Alaska Frost Dates

Alaska has 172 NOAA weather stations with freeze records in the 1991–2020 climate normals. The typical last spring frost ranges from April 4 at Annette Island Ap to June 12 at Cooper Landing 5 W; at half the stations it has come by May 18. The first fall frost typically arrives between August 21 at Delta Junction 20 Se and November 9 at Beaver Falls, with a median of September 22.

The growing season between the typical frosts runs from 73 days at Gulkana Ap to 218 days at Beaver Falls; 124 days at the median station.

At 26 stations, a freeze is possible in any month.

Every station in Alaska

Typical dates have a 50% chance of a frost after them in spring, and before them in fall; safer dates, 10%. A garden can differ from its nearest station, especially in a valley or on a hillside: see why your garden may differ.

Alaska: freeze (32 °F) dates by NOAA station, 1991–2020 normals
Station	Elevation	Last frost	Safer	First frost	Safer	Season (days)
Alpine	17 ft	A freeze is possible in any month
Alyeska	272 ft	May 8	May 22	Sep 29	Sep 14	142
Amber Lake	449 ft	May 28	Jun 9	Sep 13	Aug 30	107
Anchorage Forecast Office	131 ft	May 5	May 14	Sep 29	Sep 17	147
Anchorage Intl Ap	120 ft	May 5	May 15	Oct 1	Sep 18	147
Anchorage Lake Hood Ap	90 ft	May 1	May 8	Oct 3	Sep 22	156
Anchorage Merrill Fld	138 ft	May 1	May 9	Sep 29	Sep 17	150
Anchorage Rabbit Creek #2	913 ft	May 12	May 24	Sep 26	Sep 12	137
Anchorage Upper De Armoun	1,335 ft	May 7	May 23	Sep 28	Sep 16	143
Anderson Lake	458 ft	May 16	May 31	Sep 23	Sep 8	128
Annette Island Ap	109 ft	Apr 4	Apr 22	Oct 31	Oct 15	208
Annex Creek	92 ft	May 3	May 18	Oct 14	Oct 1	164
Aurora	443 ft	May 16	May 29	Sep 6	Aug 25	112
Barrow Post Rogers Ap	31 ft	A freeze is possible in any month
Beaver Falls	35 ft	Apr 4	Apr 25	Nov 9	Oct 19	218
Bethel Ap	102 ft	May 21	Jun 2	Sep 22	Sep 7	122
Bettles Ap	642 ft	May 22	Jun 5	Aug 24	Aug 10	94
Big Delta Ap	1,277 ft	May 17	May 31	Sep 7	Aug 23	113
Big River Lakes	60 ft	May 7	May 25	Oct 7	Sep 20	151
Campbell Creek Sci Ctr	258 ft	May 28	Jun 6	Sep 12	Aug 30	107
Cannery Creek	85 ft	May 16	May 29	Oct 3	Sep 21	139
Cantwell 2 E	2,132 ft	A freeze is possible in any month
Central #2	920 ft	May 25	Jun 6	Aug 26	Aug 12	92
Chandalar Lake	1,895 ft	A freeze is possible in any month
