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Massachusetts frost dates

Across 69 NOAA climate stations in Massachusetts, the median last spring frost (32°F) ranges from Apr 4 at Boston Logan Intl AP to May 17 at E Hawley; the typical station sees its last frost around Apr 27 and its first fall frost around Oct 14.

“Median” dates have a 50% chance of a later spring frost or an earlier fall frost. “10% risk” dates are the safer choice for tender plants: only 1 year in 10 has frost beyond them. Source: NOAA NCEI 1991–2020 Climate Normals. Elevation matters: within a state, frost dates can differ by a month or more between valleys and hills.

StationElevationLast frost (median)Last frost (10% risk)First frost (median)First frost (10% risk)Growing season
Amherst145 ftMay 5May 19Oct 8Sep 28156 days
Ashburnham1,108 ftMay 2May 16Oct 13Oct 1163 days
Ashburnham N1,146 ftMay 5May 19Oct 7Sep 24152 days
Barre Falls Dam825 ftMay 12May 28Oct 1Sep 18141 days
Bedford160 ftApr 27May 11Oct 13Oct 1169 days
Bedford Hanscom Fld133 ftApr 28May 12Oct 10Sep 28165 days
Belchertown550 ftMay 3May 16Oct 14Oct 1164 days
Beverly65 ftMay 4May 17Oct 12Oct 1160 days
Beverly Muni AP108 ftApr 24May 6Oct 17Oct 3177 days
Birch Hill Dam855 ftMay 6May 19Oct 1Sep 19148 days
Blue Hill625 ftApr 19May 1Oct 24Oct 10187 days
Blue Hill Coop625 ftApr 18Apr 30Oct 26Oct 9190 days
Boston Logan Intl AP12 ftApr 4Apr 17Nov 9Oct 29218 days
Bridgewater40 ftMay 1May 15Oct 9Sep 26161 days
Brockton75 ftApr 22May 5Oct 19Oct 5178 days
Buffumville Lake520 ftMay 1May 13Oct 10Sep 28162 days
Chatham40 ftApr 5Apr 18Nov 15Nov 1221 days
Chatham Muni AP68 ftApr 13Apr 26Nov 4Oct 21206 days
E Brimfield Lake700 ftApr 28May 17Oct 15Oct 1169 days
E Hawley1,647 ftMay 17May 30Oct 1Sep 18136 days
E Sandwich150 ftApr 26May 9Oct 26Oct 11180 days
E Wareham30 ftApr 21May 3Oct 24Oct 11186 days
Edgartown30 ftApr 17May 3Nov 3Oct 20199 days
Fitchburg Coop665 ftMay 1May 14Oct 9Sep 29162 days
Fitchburg Muni AP348 ftApr 29May 13Oct 11Oct 1164 days
Greenfield #3130 ftMay 1May 15Oct 11Sep 29162 days
Groveland30 ftMay 3May 17Oct 8Sep 28158 days
Haverhill20 ftMay 1May 14Oct 12Oct 1163 days
Hingham35 ftApr 25May 8Oct 22Oct 6177 days
Hyannis60 ftApr 16Apr 30Oct 30Oct 15195 days
Hyannis Barnstable Muni AP55 ftApr 22May 5Oct 28Oct 13188 days
Jamaica Plain95 ftApr 19May 3Oct 23Oct 8185 days
Lawrence50 ftApr 13Apr 29Oct 28Oct 13198 days
Lawrence Muni AP149 ftApr 21May 1Oct 21Oct 6182 days
Lenox Dale1,004 ftMay 7May 21Oct 3Sep 21147 days
Leverett #2315 ftMay 2May 16Oct 9Sep 29160 days
Lowell110 ftApr 30May 10Oct 10Sep 30164 days
Marblehead84 ftApr 25May 13Oct 20Oct 5176 days
Maynard 2205 ftMay 2May 16Oct 6Sep 25156 days
Middleboro45 ftApr 23May 6Oct 16Oct 3174 days
Middleton110 ftMay 3May 20Oct 9Sep 29157 days
Nantucket Mem AP45 ftApr 13Apr 27Nov 8Oct 25208 days
Natick180 ftApr 26May 9Oct 12Oct 1169 days
New Bedford Coop18 ftApr 11Apr 22Nov 5Oct 24208 days
New Bedford Muni AP80 ftApr 29May 15Oct 15Oct 2167 days
North Adams Harriman AP654 ftMay 10May 25Oct 4Sep 21147 days
Norton W95 ftApr 27May 10Oct 15Oct 1168 days
Norwood Mem AP50 ftApr 25May 11Oct 9Sep 28167 days
NWS Boston/Norton85 ftApr 23May 5Oct 17Oct 3177 days
Orange Muni AP555 ftMay 4May 17Oct 8Sep 27157 days
Pittsfield Muni AP1,194 ftMay 5May 21Oct 5Sep 23152 days
Plymouth Muni AP149 ftApr 30May 12Oct 16Oct 3170 days
Plymouth-Kingston45 ftApr 15Apr 28Nov 1Oct 17198 days
Reading110 ftApr 25May 8Oct 17Oct 3174 days
Rochester65 ftApr 23May 7Oct 21Oct 6180 days
Rowe 3NE1,735 ftMay 14May 26Oct 4Sep 20143 days
Southbridge 3 Sw685 ftApr 25May 8Oct 13Oct 2168 days
Taunton20 ftApr 22May 6Oct 19Oct 4179 days
Taunton Muni AP43 ftMay 2May 16Oct 8Sep 25158 days
Tully Lake680 ftApr 25May 8Oct 17Oct 3175 days
Vineyard Haven AP68 ftMay 7May 27Oct 9Sep 23156 days
W Harwich15 ftApr 13Apr 26Nov 3Oct 22204 days
Walpole 2170 ftApr 27May 11Oct 14Oct 2169 days
West Medway210 ftApr 30May 14Oct 9Sep 29162 days
Westfield 3 Sw430 ftApr 28May 11Oct 17Oct 2171 days
Westfield Barnes Muni AP271 ftMay 3May 17Oct 8Sep 26158 days
Woods Hole Golf Club80 ftApr 11Apr 24Nov 11Oct 31213 days
Worcester Rgnl AP1,000 ftApr 23May 5Oct 21Oct 6181 days
Worthington1,285 ftMay 13May 26Oct 2Sep 20144 days
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