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Alaska frost dates by weather station

Alaska has 192 NOAA weather stations with 1991–2020 freeze statistics. Median last spring frost dates run from Apr 4 at Annette Island Airport to Jun 12 at Cooper Landing 5 W.

192Stations
Apr 4Earliest last frostAnnette Island Airport
Jun 12Latest last frostCooper Landing 5 W
218 daysLongest growing seasonBeaver Falls

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Alaska stations: median (50%) frost dates at 32°F
Station	Last spring frost	First fall frost	Growing season	Elevation
Alpine	any month	any month	53 days	17 ft
Alyeska	May 8	Sep 29	142 days	272 ft
Amber Lake	May 28	Sep 13	107 days	449 ft
Anchorage Forecast Office	May 5	Sep 29	147 days	131 ft
Anchorage Intl Airport	May 5	Oct 1	147 days	120 ft
Anchorage Lake Hood Airport	May 1	Oct 3	156 days	90 ft
Anchorage Merrill Field	May 1	Sep 29	150 days	138 ft
Anchorage Rabbit Creek #2	May 12	Sep 26	137 days	913 ft
Anchorage Upper De Armoun	May 7	Sep 28	143 days	1,335 ft
Anderson Lake	May 16	Sep 23	128 days	458 ft
Annette Island Airport	Apr 4	Oct 31	208 days	109 ft
Annex Creek	May 3	Oct 14	164 days	92 ft
Auke Bay	Apr 27	Oct 18	172 days	44 ft
Aurora	May 16	Sep 6	112 days	443 ft
Barrow Post Rogers Airport	any month	any month	26 days	31 ft
Beaver Falls	Apr 4	Nov 9	218 days	35 ft
Ben's Farm	May 12	Sep 20	129 days	127 ft
Bethel Airport	May 21	Sep 22	122 days	102 ft
Bettles Airport	May 22	Aug 24	94 days	642 ft
Big Delta Airport	May 17	Sep 7	113 days	1,277 ft
Big River Lakes	May 7	Oct 7	151 days	60 ft
Campbell Creek Sci Center	May 28	Sep 12	107 days	258 ft
Cannery Creek	May 16	Oct 3	139 days	85 ft
Cantwell 2 E	any month	any month	45 days	2,132 ft
Central #2	May 25	Aug 26	92 days	920 ft
Chandalar Lake	any month	any month	66 days	1,895 ft
Chandalar Shelf Dot	any month	any month	69 days	3,250 ft
Chicken	any month	any month	42 days	1,800 ft
Chulitna River	any month	any month	49 days	1,354 ft
Circle Hot Springs	any month	any month	58 days	860 ft
Clear Sky	May 24	Sep 4	100 days	646 ft
Cold Bay Airport	May 25	Oct 4	131 days	78 ft
College 5 NW	May 13	Sep 15	122 days	978 ft
College Obsy	May 18	Sep 6	111 days	597 ft
Colville Village	any month	any month	48 days	5 ft
Cooper Lake Project	May 18	Sep 27	130 days	505 ft
Cooper Landing 5 W	Jun 12	Sep 1	78 days	375 ft
Cordova M K Smith Airport	May 23	Sep 19	118 days	31 ft
Cordova N	Apr 24	Oct 19	176 days	25 ft
Cordova Wastewater Plant	Apr 29	Oct 13	169 days	10 ft
Craig	Apr 14	Nov 1	201 days	43 ft
Deadhorse Airport	any month	any month	47 days	61 ft
Deering Airport	any month	any month	76 days	21 ft
Delta 5 NE	Jun 4	Aug 22	75 days	1,060 ft
Delta 6 N	any month	any month	63 days	1,059 ft
Delta Junction 20 SE	Jun 5	Aug 21	75 days	1,125 ft
Denali 27 N	May 25	Sep 8	105 days	2,225 ft
Dry Creek	May 30	Aug 24	84 days	1,355 ft
Dutch Harbor	May 6	Oct 18	164 days	10 ft
Eagle	May 29	Aug 23	86 days	850 ft
Eagle Airport	any month	any month	61 days	908 ft
Eagle River 5 SE	May 21	Sep 15	116 days	498 ft
Eagle River Gakona Circle	May 9	Sep 26	139 days	567 ft
Eagle River Nature Center	May 16	Sep 20	125 days	520 ft
Eaglecrest Base	May 21	Oct 1	132 days	1,134 ft
