New Hampshire Frost Dates
The median last spring freeze and first fall freeze (32°F) at 54 NOAA stations in New Hampshire, 1991-2020, with the growing season between them.
Every station
A median date has an even chance of a later freeze in spring or an earlier one in fall. Each town page gives the dates at 36, 32 and 28°F and every probability from 10 to 90 percent.
| Station | Elevation | Last freeze | First freeze | Season, days | Town page |
|---|---|---|---|---|---|
| Benton 5 Sw | 1,200 ft | May 15 | September 28 | 136 | North Haverhill |
| Berlin | 920 ft | May 14 | September 30 | 139 | Berlin |
| Berlin Muni AP | 1,158 ft | May 30 | September 19 | 112 | Milan |
| Bethlehem 2 | 1,180 ft | May 24 | September 18 | 117 | Bethlehem |
| Bradford 2 | 815 ft | May 15 | September 27 | 135 | Newbury |
| Colebrook 3SW | 1,120 ft | May 31 | September 21 | 113 | Columbia |
| Concord Muni AP | 346 ft | May 8 | October 3 | 148 | Concord |
| Durham | 75 ft | May 8 | October 4 | 149 | Durham |
| Durham 2 N | 119 ft | May 3 | October 10 | 160 | Madbury |
| Durham 2 Ssw | 63 ft | May 7 | October 4 | 150 | Newmarket |
| E Milford | 240 ft | April 28 | October 8 | 163 | Milford |
| E Sandwich | 692 ft | May 6 | October 6 | 153 | Sandwich |
| Epping | 160 ft | May 7 | October 4 | 150 | Epping |
| Errol AP | 1,240 ft | May 21 | September 22 | 124 | Milan |
| First Connecticut Lake | 1,650 ft | May 25 | September 24 | 122 | Pittsburg |
| Franklin Falls Dam | 450 ft | May 7 | October 3 | 149 | Franklin |
| Gorham AP | 800 ft | May 14 | September 26 | 135 | Gorham |
| Grafton | 830 ft | May 21 | September 26 | 128 | Grafton |
| Greenland | 95 ft | May 4 | October 8 | 157 | Greenland |
| Greenville 1 Nne | 900 ft | May 10 | October 6 | 149 | Greenville |
| Hanover | 584 ft | May 1 | October 13 | 165 | Hanover |
| Hopkinton Lake | 430 ft | May 6 | October 1 | 148 | Contoocook |
| Hudson 1 Sse | 185 ft | May 3 | October 8 | 158 | Hudson |
| Jaffrey Muni AP | 1,040 ft | May 5 | October 6 | 154 | Jaffrey |
| Jaffrey Silver Rch Airpark | 1,030 ft | May 5 | October 6 | 154 | Jaffrey |
| Jefferson | 1,235 ft | May 8 | October 1 | 146 | Jefferson |
| Keene | 511 ft | May 14 | October 1 | 140 | Keene |
| Lakeport 2 | 500 ft | April 30 | October 18 | 171 | Laconia |
| Lancaster | 860 ft | May 18 | September 30 | 135 | Lancaster |
| Lebanon Muni AP | 598 ft | May 9 | October 6 | 150 | |
| Lincoln Nepp | 807 ft | May 7 | October 4 | 150 | Lincoln |
| Manchester AP | 225 ft | April 21 | October 19 | 181 | Bedford |
| Massabesic Lake | 253 ft | April 30 | October 11 | 164 | Auburn |
| Meredith 3 Nne | 861 ft | April 28 | October 16 | 171 | Center Harbor |
| Milford | 320 ft | May 3 | October 5 | 155 | Milford |
| Mt Sunapee | 1,275 ft | May 2 | October 9 | 160 | Newbury |
| N Conway | 522 ft | May 7 | October 5 | 151 | North Conway |
| N Stratford | 950 ft | May 19 | September 29 | 133 | Stratford |
| Nashua 2 Nnw | 135 ft | April 30 | October 12 | 165 | Nashua |
| Nashua Cwsu | 180 ft | April 29 | October 8 | 162 | Nashua |
| Newport | 770 ft | May 14 | October 1 | 140 | Newport |
| Pinkham Notch | 2,025 ft | May 18 | October 1 | 136 | Jackson |
| Plymouth | 660 ft | May 20 | September 27 | 130 | Plymouth |
| Rochester Skyhaven AP | 323 ft | April 30 | October 9 | 162 | |
| Salisbury | 550 ft | May 14 | September 29 | 138 | Webster |
| Tamworth 4 | 541 ft | May 16 | September 26 | 133 | Tamworth |
| W Hampstead | 288 ft | April 30 | October 11 | 164 | Sandown |
| Walpole 2S Nepp | 604 ft | May 8 | October 3 | 148 | Walpole |
| Waterville Valley Nepp | 1,429 ft | May 15 | September 28 | 136 | Waterville Valley |
| Weare | 720 ft | May 2 | October 8 | 159 | Weare |
| Weare 2 Ne | 805 ft | May 9 | October 5 | 149 | Weare |
| Wentworth | 653 ft | May 12 | October 6 | 147 | Wentworth |
| Whitefield Mt Washington AP | 1,074 ft | May 27 | September 19 | 115 | Whitefield |
| York Pond | 1,519 ft | May 23 | September 22 | 122 | Berlin |
Sources
NOAA NCEI U.S. Climate Normals, 1991-2020, annual and seasonal freeze probabilities. Public domain.