Chandalar Shelf Dot	3,250 ft	A freeze is possible in any month
Chicken	1,800 ft	A freeze is possible in any month
Chulitna Rvr	1,354 ft	A freeze is possible in any month
Circle Hot Springs	860 ft	A freeze is possible in any month
Clear Sky	646 ft	May 24	Jun 12	Sep 4	Aug 19	100
Cold Bay Ap	78 ft	May 25	Jun 10	Oct 4	Sep 20	131
College 5 Nw	978 ft	May 13	May 31	Sep 15	Aug 29	122
College Obsy	597 ft	May 18	Jun 1	Sep 6	Aug 24	111
Colville Village	5 ft	A freeze is possible in any month
Cooper Lake Project	505 ft	May 18	May 31	Sep 27	Sep 12	130
Cooper Landing 5 W	375 ft	Jun 12	Jul 2	Sep 1	Aug 14	78
Cordova M K Smith Ap	31 ft	May 23	Jun 5	Sep 19	Sep 5	118
Cordova N	25 ft	Apr 24	May 8	Oct 19	Oct 4	176
Cordova Wwtp	10 ft	Apr 29	May 13	Oct 13	Sep 25	169
Craig	43 ft	Apr 14	May 2	Nov 1	Oct 16	201
Deadhorse Ap	61 ft	A freeze is possible in any month
Deering Ap	21 ft	A freeze is possible in any month
Delta 5 Ne	1,060 ft	Jun 4	Jul 17	Aug 22	Aug 7	75
Delta 6 N	1,059 ft	A freeze is possible in any month
Delta Junction 20 Se	1,125 ft	Jun 5	Jun 30	Aug 21	Aug 8	75
Denali 27 N	2,225 ft	May 25	Jun 3	Sep 8	Aug 26	105
Dry Creek	1,355 ft	May 30	Jun 13	Aug 24	Aug 9	84
Dutch Harbor	10 ft	May 6	May 22	Oct 18	Sep 20	164
Eagle Ap	908 ft	A freeze is possible in any month
Eagle Rvr 5 Se	498 ft	May 21	Jun 3	Sep 15	Aug 31	116
Eagle Rvr Gakona Circle	567 ft	May 9	May 22	Sep 26	Sep 12	139
Eagle Rvr Nature Ctr	520 ft	May 16	Jun 9	Sep 20	Sep 4	125
Eagle	850 ft	May 29	Jun 11	Aug 23	Aug 8	86
Eaglecrest Base	1,134 ft	May 21	Jun 2	Oct 1	Sep 19	132
Eielson Fld	547 ft	May 20	Jun 3	Sep 1	Aug 20	104
Eklutna Wtp	640 ft	May 18	May 30	Sep 20	Sep 4	124
Elfin Cove	20 ft	Apr 26	May 8	Nov 1	Oct 15	188
Ester 5ne	630 ft	A freeze is possible in any month
Ester	655 ft	May 24	Jun 4	Sep 1	Aug 19	98
Fairbanks Midtown	440 ft	May 13	May 28	Sep 10	Aug 28	119
Farewell Lake	1,060 ft	May 30	Jun 15	Sep 5	Aug 22	97
Ft Knox Mine	1,621 ft	May 12	May 28	Sep 17	Aug 29	126
Ft Richardson Wtp	470 ft	May 9	May 22	Sep 26	Sep 9	138
Galena	152 ft	May 18	Jun 1	Sep 8	Aug 24	111
Gennallen Kcam	1,383 ft	A freeze is possible in any month
Glacier Bay	45 ft	May 6	May 26	Oct 10	Sep 19	154
Glen Alps	2,202 ft	May 18	May 31	Sep 23	Sep 8	125
Gulkana Ap	1,562 ft	Jun 7	Jul 5	Aug 21	Aug 8	73
Gustavus 2 Ne	20 ft	May 28	Jun 12	Sep 25	Aug 29	116
Gustavus	40 ft	May 30	Jun 22	Sep 16	Aug 29	107