Eielson Field	May 20	Sep 1	104 days	547 ft
Eklutna Water Plant	May 18	Sep 20	124 days	640 ft
Elfin Cove	Apr 26	Nov 1	188 days	20 ft
Ester	May 24	Sep 1	98 days	655 ft
Ester 5ne	any month	any month	65 days	630 ft
Fairbanks 11 NE	May 12	Sep 16	124 days	1,140 ft
Fairbanks Airport #2	May 16	Sep 8	113 days	427 ft
Fairbanks Intl Airport	May 13	Sep 13	121 days	432 ft
Fairbanks Midtown	May 13	Sep 10	119 days	440 ft
Farewell Lake	May 30	Sep 5	97 days	1,060 ft
Fort Knox Mine	May 12	Sep 17	126 days	1,621 ft
Fort Richardson Water Plant	May 9	Sep 26	138 days	470 ft
Fox 2 SE	May 28	Sep 1	96 days	775 ft
Galena	May 18	Sep 8	111 days	152 ft
Gennallen Kcam	any month	any month	61 days	1,383 ft
Gilmore Creek	Jun 1	Aug 28	87 days	945 ft
Glacier Bay	May 6	Oct 10	154 days	45 ft
Glen Alps	May 18	Sep 23	125 days	2,202 ft
Glennallen 64 N	Jun 5	Aug 24	76 days	2,669 ft
Goldstream Creek	any month	any month	75 days	577 ft
Gulkana Airport	Jun 7	Aug 21	73 days	1,562 ft
Gustavus	May 30	Sep 16	107 days	40 ft
Gustavus 2 NE	May 28	Sep 25	116 days	20 ft
Haines #2	Apr 30	Oct 7	160 days	95 ft
Haines 40nw	May 24	Sep 20	118 days	820 ft
Haines Airport	Apr 25	Oct 12	172 days	15 ft
Hayes River	Jun 2	Sep 8	98 days	1,000 ft
Healy	May 27	Sep 1	97 days	1,417 ft
Hidden Falls Hatchery	Apr 29	Oct 25	176 days	22 ft
Homer 8 NW	May 16	Sep 30	136 days	1,080 ft
Homer 9 E	May 27	Sep 22	116 days	512 ft
Homer Airport	May 10	Sep 29	141 days	64 ft
Hoonah	May 9	Oct 4	145 days	130 ft
Hope	May 18	Sep 24	127 days	180 ft
Hyder	May 4	Oct 11	157 days	80 ft
Iliamna Airport	May 10	Oct 1	144 days	143 ft
Intricate Bay	Jun 4	Sep 12	98 days	120 ft
Juneau Dwtn	Apr 20	Oct 22	183 days	50 ft
Juneau Forecast Office	May 9	Oct 4	146 days	106 ft
Juneau Intl Airport	May 4	Oct 3	150 days	16 ft
Juneau Lena Point	Apr 11	Nov 1	202 days	35 ft
Juneau Mile 17	Apr 29	Oct 20	173 days	245 ft
Kaltag Airport	May 25	Sep 3	101 days	181 ft
Kenai 29 ENE	Jun 1	Sep 8	94 days	282 ft
Kenai 9n	May 18	Sep 22	125 days	126 ft
Kenai Muni Airport	May 24	Sep 12	110 days	91 ft
Ketchikan 10n	Apr 20	Oct 26	189 days	295 ft
Ketchikan Intl Airport	Apr 22	Oct 23	185 days	76 ft
Keystone Ridge	May 15	Sep 16	122 days	1,600 ft
King Salmon	May 26	Sep 15	111 days	63 ft
King Salmon 42 SE	Jun 9	Sep 11	93 days	661 ft
Kitoi Bay	May 11	Oct 6	149 days	60 ft
Kivalina Airport	Jun 10	Sep 11	92 days	10 ft
Klawock Airport	Apr 29	Oct 16	169 days	12 ft
Kobe Hill	May 24	Sep 2	100 days	800 ft
Kodiak Airport	May 5	Oct 3	151 days	80 ft
Kodiak Wastewater Plant	Apr 29	Oct 14	168 days	54 ft
Kotzebue Ralph Wein Airport	Jun 5	Sep 24	110 days	30 ft
Kuparuk	any month	any month	38 days	64 ft
Lake Susitna	May 30	Sep 4	95 days	2,375 ft
Lazy Mountain	May 22	Sep 16	114 days	733 ft
Little Port Walter	Apr 21	Oct 31	190 days	14 ft
Little Su At Hatcher Pass Brg	May 18	Sep 18	122 days	902 ft
Main Bay	May 19	Oct 6	139 days	57 ft
Manley Hot Springs 15ne	any month	any month	80 days	501 ft
Matanuska Exp. Farm	May 14	Sep 20	127 days	172 ft
McCarthy 3 SW	any month	any month	63 days	1,250 ft
McGrath Airport	May 13	Sep 13	120 days	333 ft
McKinley Park	Jun 6	Aug 25	77 days	2,070 ft
Metlakatla 6 S	Apr 14	Oct 25	192 days	105 ft
Mile 42 Steese	May 28	Aug 26	87 days	960 ft
Minchumina	May 13	Sep 17	124 days	1,025 ft
