Maine Frost Dates

Maine has 82 NOAA weather stations with freeze records in the 1991–2020 climate normals. The typical last spring frost ranges from April 21 at Woodland to June 2 at Allagash; at half the stations it has come by May 8. The first fall frost typically arrives between September 13 at Clayton Lake and October 26 at Woodland, with a median of October 2.

The growing season between the typical frosts runs from 102 days at Allagash to 185 days at Woodland; 146 days at the median station.

Every station in Maine

Typical dates have a 50% chance of a frost after them in spring, and before them in fall; safer dates, 10%. A garden can differ from its nearest station, especially in a valley or on a hillside: see why your garden may differ.

Maine: freeze (32 °F) dates by NOAA station, 1991–2020 normals
Station	Elevation	Last frost	Safer	First frost	Safer	Season (days)
Acadia Np	470 ft	Apr 27	May 8	Oct 22	Oct 6	177
Allagash	596 ft	Jun 2	Jun 21	Sep 15	Aug 29	102
Andover 2	822 ft	May 19	Jun 1	Sep 25	Sep 13	129
Augusta State Ap	350 ft	Apr 27	May 7	Oct 16	Oct 2	172
Bangor Intl Ap	148 ft	May 4	May 17	Oct 4	Sep 23	152
Barnard	545 ft	May 12	May 26	Oct 1	Sep 18	141
Bath	25 ft	May 10	May 23	Oct 6	Sep 25	149
Belfast	20 ft	May 7	May 21	Oct 5	Sep 24	151
Bethel 6 Sse	790 ft	May 6	May 19	Oct 2	Sep 20	147
Brassua Dam	1,069 ft	May 23	Jun 4	Sep 29	Sep 16	128
Bridgewater	420 ft	May 25	Jun 7	Sep 18	Sep 4	115
Bridgton 3 Nw	508 ft	May 5	May 17	Oct 5	Sep 22	151
Brunswick Nas	70 ft	May 2	May 14	Oct 10	Sep 29	160
Cape Neddick	152 ft	May 1	May 14	Oct 14	Oct 1	165
Caribou Muni Ap	624 ft	May 7	May 24	Oct 1	Sep 17	143
Clayton Lake	1,000 ft	May 30	Jun 12	Sep 13	Aug 29	106
Corinna	297 ft	May 8	May 23	Oct 3	Sep 21	148
Danforth	475 ft	May 25	Jun 8	Sep 24	Sep 8	119
Dover-Foxcroft Wwtp	370 ft	May 15	May 28	Sep 28	Sep 15	134
Durham	140 ft	May 15	May 28	Oct 2	Sep 20	139
E Sangerville	635 ft	May 6	May 20	Oct 7	Sep 26	153
E Surry	105 ft	May 8	May 23	Oct 9	Sep 27	152
East Hiram	528 ft	May 12	May 25	Oct 1	Sep 19	140
Eastport	85 ft	Apr 29	May 11	Oct 25	Oct 8	178
Eustis	1,260 ft	May 24	Jun 6	Sep 21	Sep 6	118
Farmington	405 ft	May 16	Jun 1	Sep 26	Sep 14	130
Frenchville Aroostook Ap	988 ft	May 6	May 21	Oct 2	Sep 18	147
Fryeburg E Slopes Ap	445 ft	May 17	Jun 1	Sep 25	Sep 11	128
Ft Kent	610 ft	May 23	Jun 6	Sep 24	Sep 11	121
Gardiner	133 ft	May 1	May 14	Oct 11	Sep 30	163
Grand Lake Stream	290 ft	May 4	May 18	Oct 10	Oct 1	157
Gray	378 ft	Apr 28	May 10	Oct 19	Oct 5	172
Greenville Maine Forestry Svc	1,037 ft	May 7	May 20	Oct 9	Sep 27	153
Harmony	320 ft	May 11	May 25	Oct 1	Sep 18	141
Hartford	705 ft	May 6	May 21	Oct 3	Sep 23	148
Hollis	304 ft	May 14	May 28	Sep 30	Sep 16	136
Houlton 5n	390 ft	May 19	Jun 2	Sep 23	Sep 9	125
Houlton Intl Ap	476 ft	May 27	Jun 10	Sep 18	Sep 5	115
Jackman	1,214 ft	May 26	Jun 7	Sep 23	Sep 8	119
Jonesboro	194 ft	May 3	May 16	Oct 9	Sep 27	158
Kennebunkport	20 ft	May 9	May 22	Oct 3	Sep 20	146
Lewiston	180 ft	Apr 25	May 6	Oct 19	Oct 5	177
Limestone 4 Nnw	737 ft	May 16	Jun 1	Sep 24	Sep 12	129
Lincoln Sanitary District/Wtp	190 ft	May 4	May 16	Oct 6	Sep 24	153
