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Alaska frost dates

Across 163 NOAA climate stations in Alaska, the median last spring frost (32°F) ranges from Apr 4 at Annette Island AP to Jun 12 at Cooper Landing 5 W; the typical station sees its last frost around May 16 and its first fall frost around Sep 22.

“Median” dates have a 50% chance of a later spring frost or an earlier fall frost. “10% risk” dates are the safer choice for tender plants: only 1 year in 10 has frost beyond them. Source: NOAA NCEI 1991–2020 Climate Normals. Elevation matters: within a state, frost dates can differ by a month or more between valleys and hills.

StationElevationLast frost (median)Last frost (10% risk)First frost (median)First frost (10% risk)Growing season
Alyeska272 ftMay 8May 22Sep 29Sep 14142 days
Amber Lake449 ftMay 28Jun 9Sep 13Aug 30107 days
Anchorage Forecast Office131 ftMay 5May 14Sep 29Sep 17147 days
Anchorage Intl AP120 ftMay 5May 15Oct 1Sep 18147 days
Anchorage Lake Hood AP90 ftMay 1May 8Oct 3Sep 22156 days
Anchorage Merrill Fld138 ftMay 1May 9Sep 29Sep 17150 days
Anchorage Rabbit Creek #2913 ftMay 12May 24Sep 26Sep 12137 days
Anchorage Upper De Armoun1,335 ftMay 7May 23Sep 28Sep 16143 days
Anderson Lake458 ftMay 16May 31Sep 23Sep 8128 days
Annette Island AP109 ftApr 4Apr 22Oct 31Oct 15208 days
Annex Creek92 ftMay 3May 18Oct 14Oct 1164 days
Auke Bay44 ftApr 27May 11Oct 18Sep 30172 days
Aurora443 ftMay 16May 29Sep 6Aug 25112 days
Beaver Falls35 ftApr 4Apr 25Nov 9Oct 19218 days
Ben'S Farm127 ftMay 12May 24Sep 20Sep 6129 days
Bethel AP102 ftMay 21Jun 2Sep 22Sep 7122 days
Bettles AP642 ftMay 22Jun 5Aug 24Aug 1094 days
Big Delta AP1,277 ftMay 17May 31Sep 7Aug 23113 days
Big River Lakes60 ftMay 7May 25Oct 7Sep 20151 days
Campbell Creek Sci Ctr258 ftMay 28Jun 6Sep 12Aug 30107 days
Cannery Creek85 ftMay 16May 29Oct 3Sep 21139 days
Central #2920 ftMay 25Jun 6Aug 26Aug 1292 days
Clear Sky646 ftMay 24Jun 12Sep 4Aug 19100 days
Cold Bay AP78 ftMay 25Jun 10Oct 4Sep 20131 days
College 5 Nw978 ftMay 13May 31Sep 15Aug 29122 days
College Obsy597 ftMay 18Jun 1Sep 6Aug 24111 days
Cooper Lake Project505 ftMay 18May 31Sep 27Sep 12130 days
Cooper Landing 5 W375 ftJun 12Jul 2Sep 1Aug 1478 days
Cordova M K Smith AP31 ftMay 23Jun 5Sep 19Sep 5118 days
Cordova N25 ftApr 24May 8Oct 19Oct 4176 days
Cordova Wwtp10 ftApr 29May 13Oct 13Sep 25169 days
Craig43 ftApr 14May 2Nov 1Oct 16201 days
Delta 5 Ne1,060 ftJun 4Jul 17Aug 22Aug 775 days
Delta Junction 20 Se1,125 ftJun 5Jun 30Aug 21Aug 875 days
Denali 27 N2,225 ftMay 25Jun 3Sep 8Aug 26105 days
Dry Creek1,355 ftMay 30Jun 13Aug 24Aug 984 days
Dutch Harbor10 ftMay 6May 22Oct 18Sep 20164 days
Eagle850 ftMay 29Jun 11Aug 23Aug 886 days
Eagle Rvr 5 Se498 ftMay 21Jun 3Sep 15Aug 31116 days
Eagle Rvr Gakona Circle567 ftMay 9May 22Sep 26Sep 12139 days
Eagle Rvr Nature Ctr520 ftMay 16Jun 9Sep 20Sep 4125 days
Eaglecrest Base1,134 ftMay 21Jun 2Oct 1Sep 19132 days
Eielson Fld547 ftMay 20Jun 3Sep 1Aug 20104 days
