Last frost dates in Maine
82 NOAA weather stations in Maine have thirty years of frost records. The median station sees its last 32 °F night around May 8; across the state that ranges from Apr 21 to Jun 2, so pick the station nearest you rather than a state-wide figure.
| Plan sowing from this date | ||||||
|---|---|---|---|---|---|---|
| WOODLAND | Apr 21 | May 2 | Apr 9 | Oct 26 | 185 | Plan sowing from this date → |
| LEWISTON | Apr 25 | May 6 | Apr 11 | Oct 19 | 177 | Plan sowing from this date → |
| PORTLAND INTL JETPORT | Apr 26 | May 7 | Apr 16 | Oct 15 | 170 | Plan sowing from this date → |
| ACADIA NP | Apr 27 | May 8 | Apr 15 | Oct 22 | 177 | Plan sowing from this date → |
| AUGUSTA STATE AP | Apr 27 | May 7 | Apr 15 | Oct 16 | 172 | Plan sowing from this date → |
| NEWCASTLE | Apr 27 | May 10 | Apr 16 | Oct 18 | 172 | Plan sowing from this date → |
| TENANTS HARBOR | Apr 27 | May 8 | Apr 17 | Oct 25 | 178 | Plan sowing from this date → |
| W ROCKPORT 1 NNW | Apr 27 | May 9 | Apr 17 | Oct 19 | 175 | Plan sowing from this date → |
| GRAY | Apr 28 | May 10 | Apr 15 | Oct 19 | 172 | Plan sowing from this date → |
| WESTPORT ISLAND | Apr 28 | May 9 | Apr 16 | Oct 21 | 175 | Plan sowing from this date → |
| EASTPORT | Apr 29 | May 11 | Apr 16 | Oct 25 | 178 | Plan sowing from this date → |
| WINDHAM 2NW | Apr 30 | May 12 | Apr 18 | Oct 20 | 172 | Plan sowing from this date → |
| CAPE NEDDICK | May 1 | May 14 | Apr 20 | Oct 14 | 165 | Plan sowing from this date → |
| GARDINER | May 1 | May 14 | Apr 20 | Oct 11 | 163 | Plan sowing from this date → |
| ORONO | May 1 | May 14 | Apr 22 | Oct 6 | 157 | Plan sowing from this date → |
| TURNER | May 1 | May 13 | Apr 19 | Oct 10 | 162 | Plan sowing from this date → |
| BRUNSWICK NAS | May 2 | May 14 | Apr 24 | Oct 10 | 160 | Plan sowing from this date → |
| WATERVILLE TRTMT PLT | May 2 | May 14 | Apr 23 | Oct 10 | 159 | Plan sowing from this date → |
| WESLEY | May 2 | May 12 | Apr 21 | Oct 15 | 164 | Plan sowing from this date → |
| JONESBORO | May 3 | May 16 | Apr 22 | Oct 9 | 158 | Plan sowing from this date → |
| POLAND | May 3 | May 16 | Apr 23 | Oct 7 | 157 | Plan sowing from this date → |
| BANGOR INTL AP | May 4 | May 17 | Apr 24 | Oct 4 | 152 | Plan sowing from this date → |
| GRAND LAKE STREAM | May 4 | May 18 | Apr 24 | Oct 10 | 157 | Plan sowing from this date → |
| LINCOLN SANITARY DISTRICT/WTP | May 4 | May 16 | Apr 25 | Oct 6 | 153 | Plan sowing from this date → |
| RUMFORD 1 SSE | May 4 | May 17 | Apr 23 | Oct 6 | 155 | Plan sowing from this date → |
| BRIDGTON 3 NW | May 5 | May 17 | Apr 26 | Oct 5 | 151 | Plan sowing from this date → |
| ROBBINSTON | May 5 | May 18 | Apr 24 | Oct 13 | 160 | Plan sowing from this date → |
| BETHEL 6 SSE | May 6 | May 19 | Apr 27 | Oct 2 | 147 | Plan sowing from this date → |