Livermore Falls 1 E	380 ft	May 11	May 24	Sep 29	Sep 16	138
Long Falls Dam	1,160 ft	May 13	May 27	Sep 30	Sep 15	138
Madison	220 ft	May 8	May 20	Oct 5	Sep 24	149
Middle Dam	1,460 ft	May 19	May 31	Oct 1	Sep 19	133
Millinocket Muni Ap	406 ft	May 8	May 24	Oct 1	Sep 19	143
Millinocket Wastewater	360 ft	May 17	May 31	Sep 29	Sep 17	133
Millinocket	360 ft	May 9	May 24	Oct 5	Sep 23	147
Moosehead	1,037 ft	May 13	May 29	Sep 30	Sep 16	137
New Sharon	480 ft	May 7	May 22	Oct 2	Sep 20	146
Newcastle	213 ft	Apr 27	May 10	Oct 18	Oct 3	172
Old Town 2 W	127 ft	May 13	May 28	Sep 28	Sep 16	137
Orono	115 ft	May 1	May 14	Oct 6	Sep 24	157
Patten 2	820 ft	May 13	May 30	Sep 30	Sep 18	138
Pittston Farm	1,100 ft	May 20	Jun 3	Sep 23	Sep 8	123
Pittston Farms Nepp	1,076 ft	May 21	Jun 4	Sep 21	Sep 9	122
Poland	570 ft	May 3	May 16	Oct 7	Sep 27	157
Portland Intl Jetport	45 ft	Apr 26	May 7	Oct 15	Oct 2	170
Presque Isle	599 ft	May 14	Jun 1	Sep 26	Sep 10	131
Rangeley 2 Nw	1,780 ft	May 23	Jun 5	Sep 24	Sep 9	123
Rangeley	1,530 ft	May 23	Jun 3	Sep 27	Sep 14	127
Robbinston	115 ft	May 5	May 18	Oct 13	Oct 1	160
Rumford 1 Sse	630 ft	May 4	May 17	Oct 6	Sep 26	155
Rumford 6sw	630 ft	May 12	May 27	Sep 29	Sep 15	139
Sanford 2 Nnw	289 ft	May 16	May 29	Sep 30	Sep 18	136
Sebec Lake	380 ft	May 16	Jun 1	Oct 1	Sep 19	135
Tenants Harbor	21 ft	Apr 27	May 8	Oct 25	Oct 10	178
Topsfield 2	620 ft	May 6	May 18	Oct 8	Sep 28	155
Turner	565 ft	May 1	May 13	Oct 10	Sep 29	162
Van Buren 2	456 ft	May 23	Jun 5	Sep 26	Sep 11	125
Vanceboro No 2	420 ft	May 13	May 28	Oct 1	Sep 20	139
W Rockport 1 Nnw	361 ft	Apr 27	May 9	Oct 19	Oct 5	175
Waterville Trtmt Plt	73 ft	May 2	May 14	Oct 10	Sep 30	159
Wesley	410 ft	May 2	May 12	Oct 15	Oct 1	164
West Buxton 2 Nnw	220 ft	May 7	May 18	Oct 4	Sep 23	148
Westport Island	90 ft	Apr 28	May 9	Oct 21	Oct 5	175
Windham 2nw	443 ft	Apr 30	May 12	Oct 20	Oct 5	172
Wiscasset Ap	68 ft	May 8	May 20	Oct 7	Sep 24	151
Woodland	123 ft	Apr 21	May 2	Oct 26	Oct 7	185

Plan your garden with these dates

Enter your ZIP code in the planner: it picks the nearest of these stations and dates every crop in your beds from its frosts. Free, in your browser.

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Questions

When is the last frost in Maine?

It depends on where you are. The typical last spring frost at Maine's NOAA stations ranges from April 21 to June 2, and half of them have had it by May 8. Enter your ZIP code above for the station nearest you.

When is the first frost in Maine?

Typically between September 13 and October 26, depending on the station; the median is October 2. Plan fall crops back from your own station's date.

What do "typical" and "safer" mean?

With the typical (50%) last-frost date, half of years still have a frost after it. With the safer (10%) date, only one year in ten does. In fall it's the other way around: the safer date is the earlier one.

Sources

NOAA National Centers for Environmental Information, U.S. Climate Normals 1991–2020 (annual/seasonal, by station: freeze dates at 32 °F)

Maine Frost Dates

Every station in Maine

Plan your garden with these dates

Questions

Other states

Sources