New Hampshire frost dates: L
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Laconia | Apr 30 | Oct 18 | 171 d | 5b |
| Lancaster | May 18 | Sep 30 | 135 d | 4b |
| Lebanon | May 9 | Oct 6 | 150 d | 5a |
| Lee | May 7 | Oct 4 | 150 d | 6a |
| Lempster | May 2 | Oct 9 | 160 d | 6a |
| Lincoln | May 7 | Oct 4 | 150 d | 5a |
| Lisbon | May 15 | Sep 28 | 136 d | 5a |
| Litchfield | Apr 30 | Oct 12 | 165 d | 6a |
| Littleton | May 24 | Sep 18 | 117 d | 4b |
| Lochmere | May 7 | Oct 3 | 149 d | 5b |
| Londonderry | Apr 21 | Oct 19 | 181 d | 6a |
| Loudon | May 8 | Oct 3 | 148 d | 5b |
| Lyme | May 9 | Oct 2 | 146 d | 5a |
| Lyme Center | May 9 | Oct 2 | 146 d | 5a |
| Lyndeborough | May 3 | Oct 5 | 155 d | 6a |