Oregon frost dates: M
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Madras | May 19 | Oct 4 | 138 d | 7a |
| Malin | Jun 6 | Sep 14 | 100 d | 6b |
| Manning | Apr 16 | Oct 26 | 193 d | 8b |
| Manzanita | Apr 2 | Nov 12 | 224 d | 9a |
| Mapleton | Feb 15 | Dec 9 | 297 d | 9a |
| Marcola | Apr 3 | Nov 11 | 222 d | 8b |
| Marylhurst | Mar 18 | Nov 18 | 245 d | 9a |
| Maupin | May 5 | Oct 7 | 155 d | 7a |
| Mcminnville | Apr 5 | Nov 7 | 216 d | 8b |
| Meacham | frost any month | 6b | ||
| Medford | Apr 8 | Oct 29 | 204 d | 8b |
| Mehama | Apr 30 | Oct 22 | 175 d | 8b |
| Merlin | May 16 | Oct 30 | 167 d | 8b |
| Merrill | Jun 6 | Sep 14 | 100 d | 6b |
| Midland | Jun 5 | Sep 20 | 107 d | 6b |
| Mikkalo | May 10 | Oct 7 | 150 d | 7b |
| Mill City | Mar 9 | Dec 3 | 269 d | 8b |
| Milton Freewater | Mar 25 | Oct 29 | 218 d | 7a |
| Mitchell | May 22 | Oct 4 | 135 d | 7a |
| Molalla | Mar 16 | Nov 19 | 248 d | 8b |
| Monmouth | Apr 16 | Nov 1 | 199 d | 8b |
| Monroe | Apr 11 | Oct 30 | 202 d | 8b |
| Monument | May 9 | Sep 27 | 141 d | 7a |
| Moro | May 12 | Oct 4 | 145 d | 7a |
| Mosier | Apr 20 | Oct 13 | 176 d | 7b |
| Mount Angel | Mar 28 | Nov 10 | 227 d | 8b |
| Mount Hood Parkdale | May 13 | Oct 3 | 143 d | 7b |
| Mount Vernon | May 28 | Sep 18 | 113 d | 6b |
| Mulino | Mar 16 | Nov 19 | 248 d | 8b |
| Murphy | Apr 8 | Oct 28 | 203 d | 8b |
| Myrtle Creek | Mar 31 | Nov 6 | 220 d | 8b |
| Myrtle Point | Mar 28 | Nov 6 | 223 d | 9a |