Ohio frost dates: M
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Macedonia | Apr 30 | Oct 21 | 174 d | 6b |
| Macksburg | Apr 30 | Oct 14 | 167 d | 6b |
| Madison | Apr 15 | Nov 9 | 208 d | 6b |
| Magnetic Springs | Apr 19 | Oct 26 | 190 d | 6b |
| Magnolia | Apr 30 | Oct 15 | 168 d | 6b |
| Maineville | Apr 23 | Oct 18 | 178 d | 6b |
| Malaga | Apr 27 | Oct 22 | 178 d | 6b |
| Malinta | Apr 24 | Oct 21 | 180 d | 6a |
| Malta | Apr 27 | Oct 21 | 177 d | 6b |
| Malvern | May 2 | Oct 13 | 164 d | 6b |
| Manchester | Apr 18 | Oct 30 | 195 d | 6b |
| Mansfield | Apr 26 | Oct 22 | 179 d | 6a |
| Mantua | May 1 | Oct 20 | 172 d | 6a |
| Maple Heights | Apr 8 | Nov 12 | 218 d | 6b |
| Maplewood | Apr 27 | Oct 20 | 176 d | 6a |
| Marengo | Apr 27 | Oct 17 | 173 d | 6a |
| Maria Stein | Apr 27 | Oct 19 | 175 d | 6a |
| Marietta | Apr 18 | Oct 27 | 192 d | 6b |
| Marion | Apr 24 | Oct 20 | 179 d | 6a |
| Mark Center | Apr 28 | Oct 17 | 172 d | 6a |
| Marshallville | Apr 29 | Oct 14 | 168 d | 6a |
| Martel | Apr 26 | Oct 20 | 177 d | 6a |
| Martin | Apr 20 | Oct 27 | 190 d | 6b |
| Martins Ferry | Apr 20 | Oct 29 | 192 d | 6b |
| Martinsburg | May 2 | Oct 8 | 159 d | 6a |
| Martinsville | Apr 19 | Oct 22 | 186 d | 6b |
| Marysville | Apr 19 | Oct 26 | 190 d | 6a |
| Mason | Apr 23 | Oct 18 | 178 d | 6b |
| Massillon | Apr 24 | Oct 26 | 185 d | 6b |
| Masury | May 1 | Oct 17 | 169 d | 6a |
| Maumee | Apr 22 | Oct 24 | 185 d | 6b |
| Maximo | Apr 24 | Oct 26 | 185 d | 6a |
| Maynard | Apr 20 | Oct 29 | 192 d | 7a |
| Mc Arthur | Apr 27 | Oct 14 | 170 d | 6b |
| Mc Clure | Apr 24 | Oct 21 | 180 d | 6a |
| Mc Comb | Apr 24 | Oct 21 | 180 d | 6a |
| Mc Cutchenville | Apr 29 | Oct 17 | 171 d | 6a |
| Mc Dermott | Apr 21 | Oct 24 | 186 d | 6b |
| Mc Donald | May 8 | Oct 12 | 157 d | 6a |
| Mc Guffey | Apr 22 | Oct 24 | 185 d | 6a |
| Mcconnelsville | Apr 27 | Oct 21 | 177 d | 6b |
| Mechanicsburg | Apr 24 | Oct 19 | 178 d | 6a |
| Mechanicstown | May 2 | Oct 13 | 164 d | 6a |
| Medina | Apr 29 | Oct 19 | 173 d | 6a |
| Medway | Apr 24 | Oct 17 | 176 d | 6b |
| Melmore | Apr 23 | Oct 23 | 183 d | 6a |
| Melrose | Apr 25 | Oct 19 | 177 d | 6a |
| Mendon | Apr 27 | Oct 19 | 175 d | 6a |
| Mentor | Apr 26 | Oct 31 | 188 d | 7a |
| Mesopotamia | May 1 | Oct 20 | 172 d | 6a |
| Metamora | Apr 22 | Oct 24 | 185 d | 6a |
| Miamisburg | Apr 18 | Oct 25 | 190 d | 6b |
| Miamitown | Apr 16 | Oct 28 | 195 d | 6b |
| Miamiville | Apr 23 | Oct 18 | 178 d | 6b |
