New Jersey frost dates: R
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Rahway | Apr 11 | Oct 31 | 203 d | 7b |
| Ramsey | Apr 19 | Oct 23 | 187 d | 7a |
| Rancocas | Apr 15 | Oct 29 | 197 d | 7b |
| Randolph | Apr 17 | Oct 23 | 189 d | 6b |
| Raritan | Apr 30 | Oct 20 | 173 d | 7a |
| Readington | Apr 26 | Oct 18 | 175 d | 7a |
| Red Bank | Apr 9 | Nov 3 | 208 d | 7b |
| Richland | Apr 24 | Oct 22 | 181 d | 7a |
| Richwood | Apr 8 | Nov 1 | 207 d | 7b |
| Ridgefield | Apr 3 | Nov 4 | 215 d | 7b |
| Ridgefield Park | Apr 3 | Nov 4 | 215 d | 7b |
| Ridgewood | Apr 15 | Oct 28 | 196 d | 7a |
| Ringoes | Apr 16 | Oct 27 | 194 d | 7a |
| Ringwood | Apr 19 | Oct 23 | 187 d | 7a |
| Rio Grande | Apr 1 | Nov 9 | 222 d | 8a |
| River Edge | Apr 3 | Nov 4 | 215 d | 7b |
| Riverdale | Apr 19 | Oct 23 | 187 d | 7a |
| Riverside | Apr 4 | Nov 7 | 217 d | 7b |
| Riverton | Apr 15 | Oct 31 | 199 d | 7b |
| Rochelle Park | Apr 3 | Nov 4 | 215 d | 7b |
| Rockaway | Apr 17 | Oct 23 | 189 d | 6b |
| Rocky Hill | Apr 16 | Oct 27 | 194 d | 7a |
| Roebling | Apr 15 | Oct 29 | 197 d | 7a |
| Roosevelt | Apr 25 | Oct 16 | 174 d | 7a |
| Roseland | Apr 18 | Oct 24 | 189 d | 7a |
| Roselle | Apr 11 | Oct 31 | 203 d | 7b |
| Roselle Park | Apr 11 | Oct 31 | 203 d | 7b |
| Rosemont | Apr 16 | Oct 19 | 186 d | 7a |
| Rosenhayn | Apr 10 | Nov 1 | 205 d | 7b |
| Rumson | Apr 9 | Nov 3 | 208 d | 7b |
| Runnemede | Apr 8 | Nov 1 | 207 d | 7b |
| Rutherford | Apr 3 | Nov 4 | 215 d | 7b |