| E SANGERVILLE | May 6 | May 20 | Apr 25 | Oct 7 | 153 | Plan sowing from this date → |
| FRENCHVILLE AROOSTOOK AP | May 6 | May 21 | Apr 25 | Oct 2 | 147 | Plan sowing from this date → |
| HARTFORD | May 6 | May 21 | Apr 24 | Oct 3 | 148 | Plan sowing from this date → |
| TOPSFIELD 2 | May 6 | May 18 | Apr 26 | Oct 8 | 155 | Plan sowing from this date → |
| BELFAST | May 7 | May 21 | Apr 28 | Oct 5 | 151 | Plan sowing from this date → |
| CARIBOU MUNI AP | May 7 | May 24 | Apr 27 | Oct 1 | 143 | Plan sowing from this date → |
| GREENVILLE MAINE FORESTRY SVC | May 7 | May 20 | Apr 27 | Oct 9 | 153 | Plan sowing from this date → |
| NEW SHARON | May 7 | May 22 | Apr 28 | Oct 2 | 146 | Plan sowing from this date → |
| WEST BUXTON 2 NNW | May 7 | May 18 | Apr 28 | Oct 4 | 148 | Plan sowing from this date → |
| CORINNA | May 8 | May 23 | Apr 27 | Oct 3 | 148 | Plan sowing from this date → |
| E SURRY | May 8 | May 23 | Apr 27 | Oct 9 | 152 | Plan sowing from this date → |
| MADISON | May 8 | May 20 | Apr 28 | Oct 5 | 149 | Plan sowing from this date → |
| MILLINOCKET MUNI AP | May 8 | May 24 | Apr 27 | Oct 1 | 143 | Plan sowing from this date → |
| WISCASSET AP | May 8 | May 20 | Apr 26 | Oct 7 | 151 | Plan sowing from this date → |
| KENNEBUNKPORT | May 9 | May 22 | Apr 28 | Oct 3 | 146 | Plan sowing from this date → |
| MILLINOCKET | May 9 | May 24 | Apr 28 | Oct 5 | 147 | Plan sowing from this date → |
| BATH | May 10 | May 23 | Apr 28 | Oct 6 | 149 | Plan sowing from this date → |
| HARMONY | May 11 | May 25 | Apr 30 | Oct 1 | 141 | Plan sowing from this date → |
| LIVERMORE FALLS 1 E | May 11 | May 24 | Apr 29 | Sep 29 | 138 | Plan sowing from this date → |
| BARNARD | May 12 | May 26 | Apr 30 | Oct 1 | 141 | Plan sowing from this date → |
| EAST HIRAM | May 12 | May 25 | May 1 | Oct 1 | 140 | Plan sowing from this date → |
| RUMFORD 6SW | May 12 | May 27 | Apr 30 | Sep 29 | 139 | Plan sowing from this date → |
| LONG FALLS DAM | May 13 | May 27 | Apr 30 | Sep 30 | 138 | Plan sowing from this date → |
| MOOSEHEAD | May 13 | May 29 | May 2 | Sep 30 | 137 | Plan sowing from this date → |
| OLD TOWN 2 W | May 13 | May 28 | Apr 30 | Sep 28 | 137 | Plan sowing from this date → |
| PATTEN 2 | May 13 | May 30 | May 1 | Sep 30 | 138 | Plan sowing from this date → |
| VANCEBORO NO 2 | May 13 | May 28 | Apr 30 | Oct 1 | 139 | Plan sowing from this date → |
| HOLLIS | May 14 | May 28 | May 3 | Sep 30 | 136 | Plan sowing from this date → |
| PRESQUE ISLE | May 14 | Jun 1 | Apr 30 | Sep 26 | 131 | Plan sowing from this date → |
| DOVER-FOXCROFT WWTP | May 15 | May 28 | Apr 30 | Sep 28 | 134 | Plan sowing from this date → |
| DURHAM | May 15 | May 28 | May 1 | Oct 2 | 139 | Plan sowing from this date → |
| FARMINGTON | May 16 | Jun 1 | May 3 | Sep 26 | 130 | Plan sowing from this date → |
| LIMESTONE 4 NNW | May 16 | Jun 1 | May 1 | Sep 24 | 129 | Plan sowing from this date → |
