Frost Dates in Maine
Across 82 NOAA weather stations in Maine, the average last spring frost falls between April 21 at Woodland and June 2 at Allagash. At a typical Maine station it is around May 8, with the first fall frost around October 2 and a frost-free season of about 147 days.
Find the frost dates for your ZIP code
A typical Maine season
What shapes frost dates in Maine
- The frost-free season ranges from 102 days at Allagash to 185 days at Woodland.
- Elevation matters: Rangeley 2 NW, at 1,780 ft, averages its last frost on May 23, while Belfast, at 20 ft, averages May 7.
- Gardens in valleys and low spots, where cold air settles, often frost a week or more later in spring than the nearest station.
Frost dates at major airports
| Station | Last frost | Safer date | First frost | Season (days) |
|---|---|---|---|---|
| Augusta State Airport | Apr 27 | May 7 | Oct 16 | 172 |
| Bangor Intl Airport | May 4 | May 17 | Oct 4 | 152 |
| Brunswick Nas | May 2 | May 14 | Oct 10 | 160 |
| Caribou Muni Airport | May 7 | May 24 | Oct 1 | 143 |
| Frenchville Aroostook Airport | May 6 | May 21 | Oct 2 | 147 |
| Fryeburg E Slopes Airport | May 17 | Jun 1 | Sep 25 | 128 |
| Greenville Maine Forestry Svc | May 7 | May 20 | Oct 9 | 153 |
| Houlton Intl Airport | May 27 | Jun 10 | Sep 18 | 115 |
| Limestone 4 NNW | May 16 | Jun 1 | Sep 24 | 129 |
| Millinocket Muni Airport | May 8 | May 24 | Oct 1 | 143 |
| Old Town 2 W | May 13 | May 28 | Sep 28 | 137 |
| Portland Intl Jetport | Apr 26 | May 7 | Oct 15 | 170 |
| Wiscasset Airport | May 8 | May 20 | Oct 7 | 151 |
All 82 weather stations in Maine
| Station | Elevation (ft) | Last frost | Safer date | First frost | Season (days) |
|---|---|---|---|---|---|
| Acadia Np | 470 | Apr 27 | May 8 | Oct 22 | 177 |
| Allagash | 596 | Jun 2 | Jun 21 | Sep 15 | 102 |
| Andover 2 | 822 | May 19 | Jun 1 | Sep 25 | 129 |
| Augusta State Airport | 350 | Apr 27 | May 7 | Oct 16 | 172 |
| Bangor Intl Airport | 148 | May 4 | May 17 | Oct 4 | 152 |
| Barnard | 545 | May 12 | May 26 | Oct 1 | 141 |
| Bath | 25 | May 10 | May 23 | Oct 6 | 149 |
| Belfast | 20 | May 7 | May 21 | Oct 5 | 151 |
| Bethel 6 SSE | 790 | May 6 | May 19 | Oct 2 | 147 |
| Brassua Dam | 1,069 | May 23 | Jun 4 | Sep 29 | 128 |
| Bridgewater | 420 | May 25 | Jun 7 | Sep 18 | 115 |
| Bridgton 3 NW | 508 | May 5 | May 17 | Oct 5 | 151 |
| Brunswick Nas | 70 | May 2 | May 14 | Oct 10 | 160 |
| Cape Neddick | 152 | May 1 | May 14 | Oct 14 | 165 |
| Caribou Muni Airport | 624 | May 7 | May 24 | Oct 1 | 143 |
| Clayton Lake | 1,000 | May 30 | Jun 12 | Sep 13 | 106 |
| Corinna | 297 | May 8 | May 23 | Oct 3 | 148 |
| Danforth | 475 | May 25 | Jun 8 | Sep 24 | 119 |
| Dover-Foxcroft Wwtp | 370 | May 15 | May 28 | Sep 28 | 134 |
| Durham | 140 | May 15 | May 28 | Oct 2 | 139 |
| E Sangerville | 635 | May 6 | May 20 | Oct 7 | 153 |
| E Surry | 105 | May 8 | May 23 | Oct 9 | 152 |
| East Hiram | 528 | May 12 | May 25 | Oct 1 | 140 |
| Eastport | 85 | Apr 29 | May 11 | Oct 25 | 178 |
| Eustis | 1,260 | May 24 | Jun 6 | Sep 21 | 118 |
| Farmington | 405 | May 16 | Jun 1 | Sep 26 | 130 |
| Frenchville Aroostook Airport | 988 | May 6 | May 21 | Oct 2 | 147 |
| Fryeburg E Slopes Airport | 445 | May 17 | Jun 1 | Sep 25 | 128 |
| Ft Kent | 610 | May 23 | Jun 6 | Sep 24 | 121 |
| Gardiner | 133 | May 1 | May 14 | Oct 11 | 163 |
| Grand Lake Stream | 290 | May 4 | May 18 | Oct 10 | 157 |
| Gray | 378 | Apr 28 | May 10 | Oct 19 | 172 |
| Greenville Maine Forestry Svc | 1,037 | May 7 | May 20 | Oct 9 | 153 |