Eklutna Wtp640 ftMay 18May 30Sep 20Sep 4124 days
Elfin Cove20 ftApr 26May 8Nov 1Oct 15188 days
Ester655 ftMay 24Jun 4Sep 1Aug 1998 days
Fairbanks 11 Ne1,140 ftMay 12May 29Sep 16Aug 29124 days
Fairbanks AP #2427 ftMay 16May 30Sep 8Aug 27113 days
Fairbanks Intl AP432 ftMay 13May 26Sep 13Aug 29121 days
Fairbanks Midtown440 ftMay 13May 28Sep 10Aug 28119 days
Farewell Lake1,060 ftMay 30Jun 15Sep 5Aug 2297 days
Fox 2 Se775 ftMay 28Jun 9Sep 1Aug 1796 days
Ft Knox Mine1,621 ftMay 12May 28Sep 17Aug 29126 days
Ft Richardson Wtp470 ftMay 9May 22Sep 26Sep 9138 days
Galena152 ftMay 18Jun 1Sep 8Aug 24111 days
Gilmore Creek945 ftJun 1Jun 17Aug 28Aug 1387 days
Glacier Bay45 ftMay 6May 26Oct 10Sep 19154 days
Glen Alps2,202 ftMay 18May 31Sep 23Sep 8125 days
Glennallen 64 N2,669 ftJun 5Jun 21Aug 24Aug 1076 days
Gulkana AP1,562 ftJun 7Jul 5Aug 21Aug 873 days
Gustavus40 ftMay 30Jun 22Sep 16Aug 29107 days
Gustavus 2 Ne20 ftMay 28Jun 12Sep 25Aug 29116 days
Haines #295 ftApr 30May 13Oct 7Sep 24160 days
Haines 40NW820 ftMay 24Jun 10Sep 20Sep 1118 days
Haines AP15 ftApr 25May 7Oct 12Sep 30172 days
Hayes River1,000 ftJun 2Jun 11Sep 8Aug 2398 days
Healy1,417 ftMay 27Jun 10Sep 1Aug 1897 days
Hidden Falls Hatchery22 ftApr 29May 15Oct 25Oct 7176 days
Homer 8 Nw1,080 ftMay 16May 30Sep 30Sep 16136 days
Homer 9 E512 ftMay 27Jun 8Sep 22Sep 4116 days
Homer AP64 ftMay 10May 23Sep 29Sep 14141 days
Hoonah130 ftMay 9Jul 4Oct 4Sep 1145 days
Hope180 ftMay 18May 28Sep 24Sep 12127 days
Hyder80 ftMay 4May 23Oct 11Oct 1157 days
Iliamna AP143 ftMay 10May 25Oct 1Sep 17144 days
Intricate Bay120 ftJun 4Jun 22Sep 12Aug 2898 days
Juneau Dwtn50 ftApr 20May 5Oct 22Oct 5183 days
Juneau Forecast Office106 ftMay 9May 24Oct 4Sep 20146 days
Juneau Intl AP16 ftMay 4May 18Oct 3Sep 18150 days
Juneau Lena Pt35 ftApr 11Apr 27Nov 1Oct 13202 days
Juneau Mile 17245 ftApr 29May 10Oct 20Oct 2173 days
Kaltag AP181 ftMay 25Jun 11Sep 3Aug 18101 days
Kenai 29 Ene282 ftJun 1Jun 18Sep 8Aug 2194 days
Kenai 9N126 ftMay 18May 30Sep 22Sep 6125 days
Kenai Muni AP91 ftMay 24Jun 4Sep 12Aug 29110 days
Ketchikan 10N295 ftApr 20May 4Oct 26Oct 10189 days
Ketchikan Intl AP76 ftApr 22May 9Oct 23Oct 3185 days
Keystone Ridge1,600 ftMay 15May 31Sep 16Aug 30122 days
King Salmon63 ftMay 26Jun 11Sep 15Aug 31111 days
King Salmon 42 Se661 ftJun 9Jun 22Sep 11Aug 2693 days
Kitoi Bay60 ftMay 11May 28Oct 6Sep 25149 days
Kivalina AP10 ftJun 10Jun 23Sep 11Aug 2692 days
Klawock AP12 ftApr 29May 14Oct 16Oct 1169 days
Kobe Hill800 ftMay 24Jun 10Sep 2Aug 17100 days
Kodiak AP80 ftMay 5May 21Oct 3Sep 22151 days
Kodiak Wwtp54 ftApr 29May 13Oct 14Sep 30168 days
Kotzebue Ralph Wein AP30 ftJun 5Jun 17Sep 24Sep 7110 days
Lake Susitna2,375 ftMay 30Jun 9Sep 4Aug 1795 days
Lazy Mtn733 ftMay 22Jun 3Sep 16Sep 1114 days
Little Port Walter14 ftApr 21May 9Oct 31Oct 5190 days
Little Su At Hatcher Pass Brg902 ftMay 18May 30Sep 18Sep 2122 days
Main Bay57 ftMay 19Jun 4Oct 6Sep 24139 days
Matanuska Exp Farm172 ftMay 14May 26Sep 20Sep 6127 days
Mcgrath AP333 ftMay 13May 28Sep 13Aug 27120 days