| SANFORD 2 NNW | May 16 | May 29 | May 2 | Sep 30 | 136 | Plan sowing from this date → |
| SEBEC LAKE | May 16 | Jun 1 | May 3 | Oct 1 | 135 | Plan sowing from this date → |
| FRYEBURG E SLOPES AP | May 17 | Jun 1 | May 2 | Sep 25 | 128 | Plan sowing from this date → |
| MILLINOCKET WASTEWATER | May 17 | May 31 | May 1 | Sep 29 | 133 | Plan sowing from this date → |
| ANDOVER 2 | May 19 | Jun 1 | May 5 | Sep 25 | 129 | Plan sowing from this date → |
| HOULTON 5N | May 19 | Jun 2 | May 3 | Sep 23 | 125 | Plan sowing from this date → |
| MIDDLE DAM | May 19 | May 31 | May 5 | Oct 1 | 133 | Plan sowing from this date → |
| PITTSTON FARM | May 20 | Jun 3 | May 6 | Sep 23 | 123 | Plan sowing from this date → |
| PITTSTON FARMS NEPP | May 21 | Jun 4 | May 8 | Sep 21 | 122 | Plan sowing from this date → |
| BRASSUA DAM | May 23 | Jun 4 | May 7 | Sep 29 | 128 | Plan sowing from this date → |
| FT KENT | May 23 | Jun 6 | May 8 | Sep 24 | 121 | Plan sowing from this date → |
| RANGELEY | May 23 | Jun 3 | May 10 | Sep 27 | 127 | Plan sowing from this date → |
| RANGELEY 2 NW | May 23 | Jun 5 | May 9 | Sep 24 | 123 | Plan sowing from this date → |
| VAN BUREN 2 | May 23 | Jun 5 | May 8 | Sep 26 | 125 | Plan sowing from this date → |
| EUSTIS | May 24 | Jun 6 | May 8 | Sep 21 | 118 | Plan sowing from this date → |
| BRIDGEWATER | May 25 | Jun 7 | May 9 | Sep 18 | 115 | Plan sowing from this date → |
| DANFORTH | May 25 | Jun 8 | May 10 | Sep 24 | 119 | Plan sowing from this date → |
| JACKMAN | May 26 | Jun 7 | May 10 | Sep 23 | 119 | Plan sowing from this date → |
| HOULTON INTL AP | May 27 | Jun 10 | May 9 | Sep 18 | 115 | Plan sowing from this date → |
| CLAYTON LAKE | May 30 | Jun 12 | May 12 | Sep 13 | 106 | Plan sowing from this date → |
| ALLAGASH | Jun 2 | Jun 21 | May 21 | Sep 15 | 102 | Plan sowing from this date → |
How to read the three dates
Average is the date by which, in half of the years between 1991 and 2020, the last 32 °F night had already happened. Safe is later: only one year in ten saw a frost after it, which is the date to transplant tomatoes and peppers, both killed by a single frost. Early is the risky end, with a frost after it in nine years out of ten.
Every figure is for the weather station, not for your garden. A valley bottom, a north slope or a spot near a lake can run a week or two either way. Cities are warmer than the countryside around them.
Where the numbers come from
The dates are NOAA's U.S. Climate Normals for 1991 to 2020, computed by the National Centers for Environmental Information for every station with thirty years of daily minimum temperatures. ZIP codes are matched to the nearest such station within 150 km using U.S. Census Bureau ZIP Code Tabulation Area centroids. Stations that never see a frost, such as much of south Florida, report no date and are left out.