| Harmony | 320 | May 11 | May 25 | Oct 1 | 141 |
| Hartford | 705 | May 6 | May 21 | Oct 3 | 148 |
| Hollis | 304 | May 14 | May 28 | Sep 30 | 136 |
| Houlton 5N | 390 | May 19 | Jun 2 | Sep 23 | 125 |
| Houlton Intl Airport | 476 | May 27 | Jun 10 | Sep 18 | 115 |
| Jackman | 1,214 | May 26 | Jun 7 | Sep 23 | 119 |
| Jonesboro | 194 | May 3 | May 16 | Oct 9 | 158 |
| Kennebunkport | 20 | May 9 | May 22 | Oct 3 | 146 |
| Lewiston | 180 | Apr 25 | May 6 | Oct 19 | 177 |
| Limestone 4 NNW | 737 | May 16 | Jun 1 | Sep 24 | 129 |
| Lincoln Sanitary District/wtp | 190 | May 4 | May 16 | Oct 6 | 153 |
| Livermore Falls 1 E | 380 | May 11 | May 24 | Sep 29 | 138 |
| Long Falls Dam | 1,160 | May 13 | May 27 | Sep 30 | 138 |
| Madison | 220 | May 8 | May 20 | Oct 5 | 149 |
| Middle Dam | 1,460 | May 19 | May 31 | Oct 1 | 133 |
| Millinocket | 360 | May 9 | May 24 | Oct 5 | 147 |
| Millinocket Muni Airport | 406 | May 8 | May 24 | Oct 1 | 143 |
| Millinocket Wastewater | 360 | May 17 | May 31 | Sep 29 | 133 |
| Moosehead | 1,037 | May 13 | May 29 | Sep 30 | 137 |
| New Sharon | 480 | May 7 | May 22 | Oct 2 | 146 |
| Newcastle | 213 | Apr 27 | May 10 | Oct 18 | 172 |
| Old Town 2 W | 127 | May 13 | May 28 | Sep 28 | 137 |
| Orono | 115 | May 1 | May 14 | Oct 6 | 157 |
| Patten 2 | 820 | May 13 | May 30 | Sep 30 | 138 |
| Pittston Farm | 1,100 | May 20 | Jun 3 | Sep 23 | 123 |
| Pittston Farms Nepp | 1,076 | May 21 | Jun 4 | Sep 21 | 122 |
| Poland | 570 | May 3 | May 16 | Oct 7 | 157 |
| Portland Intl Jetport | 45 | Apr 26 | May 7 | Oct 15 | 170 |
| Presque Isle | 599 | May 14 | Jun 1 | Sep 26 | 131 |
| Rangeley | 1,530 | May 23 | Jun 3 | Sep 27 | 127 |
| Rangeley 2 NW | 1,780 | May 23 | Jun 5 | Sep 24 | 123 |
| Robbinston | 115 | May 5 | May 18 | Oct 13 | 160 |
| Rumford 1 SSE | 630 | May 4 | May 17 | Oct 6 | 155 |
| Rumford 6SW | 630 | May 12 | May 27 | Sep 29 | 139 |
| Sanford 2 NNW | 289 | May 16 | May 29 | Sep 30 | 136 |
| Sebec Lake | 380 | May 16 | Jun 1 | Oct 1 | 135 |
| Tenants Harbor | 21 | Apr 27 | May 8 | Oct 25 | 178 |
| Topsfield 2 | 620 | May 6 | May 18 | Oct 8 | 155 |
| Turner | 565 | May 1 | May 13 | Oct 10 | 162 |
| Van Buren 2 | 456 | May 23 | Jun 5 | Sep 26 | 125 |
| Vanceboro No 2 | 420 | May 13 | May 28 | Oct 1 | 139 |
| W Rockport 1 NNW | 361 | Apr 27 | May 9 | Oct 19 | 175 |
| Waterville Trtmt Plt | 73 | May 2 | May 14 | Oct 10 | 159 |
| Wesley | 410 | May 2 | May 12 | Oct 15 | 164 |
| West Buxton 2 NNW | 220 | May 7 | May 18 | Oct 4 | 148 |
| Westport Island | 90 | Apr 28 | May 9 | Oct 21 | 175 |
| Windham 2NW | 443 | Apr 30 | May 12 | Oct 20 | 172 |
| Wiscasset Airport | 68 | May 8 | May 20 | Oct 7 | 151 |
| Woodland | 123 | Apr 21 | May 2 | Oct 26 | 185 |
No station matches that name. Try a nearby town, or look up your ZIP code above.
Last frost and first frost are averages (a 50% chance of frost later in spring or earlier in fall). Safer date is the spring date with only a 10% chance of a later frost.
Using these dates
Plant hardy crops like peas and spinach several weeks before your last frost, and tender crops like tomatoes and peppers after it, once nights stay above 50°F. The Seed Starting Calculator turns your frost date into sowing and planting dates, and When to Plant Tomatoes explains the timing in detail.
Data: NOAA National Centers for Environmental Information, U.S. Climate Normals 1991–2020, 32°F threshold.
Frost dates in other states
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