Mckinley Park2,070 ftJun 6Jun 30Aug 25Aug 977 days
Metlakatla 6 S105 ftApr 14May 1Oct 25Oct 8192 days
Mile 42 Steese960 ftMay 28Jun 19Aug 26Aug 987 days
Minchumina1,025 ftMay 13May 28Sep 17Sep 3124 days
Monashka Creek Dam130 ftMay 27Jun 10Sep 23Sep 5117 days
Moose Pass 3NW492 ftMay 31Jun 15Sep 8Aug 2499 days
N Pole475 ftMay 18May 31Sep 5Aug 24110 days
N Pole 1N496 ftMay 22Jun 4Sep 2Aug 20102 days
Nabesna2,920 ftJun 4Jul 3Sep 1Aug 1985 days
Nenana Muni AP360 ftMay 15May 29Sep 11Aug 27117 days
Nome Muni AP13 ftJun 5Jun 26Sep 3Aug 1588 days
Northway AP1,713 ftMay 26Jun 8Sep 1Aug 1897 days
Ouzinkie40 ftMay 9May 23Oct 4Sep 22148 days
Palmer Job Corps216 ftApr 24May 9Oct 4Sep 22164 days
Palmer Muni AP230 ftMay 6May 18Sep 25Sep 11140 days
Pelican12 ftMay 4May 18Oct 19Oct 4167 days
Petersburg 1107 ftApr 29May 14Oct 17Sep 30169 days
Port Alcan1,892 ftMay 28Jun 10Aug 29Aug 1491 days
Port Alexander12 ftApr 18May 5Nov 5Oct 16198 days
Port Alsworth260 ftMay 12May 27Sep 24Sep 8134 days
Port Alsworth 1 Sw321 ftJun 2Jun 13Sep 12Aug 29101 days
Port San Juan40 ftMay 10May 28Oct 7Sep 22150 days
Portage Glacier V C103 ftMay 27Jun 11Sep 12Aug 24106 days
Pt Baker20 ftApr 19May 5Oct 25Oct 5187 days
Puntilla1,858 ftJun 7Jun 30Sep 2Aug 1483 days
Ruby 44 Ese259 ftMay 22Jun 3Sep 3Aug 21101 days
Sand Point 1 Ene240 ftMay 11May 25Oct 18Oct 4160 days
Seldovia AP29 ftMay 10May 24Oct 1Sep 17145 days
Seward 19N518 ftMay 21May 31Sep 26Sep 13127 days
Seward AP22 ftMay 2May 17Oct 7Sep 28158 days
Silver Lake1,200 ftMay 31Jun 10Sep 3Aug 2095 days
Sitka 1 Ne78 ftMay 3May 19Oct 18Oct 1166 days
Sitka Airport14 ftApr 12Apr 30Nov 1Oct 13201 days
Skagway35 ftMay 6May 22Oct 1Sep 15146 days
Skagway AP20 ftApr 21May 2Oct 17Oct 1176 days
Skwentna150 ftMay 23Jun 4Sep 9Aug 26109 days
Snettisham Pwr Plt29 ftMay 5May 22Oct 15Sep 30162 days
Soldotna 5SSW180 ftJun 11Jul 7Sep 1Aug 1175 days
St George Island AP125 ftMay 31Jun 23Oct 5Sep 17128 days
St Paul Island AP35 ftJun 4Jun 25Sep 28Sep 11114 days
St. Paul 4 Ne20 ftJun 5Jul 1Sep 28Sep 3110 days
Sterling 6SW292 ftMay 20Jun 1Sep 21Sep 6123 days
Sutton 1 W550 ftJun 1Jun 13Sep 6Aug 2498 days
Talkeetna AP350 ftMay 16May 28Sep 16Sep 1122 days
Tanana Calhoun Mem AP227 ftMay 29Jun 16Aug 28Aug 1089 days
Thorne Bay286 ftMay 1May 16Oct 13Oct 1166 days
Tok #21,658 ftJun 3Jul 13Aug 27Aug 1179 days
Two Rivers605 ftMay 30Jun 13Sep 2Aug 1395 days
University Exp Stn475 ftMay 16May 30Sep 8Aug 26114 days
Valdez62 ftMay 14May 26Sep 22Sep 6129 days
Valdez WSO95 ftApr 30May 10Oct 2Sep 20157 days
Wally Noerenberg Hatchery35 ftMay 20Jun 1Oct 9Sep 26142 days
Whites Crossing270 ftMay 29Jun 9Sep 7Aug 24100 days
Whitestone Farms995 ftMay 26Jun 9Sep 2Aug 1998 days
Whittier60 ftApr 25May 8Oct 14Oct 1172 days
Willow West205 ftMay 15May 28Sep 18Sep 4126 days
Wrangell AP56 ftApr 11Apr 29Nov 1Oct 13202 days
Yakutat 3 Sse26 ftMay 13May 29Sep 26Sep 13133 days
Yakutat State AP33 ftMay 20May 31Sep 23Sep 5124 days
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