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Maine frost dates

Across 82 NOAA climate stations in Maine, the median last spring frost (32°F) ranges from Apr 21 at Woodland to Jun 2 at Allagash; the typical station sees its last frost around May 8 and its first fall frost around Oct 2.

“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
Acadia Np470 ftApr 27May 8Oct 22Oct 6177 days
Allagash596 ftJun 2Jun 21Sep 15Aug 29102 days
Andover 2822 ftMay 19Jun 1Sep 25Sep 13129 days
Augusta State AP350 ftApr 27May 7Oct 16Oct 2172 days
Bangor Intl AP148 ftMay 4May 17Oct 4Sep 23152 days
Barnard545 ftMay 12May 26Oct 1Sep 18141 days
Bath25 ftMay 10May 23Oct 6Sep 25149 days
Belfast20 ftMay 7May 21Oct 5Sep 24151 days
Bethel 6 Sse790 ftMay 6May 19Oct 2Sep 20147 days
Brassua Dam1,069 ftMay 23Jun 4Sep 29Sep 16128 days
Bridgewater420 ftMay 25Jun 7Sep 18Sep 4115 days
Bridgton 3 Nw508 ftMay 5May 17Oct 5Sep 22151 days
Brunswick Nas70 ftMay 2May 14Oct 10Sep 29160 days
Cape Neddick152 ftMay 1May 14Oct 14Oct 1165 days
Caribou Muni AP624 ftMay 7May 24Oct 1Sep 17143 days
Clayton Lake1,000 ftMay 30Jun 12Sep 13Aug 29106 days
Corinna297 ftMay 8May 23Oct 3Sep 21148 days
Danforth475 ftMay 25Jun 8Sep 24Sep 8119 days
Dover-Foxcroft Wwtp370 ftMay 15May 28Sep 28Sep 15134 days
Durham140 ftMay 15May 28Oct 2Sep 20139 days
E Sangerville635 ftMay 6May 20Oct 7Sep 26153 days
E Surry105 ftMay 8May 23Oct 9Sep 27152 days
East Hiram528 ftMay 12May 25Oct 1Sep 19140 days
Eastport85 ftApr 29May 11Oct 25Oct 8178 days
Eustis1,260 ftMay 24Jun 6Sep 21Sep 6118 days
Farmington405 ftMay 16Jun 1Sep 26Sep 14130 days
Frenchville Aroostook AP988 ftMay 6May 21Oct 2Sep 18147 days
Fryeburg E Slopes AP445 ftMay 17Jun 1Sep 25Sep 11128 days
Ft Kent610 ftMay 23Jun 6Sep 24Sep 11121 days
Gardiner133 ftMay 1May 14Oct 11Sep 30163 days
Grand Lake Stream290 ftMay 4May 18Oct 10Oct 1157 days
Gray378 ftApr 28May 10Oct 19Oct 5172 days
Greenville Maine Forestry Svc1,037 ftMay 7May 20Oct 9Sep 27153 days
Harmony320 ftMay 11May 25Oct 1Sep 18141 days
Hartford705 ftMay 6May 21Oct 3Sep 23148 days
Hollis304 ftMay 14May 28Sep 30Sep 16136 days
Houlton 5N390 ftMay 19Jun 2Sep 23Sep 9125 days
Houlton Intl AP476 ftMay 27Jun 10Sep 18Sep 5115 days
Jackman1,214 ftMay 26Jun 7Sep 23Sep 8119 days
Jonesboro194 ftMay 3May 16Oct 9Sep 27158 days
Kennebunkport20 ftMay 9May 22Oct 3Sep 20146 days
Lewiston180 ftApr 25May 6Oct 19Oct 5177 days
Limestone 4 Nnw737 ftMay 16Jun 1Sep 24Sep 12129 days
Lincoln Sanitary District/Wtp190 ftMay 4May 16Oct 6Sep 24153 days
Livermore Falls 1 E380 ftMay 11May 24Sep 29Sep 16138 days
Long Falls Dam1,160 ftMay 13May 27Sep 30Sep 15138 days
Madison220 ftMay 8May 20Oct 5Sep 24149 days
Middle Dam1,460 ftMay 19May 31Oct 1Sep 19133 days
Millinocket360 ftMay 9May 24Oct 5Sep 23147 days
Millinocket Muni AP406 ftMay 8May 24Oct 1Sep 19143 days
Millinocket Wastewater360 ftMay 17May 31Sep 29Sep 17133 days
Moosehead1,037 ftMay 13May 29Sep 30Sep 16137 days
New Sharon480 ftMay 7May 22Oct 2Sep 20146 days
Newcastle213 ftApr 27May 10Oct 18Oct 3172 days
Old Town 2 W127 ftMay 13May 28Sep 28Sep 16137 days
Orono115 ftMay 1May 14Oct 6Sep 24157 days
Patten 2820 ftMay 13May 30Sep 30Sep 18138 days
Pittston Farm1,100 ftMay 20Jun 3Sep 23Sep 8123 days
Pittston Farms Nepp1,076 ftMay 21Jun 4Sep 21Sep 9122 days
Poland570 ftMay 3May 16Oct 7Sep 27157 days
Portland Intl Jetport45 ftApr 26May 7Oct 15Oct 2170 days
Presque Isle599 ftMay 14Jun 1Sep 26Sep 10131 days
Rangeley1,530 ftMay 23Jun 3Sep 27Sep 14127 days
Rangeley 2 Nw1,780 ftMay 23Jun 5Sep 24Sep 9123 days
Robbinston115 ftMay 5May 18Oct 13Oct 1160 days
Rumford 1 Sse630 ftMay 4May 17Oct 6Sep 26155 days
Rumford 6SW630 ftMay 12May 27Sep 29Sep 15139 days
Sanford 2 Nnw289 ftMay 16May 29Sep 30Sep 18136 days
Sebec Lake380 ftMay 16Jun 1Oct 1Sep 19135 days
Tenants Harbor21 ftApr 27May 8Oct 25Oct 10178 days
Topsfield 2620 ftMay 6May 18Oct 8Sep 28155 days
Turner565 ftMay 1May 13Oct 10Sep 29162 days
Van Buren 2456 ftMay 23Jun 5Sep 26Sep 11125 days
Vanceboro No 2420 ftMay 13May 28Oct 1Sep 20139 days
W Rockport 1 Nnw361 ftApr 27May 9Oct 19Oct 5175 days
Waterville Trtmt Plt73 ftMay 2May 14Oct 10Sep 30159 days
Wesley410 ftMay 2May 12Oct 15Oct 1164 days
West Buxton 2 Nnw220 ftMay 7May 18Oct 4Sep 23148 days
Westport Island90 ftApr 28May 9Oct 21Oct 5175 days
Windham 2NW443 ftApr 30May 12Oct 20Oct 5172 days
Wiscasset AP68 ftMay 8May 20Oct 7Sep 24151 days
Woodland123 ftApr 21May 2Oct 26Oct 7185 days
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