New Hampshire frost dates: N
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Nashua | Apr 29 | Oct 8 | 162 d | 6a |
| Nelson | May 14 | Oct 1 | 140 d | 6a |
| New Boston | May 2 | Oct 8 | 159 d | 6a |
| New Castle | May 4 | Oct 8 | 157 d | 6a |
| New Durham | Apr 30 | Oct 9 | 162 d | 5b |
| New Hampton | Apr 28 | Oct 16 | 171 d | 5b |
| New Ipswich | May 10 | Oct 6 | 149 d | 6a |
| New London | May 2 | Oct 9 | 160 d | 5b |
| Newbury | May 2 | Oct 9 | 160 d | 5b |
| Newfields | May 7 | Oct 4 | 150 d | 6a |
| Newmarket | May 7 | Oct 4 | 150 d | 6a |
| Newport | May 14 | Oct 1 | 140 d | 5a |
| Newton | May 1 | Oct 12 | 164 d | 6a |
| Newton Junction | May 1 | Oct 12 | 164 d | 6a |
| North Conway | May 7 | Oct 5 | 151 d | 5a |
| North Hampton | May 4 | Oct 8 | 157 d | 6a |
| North Haverhill | May 15 | Sep 28 | 136 d | 5a |
| North Salem | Apr 30 | Oct 11 | 164 d | 6a |
| North Sandwich | May 6 | Oct 6 | 153 d | 5a |
| North Stratford | May 19 | Sep 29 | 133 d | 4a |
| North Sutton | May 2 | Oct 9 | 160 d | 5b |
| North Walpole | May 8 | Oct 3 | 148 d | 5b |
| North Woodstock | May 7 | Oct 4 | 150 d | 5a |
| Northwood | May 8 | Oct 4 | 149 d | 6a |
| Nottingham | May 7 | Oct 4 | 150 d | 6a |