Frost dates
Frost dates in Alaska
Typical last spring frost and first fall frost for 163 weather stations across Alaska, from NOAA’s 1991–2020 climate normals.
Last spring frost
Apr 25 – Jun 3
Typical across Alaska (middle: May 16)
First fall frost
Sep 1 – Oct 19
Typical across Alaska (middle: Sep 22)
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 |
|---|---|---|---|
| Alyeska | May 8 | Sep 29 | 144 |
| Amber Lake | May 28 | Sep 13 | 108 |
| Anchorage Forecast Office | May 5 | Sep 29 | 147 |
| Anchorage International Airport | May 5 | Oct 1 | 149 |
| Anchorage Lake Hood Airport | May 1 | Oct 3 | 155 |
| Anchorage Merrill Field | May 1 | Sep 29 | 151 |
| Anchorage Rabbit Creek #2 | May 12 | Sep 26 | 137 |
| Anchorage Upper De Armoun | May 7 | Sep 28 | 144 |
| Anderson Lake | May 16 | Sep 23 | 130 |
| Annette Island Airport | Apr 4 | Oct 31 | 210 |
| Annex Creek | May 3 | Oct 14 | 164 |
| Auke Bay | Apr 27 | Oct 18 | 174 |
| Aurora | May 16 | Sep 6 | 113 |
| Beaver Falls | Apr 4 | Nov 9 | 219 |
| Ben'S Farm | May 12 | Sep 20 | 131 |
| Bethel Airport | May 21 | Sep 22 | 124 |
| Bettles Airport | May 22 | Aug 24 | 94 |
| Big Delta Airport | May 17 | Sep 7 | 113 |
| Big River Lakes | May 7 | Oct 7 | 153 |
| Campbell Creek Sci Ctr | May 28 | Sep 12 | 107 |
| Cannery Creek | May 16 | Oct 3 | 140 |
| Central #2 | May 25 | Aug 26 | 93 |
| Clear Sky | May 24 | Sep 4 | 103 |
| Cold Bay Airport | May 25 | Oct 4 | 132 |
| College 5 NW | May 13 | Sep 15 | 125 |
| College Obsy | May 18 | Sep 6 | 111 |
| Cooper Lake Project | May 18 | Sep 27 | 132 |
| Cooper Landing 5 W | Jun 12 | Sep 1 | 81 |
| Cordova M K Smith Airport | May 23 | Sep 19 | 119 |
| Cordova N | Apr 24 | Oct 19 | 178 |
| Cordova Water Plant | Apr 29 | Oct 13 | 167 |
| Craig | Apr 14 | Nov 1 | 201 |
| Delta 5 NE | Jun 4 | Aug 22 | 79 |
| Delta Junction 20 SE | Jun 5 | Aug 21 | 77 |
| Denali 27 N | May 25 | Sep 8 | 106 |
| Dry Creek | May 30 | Aug 24 | 86 |
| Dutch Harbor | May 6 | Oct 18 | 165 |
| Eagle | May 29 | Aug 23 | 86 |
| Eagle Rvr 5 SE | May 21 | Sep 15 | 117 |
| Eagle Rvr Gakona Circle | May 9 | Sep 26 | 140 |
| Eagle Rvr Nature Ctr | May 16 | Sep 20 | 127 |
| Eaglecrest Base | May 21 | Oct 1 | 133 |
| Eielson Field | May 20 | Sep 1 | 104 |
| Eklutna Wtp | May 18 | Sep 20 | 125 |
| Elfin Cove | Apr 26 | Nov 1 | 189 |
| Ester | May 24 | Sep 1 | 100 |
| Fairbanks 11 NE | May 12 | Sep 16 | 127 |
| Fairbanks Airport #2 | May 16 | Sep 8 | 115 |
