State hub
New Hampshire frost dates by weather station
New Hampshire has 55 NOAA weather stations with 1991–2020 freeze statistics. Median last spring frost dates run from Apr 21 at Manchester Airport to May 31 at Colebrook 3sw.
- 55Stations
- Apr 21Earliest last frostManchester Airport
- May 31Latest last frostColebrook 3sw
- 180 daysLongest growing seasonManchester Airport
| Station | Last spring frost | First fall frost | Growing season | Elevation |
|---|---|---|---|---|
| Benton 5 SW | May 15 | Sep 28 | 133 days | 1,200 ft |
| Berlin | May 14 | Sep 30 | 135 days | 920 ft |
| Berlin Muni Airport | May 30 | Sep 19 | 112 days | 1,158 ft |
| Bethlehem 2 | May 24 | Sep 18 | 116 days | 1,180 ft |
| Bradford 2 | May 15 | Sep 27 | 135 days | 815 ft |
| Colebrook 3sw | May 31 | Sep 21 | 112 days | 1,120 ft |
| Concord Muni Airport | May 8 | Oct 3 | 146 days | 346 ft |
| Durham | May 8 | Oct 4 | 148 days | 75 ft |
| Durham 2 N | May 3 | Oct 10 | 158 days | 119 ft |
| Durham 2 SSW | May 7 | Oct 4 | 150 days | 63 ft |
| E Milford | Apr 28 | Oct 8 | 161 days | 240 ft |
| E Sandwich | May 6 | Oct 6 | 151 days | 692 ft |
| Epping | May 7 | Oct 4 | 148 days | 160 ft |
| Errol Airport | May 21 | Sep 22 | 123 days | 1,240 ft |
| First Connecticut Lake | May 25 | Sep 24 | 121 days | 1,650 ft |
| Franklin Falls Dam | May 7 | Oct 3 | 148 days | 450 ft |
| Gorham Airport | May 14 | Sep 26 | 133 days | 800 ft |
| Grafton | May 21 | Sep 26 | 127 days | 830 ft |
| Greenland | May 4 | Oct 8 | 157 days | 95 ft |
| Greenville 1 NNE | May 10 | Oct 6 | 147 days | 900 ft |
| Hanover | May 1 | Oct 13 | 162 days | 584 ft |
| Hopkinton Lake | May 6 | Oct 1 | 146 days | 430 ft |
| Hudson 1 SSE | May 3 | Oct 8 | 156 days | 185 ft |
| Jaffrey Muni Airport | May 5 | Oct 6 | 152 days | 1,040 ft |
| Jaffrey Silver Rch Airpark | May 5 | Oct 6 | 154 days | 1,030 ft |
| Jefferson | May 8 | Oct 1 | 146 days | 1,235 ft |
| Keene | May 14 | Oct 1 | 138 days | 511 ft |
| Lakeport 2 | Apr 30 | Oct 18 | 170 days | 500 ft |
| Lancaster | May 18 | Sep 30 | 132 days | 860 ft |
| Lebanon Muni Airport | May 9 | Oct 6 | 148 days | 598 ft |
| Lincoln Nepp | May 7 | Oct 4 | 149 days | 807 ft |
| Manchester Airport | Apr 21 | Oct 19 | 180 days | 225 ft |
| Massabesic Lake | Apr 30 | Oct 11 | 164 days | 253 ft |
| Meredith 3 NNE | Apr 28 | Oct 16 | 171 days | 861 ft |
| Milford | May 3 | Oct 5 | 156 days | 320 ft |
| Mount Sunapee | May 2 | Oct 9 | 158 days | 1,275 ft |
| Mount Washington | any month | any month | 66 days | 6,267 ft |
| N Conway | May 7 | Oct 5 | 150 days | 522 ft |
| N Stratford | May 19 | Sep 29 | 131 days | 950 ft |
| Nashua 2 NNW | Apr 30 | Oct 12 | 165 days | 135 ft |
| Nashua Cwsu | Apr 29 | Oct 8 | 162 days | 180 ft |
| Newport | May 14 | Oct 1 | 140 days | 770 ft |
| Pinkham Notch | May 18 | Oct 1 | 135 days | 2,025 ft |
| Plymouth | May 20 | Sep 27 | 128 days | 660 ft |
| Rochester Skyhaven Airport | Apr 30 | Oct 9 | 161 days | 323 ft |
| Salisbury | May 14 | Sep 29 | 138 days | 550 ft |
| Tamworth 4 | May 16 | Sep 26 | 129 days | 541 ft |
| W Hampstead | Apr 30 | Oct 11 | 162 days | 288 ft |
| Walpole 2s Nepp | May 8 | Oct 3 | 149 days | 604 ft |
| Waterville Valley Nepp | May 15 | Sep 28 | 134 days | 1,429 ft |
| Weare | May 2 | Oct 8 | 158 days | 720 ft |
| Weare 2 NE | May 9 | Oct 5 | 148 days | 805 ft |
| Wentworth | May 12 | Oct 6 | 146 days | 653 ft |
| Whitefield Mount Washington Airport | May 27 | Sep 19 | 116 days | 1,074 ft |
| York Pond | May 23 | Sep 22 | 122 days | 1,519 ft |
Sources
- NOAA National Centers for Environmental Information, U.S. Climate Normals 1991–2020, annual/seasonal normals by station (version 1.0.1), file dated June 27, 2023; documentation.
Freeze dates are 30-year probabilities, not forecasts. Check your local forecast before planting tender plants.