Haines #2	95 ft	Apr 30	May 13	Oct 7	Sep 24	160
Haines Ap	15 ft	Apr 25	May 7	Oct 12	Sep 30	172
Hayes River	1,000 ft	Jun 2	Jun 11	Sep 8	Aug 23	98
Healy	1,417 ft	May 27	Jun 10	Sep 1	Aug 18	97
Hidden Falls Hatchery	22 ft	Apr 29	May 15	Oct 25	Oct 7	176
Homer 8 Nw	1,080 ft	May 16	May 30	Sep 30	Sep 16	136
Homer 9 E	512 ft	May 27	Jun 8	Sep 22	Sep 4	116
Homer Ap	64 ft	May 10	May 23	Sep 29	Sep 14	141
Hoonah	130 ft	May 9	Jul 4	Oct 4	Sep 1	145
Hope	180 ft	May 18	May 28	Sep 24	Sep 12	127
Hyder	80 ft	May 4	May 23	Oct 11	Oct 1	157
Iliamna Ap	143 ft	May 10	May 25	Oct 1	Sep 17	144
Intricate Bay	120 ft	Jun 4	Jun 22	Sep 12	Aug 28	98
Juneau Dwtn	50 ft	Apr 20	May 5	Oct 22	Oct 5	183
Juneau Intl Ap	16 ft	May 4	May 18	Oct 3	Sep 18	150
Kaltag Ap	181 ft	May 25	Jun 11	Sep 3	Aug 18	101
Kenai 29 Ene	282 ft	Jun 1	Jun 18	Sep 8	Aug 21	94
Kenai 9n	126 ft	May 18	May 30	Sep 22	Sep 6	125
Kenai Muni Ap	91 ft	May 24	Jun 4	Sep 12	Aug 29	110
Ketchikan 10n	295 ft	Apr 20	May 4	Oct 26	Oct 10	189
Ketchikan Intl Ap	76 ft	Apr 22	May 9	Oct 23	Oct 3	185
Keystone Ridge	1,600 ft	May 15	May 31	Sep 16	Aug 30	122
King Salmon 42 Se	661 ft	Jun 9	Jun 22	Sep 11	Aug 26	93
King Salmon	63 ft	May 26	Jun 11	Sep 15	Aug 31	111
Kivalina Ap	10 ft	Jun 10	Jun 23	Sep 11	Aug 26	92
Klawock Ap	12 ft	Apr 29	May 14	Oct 16	Oct 1	169
Kobe Hill	800 ft	May 24	Jun 10	Sep 2	Aug 17	100
Kodiak Ap	80 ft	May 5	May 21	Oct 3	Sep 22	151
Kodiak Wwtp	54 ft	Apr 29	May 13	Oct 14	Sep 30	168
Kotzebue Ralph Wein Ap	30 ft	Jun 5	Jun 17	Sep 24	Sep 7	110
Kuparuk	64 ft	A freeze is possible in any month
Lake Susitna	2,375 ft	May 30	Jun 9	Sep 4	Aug 17	95
Lazy Mtn	733 ft	May 22	Jun 3	Sep 16	Sep 1	114
Little Port Walter	14 ft	Apr 21	May 9	Oct 31	Oct 5	190
Little Su At Hatcher Pass Brg	902 ft	May 18	May 30	Sep 18	Sep 2	122
Manley Hot Springs 15ne	501 ft	A freeze is possible in any month
Mccarthy 3 Sw	1,250 ft	A freeze is possible in any month
Mcgrath Ap	333 ft	May 13	May 28	Sep 13	Aug 27	120
Mckinley Park	2,070 ft	Jun 6	Jun 30	Aug 25	Aug 9	77
Metlakatla 6 S	105 ft	Apr 14	May 1	Oct 25	Oct 8	192
Mile 42 Steese	960 ft	May 28	Jun 19	Aug 26	Aug 9	87
Minchumina	1,025 ft	May 13	May 28	Sep 17	Sep 3	124
Monashka Creek Dam	130 ft	May 27	Jun 10	Sep 23	Sep 5	117
Moose Pass 3nw	492 ft	May 31	Jun 15	Sep 8	Aug 24	99
N Pole 1n	496 ft	May 22	Jun 4	Sep 2	Aug 20	102
