Minnesota frost dates: R
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Racine | May 6 | Oct 1 | 148 d | 4b |
| Randall | May 4 | Oct 5 | 154 d | 4a |
| Randolph | Apr 27 | Oct 10 | 166 d | 4b |
| Ranier | May 29 | Sep 13 | 107 d | 3a |
| Raymond | Apr 30 | Oct 7 | 160 d | 4b |
| Reading | May 3 | Oct 4 | 154 d | 5a |
| Reads Landing | May 7 | Oct 2 | 148 d | 4b |
| Red Lake Falls | May 9 | Sep 30 | 144 d | 3b |
| Red Wing | Apr 23 | Oct 14 | 174 d | 4b |
| Redby | May 12 | Oct 4 | 145 d | 3b |
| Redlake | May 12 | Oct 4 | 145 d | 3b |
| Redwood Falls | Apr 30 | Oct 10 | 163 d | 5a |
| Remer | May 8 | Oct 1 | 146 d | 3b |
| Renville | May 6 | Oct 1 | 148 d | 4b |
| Revere | May 3 | Oct 2 | 152 d | 5a |
| Rice | May 10 | Sep 29 | 142 d | 4a |
| Richmond | May 3 | Oct 7 | 157 d | 4b |
| Richville | May 5 | Oct 5 | 153 d | 4a |
| Richwood | May 5 | Oct 3 | 151 d | 4a |
| Rochert | May 4 | Oct 3 | 152 d | 4a |
| Rochester | Apr 30 | Oct 6 | 159 d | 4b |
| Rock Creek | May 11 | Oct 1 | 143 d | 4b |
| Rockford | Apr 30 | Oct 8 | 161 d | 4b |
| Rockville | May 3 | Oct 7 | 157 d | 4b |
| Rogers | May 4 | Oct 5 | 154 d | 4b |
| Rollingstone | Apr 23 | Oct 16 | 176 d | 4b |
| Roosevelt | May 16 | Sep 24 | 131 d | 3b |
| Roscoe | May 3 | Oct 7 | 157 d | 4b |
| Rose Creek | Apr 30 | Oct 5 | 158 d | 4b |
| Roseau | May 16 | Sep 24 | 131 d | 3b |
| Rosemount | May 2 | Oct 5 | 156 d | 5a |
| Rothsay | May 5 | Oct 3 | 151 d | 4a |
| Round Lake | May 3 | Oct 4 | 154 d | 5a |
| Royalton | May 10 | Sep 29 | 142 d | 4a |
| Rush City | May 11 | Oct 1 | 143 d | 4b |
| Rushford | May 8 | Oct 3 | 148 d | 4b |
| Rushmore | May 3 | Oct 4 | 154 d | 5a |
| Russell | May 5 | Oct 3 | 151 d | 5a |
| Ruthton | May 7 | Sep 29 | 145 d | 4b |