Massachusetts frost dates: R
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Randolph | Apr 18 | Oct 26 | 191 d | 6b |
| Raynham | Apr 22 | Oct 19 | 180 d | 6b |
| Raynham Center | Apr 29 | Oct 15 | 169 d | 6b |
| Reading | Apr 25 | Oct 17 | 175 d | 6b |
| Readville | Apr 18 | Oct 26 | 191 d | 6b |
| Rehoboth | Apr 23 | Oct 17 | 177 d | 7a |
| Revere | Apr 4 | Nov 9 | 219 d | 7a |
| Richmond | May 5 | Oct 5 | 153 d | 5b |
| Rochdale | Apr 23 | Oct 21 | 181 d | 6b |
| Rochester | Apr 23 | Oct 21 | 181 d | 7a |
| Rockland | Apr 25 | Oct 22 | 180 d | 6b |
| Rockport | May 4 | Oct 12 | 161 d | 7a |
| Roslindale | Apr 19 | Oct 23 | 187 d | 6b |
| Rowe | May 14 | Oct 4 | 143 d | 5b |
| Rowley | May 3 | Oct 8 | 158 d | 6b |
| Roxbury | Apr 19 | Oct 23 | 187 d | 7a |
| Roxbury Crossing | Apr 19 | Oct 23 | 187 d | 7a |
| Royalston | Apr 25 | Oct 17 | 175 d | 5b |
| Russell | Apr 28 | Oct 17 | 172 d | 6a |
| Rutland | May 12 | Oct 1 | 142 d | 6a |