct 26 | 183 d | 7a |
| Mattapan | Apr 19 | Oct 23 | 187 d | 6b |
| Mattapoisett | Apr 11 | Nov 5 | 208 d | 7a |
| Maynard | May 2 | Oct 6 | 157 d | 6b |
| Medfield | Apr 27 | Oct 14 | 170 d | 6b |
| Medford | Apr 4 | Nov 9 | 219 d | 6b |
| Medway | Apr 30 | Oct 9 | 162 d | 6b |
| Melrose | Apr 25 | Oct 17 | 175 d | 6b |
| Mendon | Apr 30 | Oct 9 | 162 d | 6b |
| Menemsha | May 7 | Oct 9 | 155 d | 7b |
| Merrimac | May 1 | Oct 12 | 164 d | 6a |
| Methuen | Apr 13 | Oct 28 | 198 d | 6b |
| Middleboro | Apr 23 | Oct 16 | 176 d | 6b |
| Middlefield | May 13 | Oct 2 | 142 d | 6a |
| Middleton | May 3 | Oct 9 | 159 d | 6b |
| Milford | Apr 30 | Oct 9 | 162 d | 6b |
| Mill River | May 3 | Oct 11 | 161 d | 5b |
| Millbury | Apr 23 | Oct 21 | 181 d | 6a |
| Millers Falls | May 1 | Oct 11 | 163 d | 6a |
| Millis | Apr 30 | Oct 9 | 162 d | 6b |
| Millville | Apr 22 | Oct 19 | 180 d | 6b |
| Milton | Apr 18 | Oct 26 | 191 d | 6b |
| Milton Village | Apr 19 | Oct 23 | 187 d | 6b |
| Minot | Apr 25 | Oct 22 | 180 d | 7a |
| Monponsett | May 1 | Oct 9 | 161 d | 6b |
| Monroe Bridge | May 14 | Oct 4 | 143 d | 5b |
| Monson | May 7 | Oct 12 | 158 d | 6a |
| Montague | May 1 | Oct 11 | 163 d | 6a |
| Monterey | May 7 | Oct 3 | 149 d | 5b |
| Monument Beach | Apr 21 | Oct 24 | 186 d | 7a |