| Fairbanks International Airport | May 13 | Sep 13 | 123 |
| Fairbanks Midtown | May 13 | Sep 10 | 120 |
| Farewell Lake | May 30 | Sep 5 | 98 |
| Fort Knox Mine | May 12 | Sep 17 | 128 |
| Fort Richardson Wtp | May 9 | Sep 26 | 140 |
| Fox 2 SE | May 28 | Sep 1 | 96 |
| Galena | May 18 | Sep 8 | 113 |
| Gilmore Creek | Jun 1 | Aug 28 | 88 |
| Glacier Bay | May 6 | Oct 10 | 157 |
| Glen Alps | May 18 | Sep 23 | 128 |
| Glennallen 64 N | Jun 5 | Aug 24 | 80 |
| Gulkana Airport | Jun 7 | Aug 21 | 75 |
| Gustavus | May 30 | Sep 16 | 109 |
| Gustavus 2 NE | May 28 | Sep 25 | 120 |
| Haines #2 | Apr 30 | Oct 7 | 160 |
| Haines 40 NW | May 24 | Sep 20 | 119 |
| Haines Airport | Apr 25 | Oct 12 | 170 |
| Hayes River | Jun 2 | Sep 8 | 98 |
| Healy | May 27 | Sep 1 | 97 |
| Hidden Falls Hatchery | Apr 29 | Oct 25 | 179 |
| Homer 8 NW | May 16 | Sep 30 | 137 |
| Homer 9 E | May 27 | Sep 22 | 118 |
| Homer Airport | May 10 | Sep 29 | 142 |
| Hoonah | May 9 | Oct 4 | 148 |
| Hope | May 18 | Sep 24 | 129 |
| Hyder | May 4 | Oct 11 | 160 |
| Iliamna Airport | May 10 | Oct 1 | 144 |
| Intricate Bay | Jun 4 | Sep 12 | 100 |
| Juneau Dwtn | Apr 20 | Oct 22 | 185 |
| Juneau Forecast Office | May 9 | Oct 4 | 148 |
| Juneau International Airport | May 4 | Oct 3 | 152 |
| Juneau Lena Pt | Apr 11 | Nov 1 | 204 |
| Juneau Mile 17 | Apr 29 | Oct 20 | 174 |
| Kaltag Airport | May 25 | Sep 3 | 101 |
| Kenai 29 ENE | Jun 1 | Sep 8 | 99 |
| Kenai 9 N | May 18 | Sep 22 | 127 |
| Kenai Municipal Airport | May 24 | Sep 12 | 111 |
| Ketchikan 10 N | Apr 20 | Oct 26 | 189 |
| Ketchikan International Airport | Apr 22 | Oct 23 | 184 |
| Keystone Ridge | May 15 | Sep 16 | 124 |
| King Salmon | May 26 | Sep 15 | 112 |
| King Salmon 42 SE | Jun 9 | Sep 11 | 94 |
| Kitoi Bay | May 11 | Oct 6 | 148 |
| Kivalina Airport | Jun 10 | Sep 11 | 93 |
| Klawock Airport | Apr 29 | Oct 16 | 170 |
| Kobe Hill | May 24 | Sep 2 | 101 |
| Kodiak Airport | May 5 | Oct 3 | 151 |
| Kodiak Water Plant | Apr 29 | Oct 14 | 168 |
| Kotzebue Ralph Wein Airport | Jun 5 | Sep 24 | 111 |
| Lake Susitna | May 30 | Sep 4 | 97 |
| Lazy Mountain | May 22 | Sep 16 | 117 |
| Little Port Walter | Apr 21 | Oct 31 | 193 |
| Little Su At Hatcher Pass Brg | May 18 | Sep 18 | 123 |
| Main Bay | May 19 | Oct 6 | 140 |
| Matanuska Experiment Farm | May 14 | Sep 20 | 129 |
| Mcgrath Airport | May 13 | Sep 13 | 123 |
| Mckinley Park | Jun 6 | Aug 25 | 80 |
| Metlakatla 6 S | Apr 14 | Oct 25 | 194 |
