Connecticut frost dates: N
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Naugatuck | Apr 18 | Oct 26 | 191 d | 6b |
| New Britain | Apr 17 | Oct 26 | 192 d | 6b |
| New Canaan | Apr 17 | Oct 23 | 189 d | 7a |
| New Fairfield | Apr 20 | Oct 20 | 183 d | 6b |
| New Hartford | May 8 | Oct 5 | 150 d | 6a |
| New Haven | Apr 17 | Oct 27 | 193 d | 7a |
| New London | Apr 16 | Oct 28 | 195 d | 7a |
| New Milford | Apr 20 | Oct 20 | 183 d | 6b |
| New Preston Marble Dale | May 11 | Oct 4 | 146 d | 6a |
| Newington | Apr 17 | Oct 26 | 192 d | 6b |
| Newtown | Apr 20 | Oct 20 | 183 d | 6b |
| Niantic | Apr 16 | Oct 28 | 195 d | 7a |
| Norfolk | May 3 | Oct 11 | 161 d | 6a |
| North Branford | Apr 17 | Oct 27 | 193 d | 7a |
| North Canton | Apr 30 | Oct 17 | 170 d | 6a |
| North Franklin | Apr 14 | Oct 24 | 193 d | 6b |
| North Granby | Apr 28 | Oct 17 | 172 d | 6a |
| North Grosvenordale | May 1 | Oct 9 | 161 d | 6a |
| North Haven | Apr 18 | Oct 26 | 191 d | 6b |
| North Stonington | Apr 11 | Oct 31 | 203 d | 6b |
| North Westchester | Apr 28 | Oct 13 | 168 d | 6b |
| North Windham | Apr 28 | Oct 13 | 168 d | 6b |
| Northfield | May 8 | Oct 5 | 150 d | 6a |
| Northford | Apr 18 | Oct 26 | 191 d | 6b |
| Norwalk | Apr 17 | Oct 23 | 189 d | 7a |
| Norwich | Apr 14 | Oct 24 | 193 d | 6b |