Connecticut frost dates: R
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Redding | May 1 | Oct 14 | 166 d | 6b |
| Redding Center | Apr 20 | Oct 20 | 183 d | 6b |
| Redding Ridge | Apr 20 | Oct 20 | 183 d | 6b |
| Ridgefield | May 1 | Oct 14 | 166 d | 6b |
| Riverside | Apr 17 | Oct 23 | 189 d | 7b |
| Riverton | Apr 30 | Oct 17 | 170 d | 6a |
| Rockfall | Apr 26 | Oct 16 | 173 d | 6b |
| Rocky Hill | Apr 17 | Oct 26 | 192 d | 6b |
| Rogers | May 1 | Oct 9 | 161 d | 6b |
| Roxbury | Apr 20 | Oct 20 | 183 d | 6b |