| Mile 42 Steese | May 28 | Aug 26 | 90 |
| Minchumina | May 13 | Sep 17 | 127 |
| Monashka Creek Dam | May 27 | Sep 23 | 119 |
| Moose Pass 3 NW | May 31 | Sep 8 | 100 |
| N Pole | May 18 | Sep 5 | 110 |
| N Pole 1 N | May 22 | Sep 2 | 103 |
| Nabesna | Jun 4 | Sep 1 | 89 |
| Nenana Municipal Airport | May 15 | Sep 11 | 119 |
| Nome Municipal Airport | Jun 5 | Sep 3 | 90 |
| Northway Airport | May 26 | Sep 1 | 98 |
| Ouzinkie | May 9 | Oct 4 | 148 |
| Palmer Job Corps | Apr 24 | Oct 4 | 163 |
| Palmer Municipal Airport | May 6 | Sep 25 | 142 |
| Pelican | May 4 | Oct 19 | 168 |
| Petersburg 1 | Apr 29 | Oct 17 | 171 |
| Port Alcan | May 28 | Aug 29 | 93 |
| Port Alexander | Apr 18 | Nov 5 | 201 |
| Port Alsworth | May 12 | Sep 24 | 135 |
| Port Alsworth 1 SW | Jun 2 | Sep 12 | 102 |
| Port San Juan | May 10 | Oct 7 | 150 |
| Portage Glacier V C | May 27 | Sep 12 | 108 |
| Pt Baker | Apr 19 | Oct 25 | 189 |
| Puntilla | Jun 7 | Sep 2 | 87 |
| Ruby 44 ESE | May 22 | Sep 3 | 104 |
| Sand Point 1 ENE | May 11 | Oct 18 | 160 |
| Seldovia Airport | May 10 | Oct 1 | 144 |
| Seward 19 N | May 21 | Sep 26 | 128 |
| Seward Airport | May 2 | Oct 7 | 158 |
| Silver Lake | May 31 | Sep 3 | 95 |
| Sitka 1 NE | May 3 | Oct 18 | 168 |
| Sitka Airport | Apr 12 | Nov 1 | 203 |
| Skagway | May 6 | Oct 1 | 148 |
| Skagway Airport | Apr 21 | Oct 17 | 179 |
| Skwentna | May 23 | Sep 9 | 109 |
| Snettisham Pwr Plt | May 5 | Oct 15 | 163 |
| Soldotna 5 SSW | Jun 11 | Sep 1 | 82 |
| St George Island Airport | May 31 | Oct 5 | 127 |
| St Paul Island Airport | Jun 4 | Sep 28 | 116 |
| St. Paul 4 NE | Jun 5 | Sep 28 | 115 |
| Sterling 6 SW | May 20 | Sep 21 | 124 |
| Sutton 1 W | Jun 1 | Sep 6 | 97 |
| Talkeetna Airport | May 16 | Sep 16 | 123 |
| Tanana Calhoun Mem Airport | May 29 | Aug 28 | 91 |
| Thorne Bay | May 1 | Oct 13 | 165 |
| Tok #2 | Jun 3 | Aug 27 | 85 |
| Two Rivers | May 30 | Sep 2 | 95 |
| University Experiment Station | May 16 | Sep 8 | 115 |
| Valdez | Apr 30 | Oct 2 | 155 |
| Valdez | May 14 | Sep 22 | 131 |
| Wally Noerenberg Hatchery | May 20 | Oct 9 | 142 |
| Whites Crossing | May 29 | Sep 7 | 101 |
| Whitestone Farms | May 26 | Sep 2 | 99 |
| Whittier | Apr 25 | Oct 14 | 172 |
| Willow West | May 15 | Sep 18 | 126 |
| Wrangell Airport | Apr 11 | Nov 1 | 204 |
| Yakutat 3 SSE | May 13 | Sep 26 | 136 |
| Yakutat State Airport | May 20 | Sep 23 | 126 |
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.