Frost dates
Frost dates in Maine
Typical last spring frost and first fall frost for 82 weather stations across Maine, from NOAA’s 1991–2020 climate normals.
Last spring frost
Apr 28 – May 23
Typical across Maine (middle: May 8)
First fall frost
Sep 23 – Oct 19
Typical across Maine (middle: Oct 2)
Your own yard can differ by weeks from the nearest town. Get frost dates for your exact spot →
By town
| Station | Last spring frost | First fall frost | Frost-free days |
|---|---|---|---|
| Acadia Np | Apr 27 | Oct 22 | 178 |
| Allagash | Jun 2 | Sep 15 | 105 |
| Andover 2 | May 19 | Sep 25 | 129 |
| Augusta State Airport | Apr 27 | Oct 16 | 172 |
| Bangor International Airport | May 4 | Oct 4 | 153 |
| Barnard | May 12 | Oct 1 | 142 |
| Bath | May 10 | Oct 6 | 149 |
| Belfast | May 7 | Oct 5 | 151 |
| Bethel 6 SSE | May 6 | Oct 2 | 149 |
| Brassua Dam | May 23 | Sep 29 | 129 |
| Bridgewater | May 25 | Sep 18 | 116 |
| Bridgton 3 NW | May 5 | Oct 5 | 153 |
| Brunswick NAS | May 2 | Oct 10 | 161 |
| Cape Neddick | May 1 | Oct 14 | 166 |
| Caribou Municipal Airport | May 7 | Oct 1 | 147 |
| Clayton Lake | May 30 | Sep 13 | 106 |
| Corinna | May 8 | Oct 3 | 148 |
| Danforth | May 25 | Sep 24 | 122 |
| Dover-Foxcroft Water Plant | May 15 | Sep 28 | 136 |
| Durham | May 15 | Oct 2 | 140 |
| E Sangerville | May 6 | Oct 7 | 154 |
| E Surry | May 8 | Oct 9 | 154 |
| East Hiram | May 12 | Oct 1 | 142 |
| Eastport | Apr 29 | Oct 25 | 179 |
| Eustis | May 24 | Sep 21 | 120 |
| Farmington | May 16 | Sep 26 | 133 |
| Fort Kent | May 23 | Sep 24 | 124 |
| Frenchville Aroostook Airport | May 6 | Oct 2 | 149 |
| Fryeburg E Slopes Airport | May 17 | Sep 25 | 131 |
| Gardiner | May 1 | Oct 11 | 163 |
| Grand Lake Stream | May 4 | Oct 10 | 159 |
| Gray | Apr 28 | Oct 19 | 174 |
| Greenville Maine Forestry Svc | May 7 | Oct 9 | 155 |
| Harmony | May 11 | Oct 1 | 143 |
| Hartford | May 6 | Oct 3 | 150 |
| Hollis | May 14 | Sep 30 | 139 |
| Houlton 5 N | May 19 | Sep 23 | 127 |
| Houlton International Airport | May 27 | Sep 18 | 114 |
| Jackman | May 26 | Sep 23 | 120 |
| Jonesboro | May 3 | Oct 9 | 159 |
| Kennebunkport | May 9 | Oct 3 | 147 |
| Lewiston | Apr 25 | Oct 19 | 177 |
| Limestone 4 NNW | May 16 | Sep 24 | 131 |
| Lincoln Sanitary District/Wtp | May 4 | Oct 6 | 155 |
| Livermore Falls 1 E | May 11 | Sep 29 | 141 |
| Long Falls Dam | May 13 | Sep 30 | 140 |
| Madison | May 8 | Oct 5 | 150 |
| Middle Dam | May 19 | Oct 1 | 135 |
| Millinocket | May 9 | Oct 5 | 149 |
| Millinocket Municipal Airport | May 8 | Oct 1 | 146 |
| Millinocket Wastewater | May 17 | Sep 29 | 135 |
| Moosehead | May 13 | Sep 30 | 140 |
| New Sharon | May 7 | Oct 2 | 148 |
| Newcastle | Apr 27 | Oct 18 | 174 |
| Old Town 2 W | May 13 | Sep 28 | 138 |
| Orono | May 1 | Oct 6 | 158 |
| Patten 2 | May 13 | Sep 30 | 140 |
| Pittston Farm | May 20 | Sep 23 | 126 |
| Pittston Farms Nepp | May 21 | Sep 21 | 123 |
| Poland | May 3 | Oct 7 | 157 |
| Portland International Jetport | Apr 26 | Oct 15 | 172 |
| Presque Isle | May 14 | Sep 26 | 135 |
| Rangeley | May 23 | Sep 27 | 127 |
| Rangeley 2 NW | May 23 | Sep 24 | 124 |
| Robbinston | May 5 | Oct 13 | 161 |
| Rumford 1 SSE | May 4 | Oct 6 | 155 |
| Rumford 6 SW | May 12 | Sep 29 | 140 |
| Sanford 2 NNW | May 16 | Sep 30 | 137 |
| Sebec Lake | May 16 | Oct 1 | 138 |
| Tenants Harbor | Apr 27 | Oct 25 | 181 |
| Topsfield 2 | May 6 | Oct 8 | 155 |
| Turner | May 1 | Oct 10 | 162 |
| Van Buren 2 | May 23 | Sep 26 | 126 |
| Vanceboro No 2 | May 13 | Oct 1 | 141 |
| W Rockport 1 NNW | Apr 27 | Oct 19 | 175 |
| Waterville Trtmt Plt | May 2 | Oct 10 | 161 |
| Wesley | May 2 | Oct 15 | 166 |
| West Buxton 2 NNW | May 7 | Oct 4 | 150 |
| Westport Island | Apr 28 | Oct 21 | 176 |
| Windham 2 NW | Apr 30 | Oct 20 | 173 |
| Wiscasset Airport | May 8 | Oct 7 | 152 |
| Woodland | Apr 21 | Oct 26 | 188 |
Each date is the median: in half of years the frost comes earlier, in half later. Frost here means a low of 32°F or colder at the station. Low spots and valleys often frost a week or two earlier than these dates; hillsides and city centers later.
Source: NOAA National Centers for Environmental Information, U.S. Climate Normals 1991–2020. The Field almanac also shows how often frost comes early or late, and a reanalysis reading for your exact location.