Monashka Creek Dam	May 27	Sep 23	117 days	130 ft
Moose Pass 3nw	May 31	Sep 8	99 days	492 ft
N Pole	May 18	Sep 5	110 days	475 ft
N Pole 1n	May 22	Sep 2	102 days	496 ft
Nabesna	Jun 4	Sep 1	85 days	2,920 ft
Nenana Muni Airport	May 15	Sep 11	117 days	360 ft
Nome Muni Airport	Jun 5	Sep 3	88 days	13 ft
Northway Airport	May 26	Sep 1	97 days	1,713 ft
Nuiqsut Airport	any month	any month	51 days	57 ft
Ouzinkie	May 9	Oct 4	148 days	40 ft
Palmer Job Corps	Apr 24	Oct 4	164 days	216 ft
Palmer Muni Airport	May 6	Sep 25	140 days	230 ft
Paxson	any month	any month	60 days	2,700 ft
Pelican	May 4	Oct 19	167 days	12 ft
Petersburg 1	Apr 29	Oct 17	169 days	107 ft
Point Baker	Apr 19	Oct 25	187 days	20 ft
Port Alcan	May 28	Aug 29	91 days	1,892 ft
Port Alexander	Apr 18	Nov 5	198 days	12 ft
Port Alsworth	May 12	Sep 24	134 days	260 ft
Port Alsworth 1 SW	Jun 2	Sep 12	101 days	321 ft
Port San Juan	May 10	Oct 7	150 days	40 ft
Portage Glacier V C	May 27	Sep 12	106 days	103 ft
Puntilla	Jun 7	Sep 2	83 days	1,858 ft
Ruby 44 ESE	May 22	Sep 3	101 days	259 ft
Sand Point 1 ENE	May 11	Oct 18	160 days	240 ft
Seldovia Airport	May 10	Oct 1	145 days	29 ft
Seward 19n	May 21	Sep 26	127 days	518 ft
Seward 8 NW	any month	any month	67 days	424 ft
Seward Airport	May 2	Oct 7	158 days	22 ft
Silver Lake	May 31	Sep 3	95 days	1,200 ft
Sitka 1 NE	May 3	Oct 18	166 days	78 ft
Sitka Airport	Apr 12	Nov 1	201 days	14 ft
Skagway	May 6	Oct 1	146 days	35 ft
Skagway Airport	Apr 21	Oct 17	176 days	20 ft
Skwentna	May 23	Sep 9	109 days	150 ft
Snettisham Power Plant	May 5	Oct 15	162 days	29 ft
Soldotna 5ssw	Jun 11	Sep 1	75 days	180 ft
St. George Island Airport	May 31	Oct 5	128 days	125 ft
St. Paul 4 NE	Jun 5	Sep 28	110 days	20 ft
St. Paul Island Airport	Jun 4	Sep 28	114 days	35 ft
Sterling 6sw	May 20	Sep 21	123 days	292 ft
Sutton 1 W	Jun 1	Sep 6	98 days	550 ft
Talkeetna Airport	May 16	Sep 16	122 days	350 ft
Tanana Calhoun Mem Airport	May 29	Aug 28	89 days	227 ft
Thorne Bay	May 1	Oct 13	166 days	286 ft
Tok	any month	any month	64 days	1,625 ft
Tok #2	Jun 3	Aug 27	79 days	1,658 ft
Tok 70 SE	any month	any month	53 days	2,000 ft
Tonsina	any month	any month	72 days	1,579 ft
Toolik Lake 5 ENE	any month	any month	47 days	2,461 ft
Two Rivers	May 30	Sep 2	95 days	605 ft
University Exp. Station	May 16	Sep 8	114 days	475 ft
Utqiagvik Formerly Barrow 4 En	any month	any month	21 days	15 ft
Valdez	May 14	Sep 22	129 days	62 ft
Valdez WSO	Apr 30	Oct 2	157 days	95 ft
Wainwright Airport	any month	any month	43 days	30 ft
Wally Noerenberg Hatchery	May 20	Oct 9	142 days	35 ft
Whites Crossing	May 29	Sep 7	100 days	270 ft
Whitestone Farms	May 26	Sep 2	98 days	995 ft
Whittier	Apr 25	Oct 14	172 days	60 ft
Willow West	May 15	Sep 18	126 days	205 ft
Wiseman	any month	any month	76 days	1,181 ft
Wrangell Airport	Apr 11	Nov 1	202 days	56 ft
Yakutat 3 SSE	May 13	Sep 26	133 days	26 ft
Yakutat State Airport	May 20	Sep 23	124 days	33 ft

Sources

NOAA National Centers for Environmental Information, U.S. Climate Normals 1991–2020, annual/seasonal normals by station (version 1.0.1), file dated June 27, 2023; documentation.

Freeze dates are 30-year probabilities, not forecasts. Check your local forecast before planting tender plants.