Minnesota frost dates: A
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Ada | May 11 | Sep 27 | 139 d | 4a |
| Adams | May 6 | Oct 1 | 148 d | 4b |
| Adrian | May 5 | Oct 3 | 151 d | 5a |
| Afton | Apr 23 | Oct 19 | 179 d | 5a |
| Ah Gwah Ching | May 4 | Oct 7 | 156 d | 4a |
| Aitkin | May 16 | Sep 28 | 135 d | 4a |
| Akeley | May 4 | Oct 7 | 156 d | 4a |
| Albany | May 3 | Oct 7 | 157 d | 4b |
| Albert Lea | Apr 27 | Oct 9 | 165 d | 5a |
| Alberta | May 4 | Oct 1 | 150 d | 4b |
| Albertville | May 4 | Oct 5 | 154 d | 4b |
| Alborn | May 27 | Sep 20 | 116 d | 4a |
| Alden | Apr 30 | Oct 6 | 159 d | 5a |
| Aldrich | May 10 | Sep 30 | 143 d | 4a |
| Alexandria | May 2 | Oct 8 | 159 d | 4b |
| Almelund | May 19 | Sep 25 | 129 d | 4b |
| Alpha | Apr 28 | Oct 8 | 163 d | 5a |
| Altura | Apr 23 | Oct 16 | 176 d | 4b |
| Alvarado | May 5 | Oct 2 | 150 d | 4a |
| Amboy | Apr 30 | Oct 7 | 160 d | 5a |
| Andover | May 5 | Oct 2 | 150 d | 4b |
| Angle Inlet | May 16 | Sep 24 | 131 d | 3b |
| Angora | May 12 | Oct 1 | 142 d | 3b |
| Annandale | May 2 | Oct 5 | 156 d | 4b |
| Anoka | May 5 | Oct 2 | 150 d | 4b |
| Appleton | May 3 | Oct 2 | 152 d | 4b |
| Arco | May 6 | Oct 3 | 150 d | 5a |
| Argyle | May 15 | Sep 26 | 134 d | 4a |
| Arlington | Apr 24 | Oct 15 | 174 d | 4b |
| Ashby | May 4 | Oct 5 | 154 d | 4b |
| Askov | May 18 | Sep 26 | 131 d | 4a |
| Atwater | Apr 30 | Oct 7 | 160 d | 4b |
| Audubon | May 15 | Sep 24 | 132 d | 4a |
| Aurora | frost any month | 3b | ||
| Austin | Apr 30 | Oct 5 | 158 d | 4b |
| Avoca | May 7 | Sep 29 | 145 d | 5a |
| Avon | May 3 | Oct 7 | 157 d | 4b |