Kansas frost dates: R
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Ramona | Apr 24 | Oct 14 | 173 d | 6a |
| Randall | Apr 19 | Oct 19 | 183 d | 6a |
| Randolph | Apr 22 | Oct 20 | 181 d | 6a |
| Ransom | Apr 29 | Oct 13 | 167 d | 6a |
| Rantoul | Apr 18 | Oct 20 | 185 d | 6b |
| Raymond | Apr 15 | Oct 23 | 191 d | 6b |
| Reading | Apr 13 | Oct 26 | 196 d | 6b |
| Redfield | Apr 5 | Oct 28 | 206 d | 7a |
| Republic | Apr 20 | Oct 19 | 182 d | 6a |
| Rexford | Apr 20 | Oct 20 | 183 d | 6a |
| Richfield | Apr 27 | Oct 19 | 175 d | 6b |
| Richmond | Apr 17 | Oct 22 | 188 d | 6b |
| Riley | Apr 22 | Oct 20 | 181 d | 6b |
| Riverton | Apr 5 | Oct 31 | 209 d | 7a |
| Robinson | Apr 14 | Oct 22 | 191 d | 6a |
| Rock | Apr 18 | Oct 21 | 186 d | 7a |
| Rolla | Apr 27 | Oct 19 | 175 d | 6b |
| Rosalia | Apr 13 | Oct 25 | 195 d | 6b |
| Rose Hill | Apr 14 | Oct 22 | 191 d | 7a |
| Rossville | Apr 16 | Oct 22 | 189 d | 6b |
| Roxbury | Apr 18 | Oct 24 | 189 d | 6b |
| Rozel | Apr 16 | Oct 27 | 194 d | 6b |
| Rush Center | Apr 30 | Oct 10 | 163 d | 6b |
| Russell | Apr 22 | Oct 17 | 178 d | 6b |