Indiana frost dates: M
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Mackey | Apr 6 | Oct 30 | 207 d | 7a |
| Macy | Apr 23 | Oct 21 | 181 d | 6a |
| Madison | Apr 11 | Oct 31 | 203 d | 6b |
| Manilla | Apr 19 | Oct 23 | 187 d | 6a |
| Marengo | Apr 17 | Oct 19 | 185 d | 6b |
| Mariah Hill | Apr 11 | Oct 26 | 198 d | 7a |
| Marion | Apr 26 | Oct 20 | 177 d | 6a |
| Markle | Apr 24 | Oct 20 | 179 d | 6a |
| Markleville | Apr 19 | Oct 23 | 187 d | 6a |
| Marshall | Apr 30 | Oct 12 | 165 d | 6a |
| Martinsville | Apr 24 | Oct 15 | 174 d | 6a |
| Marysville | Apr 18 | Oct 20 | 185 d | 6b |
| Matthews | Apr 22 | Oct 22 | 183 d | 6a |
| Mauckport | Apr 19 | Oct 24 | 188 d | 7a |
| Maxwell | Apr 19 | Oct 22 | 186 d | 6a |
| Mays | Apr 19 | Oct 23 | 187 d | 6a |
| Mccordsville | Apr 18 | Oct 26 | 191 d | 6a |
| Mecca | Apr 30 | Oct 12 | 165 d | 6a |
| Medaryville | Apr 26 | Oct 17 | 174 d | 5b |
| Medora | Apr 17 | Oct 22 | 188 d | 6b |
| Mellott | Apr 22 | Oct 17 | 178 d | 6a |
| Memphis | Mar 31 | Nov 9 | 223 d | 7a |
| Mentone | Apr 28 | Oct 18 | 173 d | 6a |
| Merom | Apr 12 | Oct 22 | 193 d | 6b |
| Merrillville | Apr 29 | Oct 16 | 170 d | 6a |
| Metamora | Apr 20 | Oct 21 | 184 d | 6a |
| Mexico | Apr 20 | Oct 23 | 186 d | 6a |
| Miami | Apr 27 | Oct 18 | 174 d | 6a |
| Michigan City | Apr 19 | Oct 27 | 191 d | 6a |
| Michigantown | Apr 21 | Oct 21 | 183 d | 6a |
| Middlebury | Apr 28 | Oct 19 | 174 d | 6a |
| Middletown | Apr 19 | Oct 23 | 187 d | 6a |
| Midland | Apr 14 | Oct 26 | 195 d | 6a |
| Milan | Apr 30 | Oct 16 | 169 d | 6b |
| Milford | Apr 24 | Oct 24 | 183 d | 6a |
| Mill Creek | Apr 19 | Oct 27 | 191 d | 6a |
| Millersburg | Apr 28 | Oct 19 | 174 d | 6a |
| Millhousen | Apr 15 | Oct 26 | 194 d | 6b |
| Milltown | Apr 17 | Oct 19 | 185 d | 6b |
| Milroy | Apr 19 | Oct 23 | 187 d | 6a |
| Milton | Apr 27 | Oct 9 | 165 d | 6a |
| Mishawaka | Apr 23 | Oct 23 | 183 d | 6a |
| Mitchell | Apr 20 | Oct 20 | 183 d | 6b |
| Modoc | Apr 20 | Oct 21 | 184 d | 6a |
| Mongo | Apr 26 | Oct 21 | 178 d | 6a |
| Monon | Apr 26 | Oct 17 | 174 d | 5b |
| Monroe | Apr 23 | Oct 22 | 182 d | 6a |
| Monroe City | Apr 10 | Oct 25 | 198 d | 6b |
| Monroeville | Apr 23 | Oct 19 | 179 d | 6a |
| Monrovia | Apr 24 | Oct 15 | 174 d | 6a |
| Monterey | Apr 25 | Oct 18 | 176 d | 6a |
| Montezuma | Apr 30 | Oct 12 | 165 d | 6a |
| Montgomery | Apr 10 | Oct 25 | 198 d | 6b |
| Monticello | Apr 22 | Oct 17 | 178 d | 6a |
| Montmorenci | Apr 26 | Oct 12 | 169 d | 6a |
| Montpelier | Apr 22 | Oct 22 | 183 d | 6a |
| Mooreland | Apr 27 | Oct 9 | 165 d | 6a |
| Moores Hill | Apr 30 | Oct 16 | 169 d | 6b |
| Mooresville | Apr 12 | Oct 27 | 198 d | 6a |
| Morgantown | Apr 24 | Oct 15 | 174 d | 6b |
| Morocco | Apr 23 | Oct 18 | 178 d | 5b |
| Morris | Apr 30 | Oct 16 | 169 d | 6b |
| Morristown | Apr 14 | Oct 23 | 192 d | 6a |
| Mount Ayr | Apr 23 | Oct 18 | 178 d | 6a |
| Mount Saint Francis | Mar 31 | Nov 9 | 223 d | 6b |
| Mount Summit | Apr 27 | Oct 17 | 173 d | 6a |
| Mount Vernon | Apr 7 | Oct 28 | 204 d | 7a |
| Mulberry | Apr 21 | Oct 21 | 183 d | 6a |
| Muncie | Apr 16 | Oct 25 | 192 d | 6a |
| Munster | Apr 23 | Oct 20 | 180 d | 6a |