Frost dates in New Hampshire
Across 54 NOAA stations in New Hampshire, the average last spring frost ranges from April 21 at Manchester Airport to May 31 at Colebrook 3Sw.
| Benton 5 Sw | May 15 | September 28 | 133 |
| Berlin | May 14 | September 30 | 135 |
| Berlin Muni Airport | May 30 | September 19 | 112 |
| Bethlehem 2 | May 24 | September 18 | 116 |
| Bradford 2 | May 15 | September 27 | 135 |
| Colebrook 3Sw | May 31 | September 21 | 112 |
| Concord Muni Airport | May 8 | October 3 | 146 |
| Durham | May 8 | October 4 | 148 |
| Durham 2 N | May 3 | October 10 | 158 |
| Durham 2 Ssw | May 7 | October 4 | 150 |
| E Milford | April 28 | October 8 | 161 |
| E Sandwich | May 6 | October 6 | 151 |
| Epping | May 7 | October 4 | 148 |
| Errol Airport | May 21 | September 22 | 123 |
| First Connecticut Lake | May 25 | September 24 | 121 |
| Franklin Falls Dam | May 7 | October 3 | 148 |
| Gorham Airport | May 14 | September 26 | 133 |
| Grafton | May 21 | September 26 | 127 |
| Greenland | May 4 | October 8 | 157 |
| Greenville 1 Nne | May 10 | October 6 | 147 |
| Hanover | May 1 | October 13 | 162 |
| Hopkinton Lake | May 6 | October 1 | 146 |
| Hudson 1 Sse | May 3 | October 8 | 156 |
| Jaffrey Muni Airport | May 5 | October 6 | 152 |
| Jaffrey Silver Rch Airpark | May 5 | October 6 | 154 |
| Jefferson | May 8 | October 1 | 146 |
| Keene | May 14 | October 1 | 138 |
| Lakeport 2 | April 30 | October 18 | 170 |
| Lancaster | May 18 | September 30 | 132 |
| Lebanon Muni Airport | May 9 | October 6 | 148 |
| Lincoln Nepp | May 7 | October 4 | 149 |
| Manchester Airport | April 21 | October 19 | 180 |
| Massabesic Lake | April 30 | October 11 | 164 |
| Meredith 3 Nne | April 28 | October 16 | 171 |
| Milford | May 3 | October 5 | 156 |
| Mt Sunapee | May 2 | October 9 | 158 |
| N Conway | May 7 | October 5 | 150 |
| N Stratford | May 19 | September 29 | 131 |
| Nashua 2 Nnw | April 30 | October 12 | 165 |
| Nashua Cwsu | April 29 | October 8 | 162 |
| Newport | May 14 | October 1 | 140 |
| Pinkham Notch | May 18 | October 1 | 135 |
| Plymouth | May 20 | September 27 | 128 |
| Rochester Skyhaven Airport | April 30 | October 9 | 161 |
| Salisbury | May 14 | September 29 | 138 |
| Tamworth 4 | May 16 | September 26 | 129 |
| W Hampstead | April 30 | October 11 | 162 |
| Walpole 2S Nepp | May 8 | October 3 | 149 |
| Waterville Valley Nepp | May 15 | September 28 | 134 |
| Weare | May 2 | October 8 | 158 |
| Weare 2 Ne | May 9 | October 5 | 148 |
| Wentworth | May 12 | October 6 | 146 |
| Whitefield Mt Washington Airport | May 27 | September 19 | 116 |
| York Pond | May 23 | September 22 | 122 |
Sources
- U.S. Annual/Seasonal Climate Normals, 1991 to 2020 (freeze probability dates by station), NOAA National Centers for Environmental Information, checked 1 November 2026
- Annual/Seasonal Normals 1991 to 2020 documentation, NOAA National Centers for Environmental Information, checked 1 November 2026
- 2024 Gazetteer Files, ZIP Code Tabulation Areas, US Census Bureau, checked 1 November 2026