New Hampshire climate

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.

StationElevationLast freezeFirst freezeSeason, daysTown page
Benton 5 Sw1,200 ftMay 15September 28136North Haverhill
Berlin920 ftMay 14September 30139Berlin
Berlin Muni AP1,158 ftMay 30September 19112Milan
Bethlehem 21,180 ftMay 24September 18117Bethlehem
Bradford 2815 ftMay 15September 27135Newbury
Colebrook 3SW1,120 ftMay 31September 21113Columbia
Concord Muni AP346 ftMay 8October 3148Concord
Durham75 ftMay 8October 4149Durham
Durham 2 N119 ftMay 3October 10160Madbury
Durham 2 Ssw63 ftMay 7October 4150Newmarket
E Milford240 ftApril 28October 8163Milford
E Sandwich692 ftMay 6October 6153Sandwich
Epping160 ftMay 7October 4150Epping
Errol AP1,240 ftMay 21September 22124Milan
First Connecticut Lake1,650 ftMay 25September 24122Pittsburg
Franklin Falls Dam450 ftMay 7October 3149Franklin
Gorham AP800 ftMay 14September 26135Gorham
Grafton830 ftMay 21September 26128Grafton
Greenland95 ftMay 4October 8157Greenland
Greenville 1 Nne900 ftMay 10October 6149Greenville
Hanover584 ftMay 1October 13165Hanover
Hopkinton Lake430 ftMay 6October 1148Contoocook
Hudson 1 Sse185 ftMay 3October 8158Hudson
Jaffrey Muni AP1,040 ftMay 5October 6154Jaffrey
Jaffrey Silver Rch Airpark1,030 ftMay 5October 6154Jaffrey
Jefferson1,235 ftMay 8October 1146Jefferson
Keene511 ftMay 14October 1140Keene
Lakeport 2500 ftApril 30October 18171Laconia
Lancaster860 ftMay 18September 30135Lancaster
Lebanon Muni AP598 ftMay 9October 6150
Lincoln Nepp807 ftMay 7October 4150Lincoln
Manchester AP225 ftApril 21October 19181Bedford
Massabesic Lake253 ftApril 30October 11164Auburn
Meredith 3 Nne861 ftApril 28October 16171Center Harbor
Milford320 ftMay 3October 5155Milford
Mt Sunapee1,275 ftMay 2October 9160Newbury
N Conway522 ftMay 7October 5151North Conway
N Stratford950 ftMay 19September 29133Stratford
Nashua 2 Nnw135 ftApril 30October 12165Nashua
Nashua Cwsu180 ftApril 29October 8162Nashua
Newport770 ftMay 14October 1140Newport
Pinkham Notch2,025 ftMay 18October 1136Jackson
Plymouth660 ftMay 20September 27130Plymouth
Rochester Skyhaven AP323 ftApril 30October 9162
Salisbury550 ftMay 14September 29138Webster
Tamworth 4541 ftMay 16September 26133Tamworth
W Hampstead288 ftApril 30October 11164Sandown
Walpole 2S Nepp604 ftMay 8October 3148Walpole
Waterville Valley Nepp1,429 ftMay 15September 28136Waterville Valley
Weare720 ftMay 2October 8159Weare
Weare 2 Ne805 ftMay 9October 5149Weare
Wentworth653 ftMay 12October 6147Wentworth
Whitefield Mt Washington AP1,074 ftMay 27September 19115Whitefield
York Pond1,519 ftMay 23September 22122Berlin

Sources

NOAA NCEI U.S. Climate Normals, 1991-2020, annual and seasonal freeze probabilities. Public domain.