New Jersey frost dates: M
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Madison | Apr 18 | Oct 27 | 192 d | 7a |
| Magnolia | Apr 12 | Nov 1 | 203 d | 7b |
| Mahwah | Apr 19 | Oct 23 | 187 d | 7a |
| Malaga | Apr 11 | Nov 3 | 206 d | 7b |
| Manahawkin | Apr 1 | Nov 15 | 228 d | 7b |
| Manasquan | Apr 9 | Nov 3 | 208 d | 7b |
| Manchester Township | Apr 23 | Oct 20 | 180 d | 7a |
| Mantoloking | Apr 23 | Oct 20 | 180 d | 7b |
| Mantua | Apr 8 | Nov 1 | 207 d | 7b |
| Manville | Apr 30 | Oct 20 | 173 d | 7a |
| Maple Shade | Apr 12 | Nov 1 | 203 d | 7b |
| Maplewood | Apr 18 | Oct 27 | 192 d | 7a |
| Margate City | Mar 26 | Nov 22 | 241 d | 7b |
| Marlboro | Apr 17 | Oct 23 | 189 d | 7a |
| Marlton | Apr 15 | Oct 28 | 196 d | 7b |
| Marmora | Apr 24 | Oct 22 | 181 d | 7b |
| Martinsville | Apr 30 | Oct 20 | 173 d | 7a |
| Matawan | Apr 17 | Oct 23 | 189 d | 7b |
| Mauricetown | Apr 24 | Oct 23 | 182 d | 7b |
| Mays Landing | Apr 18 | Oct 29 | 194 d | 7a |
| Maywood | Apr 3 | Nov 4 | 215 d | 7b |
| Mc Afee | May 1 | Oct 12 | 164 d | 6b |
| Medford | Apr 28 | Oct 15 | 170 d | 7a |
| Mendham | Apr 26 | Oct 18 | 175 d | 6b |
| Merchantville | Apr 15 | Oct 31 | 199 d | 7b |
| Metuchen | Apr 11 | Oct 28 | 200 d | 7a |
| Mickleton | Apr 2 | Nov 10 | 222 d | 7b |
| Middlesex | Apr 11 | Oct 28 | 200 d | 7a |
| Middletown | Apr 9 | Nov 3 | 208 d | 7b |
| Middleville | Apr 24 | Oct 16 | 175 d | 6b |
| Midland Park | Apr 19 | Oct 23 | 187 d | 7a |
| Milford | Apr 29 | Oct 16 | 170 d | 7a |
| Millburn | Apr 18 | Oct 27 | 192 d | 7a |
| Millington | Apr 11 | Oct 28 | 200 d | 7a |
| Millstone Township | Apr 25 | Oct 16 | 174 d | 7a |
| Milltown | Apr 15 | Oct 26 | 194 d | 7a |
| Millville | Apr 24 | Oct 23 | 182 d | 7a |
| Milmay | Apr 24 | Oct 22 | 181 d | 7a |
| Mine Hill | Apr 17 | Oct 23 | 189 d | 6b |
| Minotola | Apr 24 | Oct 22 | 181 d | 7a |
| Mizpah | Apr 24 | Oct 22 | 181 d | 7a |
| Monmouth Beach | Apr 9 | Nov 3 | 208 d | 7b |
| Monmouth Junction | Apr 25 | Oct 16 | 174 d | 7a |
| Monroe Township | Apr 25 | Oct 16 | 174 d | 7a |
| Monroeville | Apr 11 | Nov 3 | 206 d | 7b |
| Montague | Apr 20 | Oct 20 | 183 d | 6b |
| Montclair | Apr 18 | Oct 24 | 189 d | 7a |
| Montvale | Apr 20 | Oct 26 | 189 d | 7a |
| Montville | Apr 17 | Oct 23 | 189 d | 7a |
| Moonachie | Apr 3 | Nov 4 | 215 d | 7b |
| Moorestown | Apr 12 | Nov 1 | 203 d | 7b |
| Morganville | Apr 17 | Oct 23 | 189 d | 7a |
| Morris Plains | Apr 17 | Oct 23 | 189 d | 6b |
| Morristown | Apr 17 | Oct 23 | 189 d | 7a |
| Mount Arlington | Apr 25 | Oct 19 | 177 d | 6b |
| Mount Ephraim | Mar 30 | Nov 17 | 232 d | 7b |
| Mount Freedom | Apr 17 | Oct 23 | 189 d | 6b |
| Mount Holly | Apr 15 | Oct 29 | 197 d | 7b |
| Mount Laurel | Apr 15 | Oct 28 | 196 d | 7b |
| Mount Royal | Apr 2 | Nov 10 | 222 d | 7b |
| Mount Tabor | Apr 17 | Oct 23 | 189 d | 6b |
| Mountain Lakes | Apr 17 | Oct 23 | 189 d | 6b |
| Mountainside | Apr 11 | Oct 31 | 203 d | 7a |
| Mullica Hill | Apr 8 | Nov 1 | 207 d | 7b |