California frost dates: M
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Macdoel | Jun 5 | Sep 20 | 107 d | 6b |
| Mad River | Mar 4 | Nov 22 | 263 d | 8b |
| Madeline | Jun 14 | Sep 18 | 96 d | 6b |
| Madera | Feb 18 | Nov 27 | 282 d | 9b |
| Madison | Feb 7 | Dec 5 | 301 d | 9b |
| Magalia | Apr 17 | Nov 11 | 208 d | 8b |
| Malibu | rare frost | 11a | ||
| Mammoth Lakes | Jun 10 | Sep 17 | 99 d | 6a |
| Manchester | Mar 5 | Nov 21 | 261 d | 9b |
| Manhattan Beach | rare frost | 10b | ||
| Manteca | Feb 6 | Dec 1 | 298 d | 9b |
| Manton | Jun 10 | Sep 13 | 95 d | 9a |
| March Air Reserve Base | Jan 9 | Dec 25 | 350 d | 9b |
| Maricopa | Jan 24 | Dec 17 | 327 d | 8b |
| Marina | Feb 4 | Dec 6 | 305 d | 10a |
| Marina Del Rey | rare frost | 10b | ||
| Marina Del Rey (Los Angeles) | Jan 9 | Jan 5 | 361 d | 10b |
| Mariposa | May 24 | Oct 10 | 139 d | 9a |
| Markleeville | frost any month | 6b | ||
| Marshall | Jan 1 | Dec 31 | 364 d | 9b |
| Martell | Mar 4 | Dec 11 | 282 d | 9b |
| Martinez | Feb 28 | Nov 22 | 267 d | 9b |
| Marysville | Jan 15 | Dec 12 | 331 d | 9b |
| Mather | Jan 12 | Dec 16 | 338 d | 9b |
| Maxwell | Feb 14 | Dec 1 | 290 d | 9b |
| Maywood | rare frost | 10b | ||
| Mc Farland | Jan 31 | Dec 8 | 311 d | 9b |
| Mc Kittrick | Feb 9 | Nov 26 | 290 d | 9b |
| Mcarthur | May 29 | Sep 19 | 113 d | 7a |
| Mcclellan | Jan 12 | Dec 16 | 338 d | 9b |
| Mccloud | May 28 | Sep 30 | 125 d | 7b |
| Mckinleyville | Mar 8 | Nov 30 | 267 d | 9b |
| Meadow Valley | May 22 | Sep 25 | 126 d | 8a |
| Meadow Vista | Feb 25 | Dec 5 | 283 d | 9a |
| Mecca | Jan 6 | Dec 22 | 350 d | 10a |
| Mendocino | Mar 2 | Dec 1 | 274 d | 10a |
| Mendota | Feb 12 | Nov 30 | 291 d | 9a |
| Menifee | Jan 28 | Dec 18 | 324 d | 9b |
| Menlo Park | Feb 25 | Nov 25 | 273 d | 9b |
| Mentone | Jan 27 | Dec 19 | 326 d | 10a |
| Merced | Feb 26 | Nov 25 | 272 d | 9a |
| Meridian | Feb 11 | Nov 30 | 292 d | 9b |
| Mi Wuk Village | Apr 9 | Nov 9 | 214 d | 8b |
| Middletown | Apr 10 | Nov 6 | 210 d | 9a |
| Midpines | May 12 | Nov 1 | 173 d | 9a |
| Midway City | rare frost | 10a | ||
| Milford | May 16 | Oct 8 | 145 d | 7a |
| Mill Creek | Jun 10 | Sep 13 | 95 d | 7a |
| Mill Valley | Jan 16 | Dec 18 | 336 d | 10a |
| Millbrae | Dec 29 | Dec 26 | 362 d | 10a |
| Millville | Mar 3 | Nov 21 | 263 d | 9a |
| Milpitas | Jan 12 | Dec 22 | 344 d | 10a |
| Mineral | Jun 10 | Sep 13 | 95 d | 7b |
| Mira Loma | Jan 9 | Dec 30 | 355 d | 10a |
| Miramonte | Jun 1 | Oct 7 | 128 d | 9a |
| Miranda | Mar 10 | Dec 1 | 266 d | 9b |
| Mission Hills | Jan 2 | Jan 1 | 364 d | 10a |
| Mission Viejo | rare frost | 10b | ||
| Moccasin | Apr 22 | Nov 2 | 194 d | 9b |
| Modesto | Jan 31 | Dec 5 | 308 d | 9b |
| Mojave | Mar 15 | Nov 17 | 247 d | 8b |
| Mokelumne Hill | May 7 | Oct 28 | 174 d | 9a |
| Mono Hot Springs | Jun 1 | Oct 6 | 127 d | 6a |
| Monrovia | Apr 28 | Nov 15 | 201 d | 10a |
| Montague | May 12 | Oct 8 | 149 d | 7b |
| Montara | Jan 11 | Jan 10 | 364 d | 10a |
| Montclair | Jan 8 | Dec 28 | 354 d | 10a |
| Monte Rio | Jan 29 | Dec 30 | 335 d | 9b |
| Montebello | Jan 4 | Jan 2 | 363 d | 10b |
| Monterey | Jan 3 | Dec 28 | 359 d | 10a |
| Monterey Park | Jan 4 | Jan 2 | 363 d | 10b |
| Montgomery Creek | Jun 3 | Sep 14 | 103 d | 9a |
| Montrose | Jan 8 | Jan 7 | 364 d | 10a |
| Moorpark | Dec 31 | Dec 28 | 362 d | 10a |
| Moraga | Mar 8 | Dec 22 | 289 d | 9b |
| Moreno Valley | rare frost | 9b | ||
| Morgan Hill | Feb 24 | Nov 27 | 276 d | 9b |
| Morongo Valley | Feb 25 | Dec 15 | 293 d | 9b |
| Morro Bay | Jan 19 | Jan 14 | 360 d | 10a |
| Moss Beach | Jan 11 | Jan 10 | 364 d | 10a |
| Moss Landing | Jan 28 | Dec 13 | 319 d | 10a |
| Mount Aukum | Mar 31 | Nov 21 | 235 d | 9a |
| Mount Baldy | May 16 | Oct 13 | 150 d | 8a |
| Mount Hamilton | May 3 | Nov 18 | 199 d | 9b |
| Mount Hermon | Mar 25 | Nov 11 | 231 d | 9a |
| Mount Laguna | Apr 22 | Nov 8 | 200 d | 8a |
| Mount Shasta | May 15 | Oct 6 | 144 d | 8a |
| Mount Wilson | Apr 28 | Nov 15 | 201 d | 9a |
| Mountain Center | May 16 | Oct 24 | 161 d | 8b |
| Mountain Pass | Mar 17 | Nov 20 | 248 d | 8b |
| Mountain Ranch | May 7 | Oct 28 | 174 d | 9a |
| Mountain View | Jan 6 | Dec 23 | 351 d | 10a |
| Murphys | Feb 20 | Dec 11 | 294 d | 9a |
| Murrieta | Feb 2 | Jan 30 | 362 d | 9b |
| Myers Flat | Mar 4 | Nov 22 | 263 d | 9b |