| Middle Bass | Apr 10 | Nov 5 | 209 d | 7a |
| Middle Point | Apr 21 | Oct 26 | 188 d | 6a |
| Middlebranch | Apr 24 | Oct 26 | 185 d | 6b |
| Middleburg | Apr 26 | Oct 20 | 177 d | 6a |
| Middlefield | May 1 | Oct 20 | 172 d | 6a |
| Middleport | Apr 27 | Oct 14 | 170 d | 6b |
| Middletown | Apr 24 | Oct 19 | 178 d | 6b |
| Midland | Apr 19 | Oct 22 | 186 d | 6b |
| Midvale | Apr 29 | Oct 15 | 169 d | 6b |
| Milan | Apr 25 | Oct 25 | 183 d | 6b |
| Milford | Apr 23 | Oct 18 | 178 d | 6b |
| Milford Center | Apr 19 | Oct 26 | 190 d | 6a |
| Millbury | Apr 20 | Oct 27 | 190 d | 6b |
| Milledgeville | Apr 23 | Oct 21 | 181 d | 6b |
| Miller City | Apr 23 | Oct 22 | 182 d | 6a |
| Millersburg | May 2 | Oct 14 | 165 d | 6a |
| Millersport | Apr 22 | Oct 18 | 179 d | 6a |
| Millfield | Apr 25 | Oct 23 | 181 d | 6b |
| Milton Center | Apr 24 | Oct 21 | 180 d | 6a |
| Mineral City | Apr 30 | Oct 15 | 168 d | 6b |
| Mineral Ridge | May 8 | Oct 12 | 157 d | 6a |
| Minerva | May 2 | Oct 13 | 164 d | 6a |
| Minford | Apr 21 | Oct 24 | 186 d | 6b |
| Mingo | Apr 24 | Oct 19 | 178 d | 6a |
| Mingo Junction | Apr 29 | Oct 20 | 174 d | 6b |
| Minster | Apr 27 | Oct 20 | 176 d | 6a |
| Mogadore | Apr 24 | Oct 28 | 187 d | 6b |
| Monclova | Apr 22 | Oct 24 | 185 d | 6b |
| Monroe | Apr 24 | Oct 19 | 178 d | 6b |
| Monroeville | Apr 25 | Oct 25 | 183 d | 6a |
| Montezuma | Apr 27 | Oct 19 | 175 d | 6a |
| Montpelier | Apr 28 | Oct 18 | 173 d | 6a |
| Montville | May 5 | Oct 18 | 166 d | 6a |
| Morral | Apr 25 | Oct 20 | 178 d | 6a |
| Morristown | Apr 27 | Oct 22 | 178 d | 6b |
| Morrow | Apr 23 | Oct 18 | 178 d | 6b |
| Moscow | Apr 16 | Oct 31 | 198 d | 6b |
| Mount Blanchard | Apr 19 | Oct 23 | 187 d | 6a |
| Mount Cory | Apr 23 | Oct 22 | 182 d | 6a |
| Mount Eaton | Apr 24 | Oct 21 | 180 d | 6a |
| Mount Gilead | Apr 26 | Oct 20 | 177 d | 6a |
| Mount Hope | May 2 | Oct 14 | 165 d | 6a |
| Mount Liberty | Apr 27 | Oct 17 | 173 d | 6a |
| Mount Orab | Apr 11 | Oct 30 | 202 d | 6b |
| Mount Perry | Apr 30 | Oct 17 | 170 d | 6a |
| Mount Pleasant | Apr 18 | Nov 1 | 197 d | 6b |
| Mount Saint Joseph | Apr 13 | Oct 31 | 201 d | 6b |
| Mount Sterling | Apr 23 | Oct 21 | 181 d | 6b |
| Mount Vernon | May 1 | Oct 10 | 162 d | 6a |
| Mount Victory | Apr 22 | Oct 24 | 185 d | 6a |
| Mowrystown | Apr 24 | Oct 20 | 179 d | 6b |
| Moxahala | Apr 30 | Oct 17 | 170 d | 6a |
| Munroe Falls | Apr 30 | Oct 21 | 174 d | 6b |
| Murray City | Apr 30 | Oct 14 | 167 d | 6b |