Maine frost dates
Across 82 weather stations in Maine, the median last spring frost runs from Apr 21 in Woodland to Jun 2 in Allagash, and the first fall frost from Sep 13 to Oct 26.
Maine at a glance
- Weather stations
- 82
- Earliest last frost
- Apr 21 Woodland
- Latest last frost
- Jun 2 Allagash
- Longest season
- 185 days Woodland
- Typical season
- about 146 frost-free days
- Hardiness zones
- Zones 3b to 6a
Frost dates by weather station
| Weather station | Last spring frost | First fall frost | Frost-free days | Zone |
|---|---|---|---|---|
| Acadia National Park | Apr 27 | Oct 22 | 177 | 6a |
| Allagash | Jun 2 | Sep 15 | 102 | 4b |
| Andover | May 19 | Sep 25 | 129 | 4b |
| Augusta State Airport | Apr 27 | Oct 16 | 172 | 5b |
| Bangor International Airport | May 4 | Oct 4 | 152 | 5a |
| Barnard | May 12 | Oct 1 | 141 | 5a |
| Bath | May 10 | Oct 6 | 149 | 6a |
| Belfast | May 7 | Oct 5 | 151 | 5b |
| Bethel | May 6 | Oct 2 | 147 | 5a |
| Brassua Dam | May 23 | Sep 29 | 128 | 4b |
| Bridgewater | May 25 | Sep 18 | 115 | 4a |
| Bridgton | May 5 | Oct 5 | 151 | 5a |
| Brunswick Naval Air Station | May 2 | Oct 10 | 160 | 5b |
| Cape Neddick | May 1 | Oct 14 | 165 | 6a |
| Caribou Municipal Airport | May 7 | Oct 1 | 143 | 4a |
| Clayton Lake | May 30 | Sep 13 | 106 | 3b |
| Corinna | May 8 | Oct 3 | 148 | 4b |
| Danforth | May 25 | Sep 24 | 119 | 4b |
| Dover-Foxcroft Wastewater Plant | May 15 | Sep 28 | 134 | 5a |
| Durham | May 15 | Oct 2 | 139 | 5b |
| East Hiram | May 12 | Oct 1 | 140 | 5a |
| East Sangerville | May 6 | Oct 7 | 153 | 5a |
| East Surry | May 8 | Oct 9 | 152 | 5b |
| Eastport | Apr 29 | Oct 25 | 178 | 6a |
| Eustis | May 24 | Sep 21 | 118 | 4b |
| Farmington | May 16 | Sep 26 | 130 | 5a |
| Fort Kent | May 23 | Sep 24 | 121 | 4a |
| Frenchville Aroostook Airport | May 6 | Oct 2 | 147 | 4b |
| Fryeburg E Slopes Airport | May 17 | Sep 25 | 128 | 5a |
| Gardiner | May 1 | Oct 11 | 163 | 5b |
| Grand Lake Stream | May 4 | Oct 10 | 157 | 5b |
| Gray | Apr 28 | Oct 19 | 172 | 6a |
| Greenville Maine Forestry Svc | May 7 | Oct 9 | 153 | 4b |
| Harmony | May 11 | Oct 1 | 141 | 5a |
| Hartford | May 6 | Oct 3 | 148 | 5b |
| Hollis | May 14 | Sep 30 | 136 | 5b |
| Houlton | May 19 | Sep 23 | 125 | 4b |
| Houlton International Airport | May 27 | Sep 18 | 115 | 4b |
| Jackman | May 26 | Sep 23 | 119 | 4b |
| Jonesboro | May 3 | Oct 9 | 158 | 5b |
| Kennebunkport | May 9 | Oct 3 | 146 | 6a |
| Lewiston | Apr 25 | Oct 19 | 177 | 5b |
| Limestone | May 16 | Sep 24 | 129 | 4a |
| Lincoln Sanitary District/Wtp | May 4 | Oct 6 | 153 | 5a |
| Livermore Falls | May 11 | Sep 29 | 138 | 5b |
| Long Falls Dam | May 13 | Sep 30 | 138 | 4b |
| Madison | May 8 | Oct 5 | 149 | 5a |
| Middle Dam | May 19 | Oct 1 | 133 | 4b |
| Millinocket | May 9 | Oct 5 | 147 | 5a |
| Millinocket Municipal Airport | May 8 | Oct 1 | 143 | 5a |
| Millinocket Wastewater | May 17 | Sep 29 | 133 | 5a |
| Moosehead | May 13 | Sep 30 | 137 | 4b |
| New Sharon | May 7 | Oct 2 | 146 | 5a |
| Newcastle | Apr 27 | Oct 18 | 172 | 5b |
| Old Town | May 13 | Sep 28 | 137 | 5a |
| Orono | May 1 | Oct 6 | 157 | 5a |
| Patten | May 13 | Sep 30 | 138 | 4b |
| Pittston Farm | May 20 | Sep 23 | 123 | 4b |
| Pittston Farms Nepp | May 21 | Sep 21 | 122 | 4b |
| Poland | May 3 | Oct 7 | 157 | 5b |
| Portland International Jetport | Apr 26 | Oct 15 | 170 | 6a |
| Presque Isle | May 14 | Sep 26 | 131 | 4a |
| Rangeley | May 23 | Sep 27 | 127 | 4b |
| Rangeley 2 mi NW | May 23 | Sep 24 | 123 | 4b |
| Robbinston | May 5 | Oct 13 | 160 | 5b |
| Rumford 1 mi SSE | May 4 | Oct 6 | 155 | 5a |
| Rumford 6 mi SW | May 12 | Sep 29 | 139 | 5a |
| Sanford | May 16 | Sep 30 | 136 | 5b |
| Sebec Lake | May 16 | Oct 1 | 135 | 5a |
| Tenants Harbor | Apr 27 | Oct 25 | 178 | 6a |
| Topsfield | May 6 | Oct 8 | 155 | 5a |
| Turner | May 1 | Oct 10 | 162 | 5b |
| Van Buren | May 23 | Sep 26 | 125 | 4a |
| Vanceboro | May 13 | Oct 1 | 139 | 5a |
| Waterville Treatment Plant | May 2 | Oct 10 | 159 | 5b |
| Wesley | May 2 | Oct 15 | 164 | 5b |
| West Buxton | May 7 | Oct 4 | 148 | 5b |
| West Rockport | Apr 27 | Oct 19 | 175 | 6a |
| Westport Island | Apr 28 | Oct 21 | 175 | 6a |
| Windham | Apr 30 | Oct 20 | 172 | 5b |
| Wiscasset Airport | May 8 | Oct 7 | 151 | 5b |
| Woodland | Apr 21 | Oct 26 | 185 | 5b |
Median dates from NOAA 1991–2020 climate normals. How to read them.