N Pole	475 ft	May 18	May 31	Sep 5	Aug 24	110
Nabesna	2,920 ft	Jun 4	Jul 3	Sep 1	Aug 19	85
Nenana Muni Ap	360 ft	May 15	May 29	Sep 11	Aug 27	117
Nome Muni Ap	13 ft	Jun 5	Jun 26	Sep 3	Aug 15	88
Northway Ap	1,713 ft	May 26	Jun 8	Sep 1	Aug 18	97
Nuiqsut Ap	57 ft	A freeze is possible in any month
Ouzinkie	40 ft	May 9	May 23	Oct 4	Sep 22	148
Palmer Job Corps	216 ft	Apr 24	May 9	Oct 4	Sep 22	164
Palmer Muni Ap	230 ft	May 6	May 18	Sep 25	Sep 11	140
Pelican	12 ft	May 4	May 18	Oct 19	Oct 4	167
Petersburg 1	107 ft	Apr 29	May 14	Oct 17	Sep 30	169
Port Alcan	1,892 ft	May 28	Jun 10	Aug 29	Aug 14	91
Port Alexander	12 ft	Apr 18	May 5	Nov 5	Oct 16	198
Port Alsworth 1 Sw	321 ft	Jun 2	Jun 13	Sep 12	Aug 29	101
Port Alsworth	260 ft	May 12	May 27	Sep 24	Sep 8	134
Portage Glacier V C	103 ft	May 27	Jun 11	Sep 12	Aug 24	106
Pt Baker	20 ft	Apr 19	May 5	Oct 25	Oct 5	187
Puntilla	1,858 ft	Jun 7	Jun 30	Sep 2	Aug 14	83
Ruby 44 Ese	259 ft	May 22	Jun 3	Sep 3	Aug 21	101
Sand Point 1 Ene	240 ft	May 11	May 25	Oct 18	Oct 4	160
Seldovia Ap	29 ft	May 10	May 24	Oct 1	Sep 17	145
Seward 19n	518 ft	May 21	May 31	Sep 26	Sep 13	127
Seward 8 Nw	424 ft	A freeze is possible in any month
Seward Ap	22 ft	May 2	May 17	Oct 7	Sep 28	158
Silver Lake	1,200 ft	May 31	Jun 10	Sep 3	Aug 20	95
Sitka 1 Ne	78 ft	May 3	May 19	Oct 18	Oct 1	166
Sitka Airport	14 ft	Apr 12	Apr 30	Nov 1	Oct 13	201
Skagway Ap	20 ft	Apr 21	May 2	Oct 17	Oct 1	176
Skagway	35 ft	May 6	May 22	Oct 1	Sep 15	146
Skwentna	150 ft	May 23	Jun 4	Sep 9	Aug 26	109
Soldotna 5ssw	180 ft	Jun 11	Jul 7	Sep 1	Aug 11	75
St George Island Ap	125 ft	May 31	Jun 23	Oct 5	Sep 17	128
St Paul Island Ap	35 ft	Jun 4	Jun 25	Sep 28	Sep 11	114
St. Paul 4 Ne	20 ft	Jun 5	Jul 1	Sep 28	Sep 3	110
Sterling 6sw	292 ft	May 20	Jun 1	Sep 21	Sep 6	123
Sutton 1 W	550 ft	Jun 1	Jun 13	Sep 6	Aug 24	98
Talkeetna Ap	350 ft	May 16	May 28	Sep 16	Sep 1	122
Tanana Calhoun Mem Ap	227 ft	May 29	Jun 16	Aug 28	Aug 10	89
Thorne Bay	286 ft	May 1	May 16	Oct 13	Oct 1	166
Tok #2	1,658 ft	Jun 3	Jul 13	Aug 27	Aug 11	79
Tok 70 Se	2,000 ft	A freeze is possible in any month
Tok	1,625 ft	A freeze is possible in any month
Tonsina	1,579 ft	A freeze is possible in any month
Two Rivers	605 ft	May 30	Jun 13	Sep 2	Aug 13	95
University Exp Stn	475 ft	May 16	May 30	Sep 8	Aug 26	114
Utqiagvik Formerly Barrow 4 En	15 ft	A freeze is possible in any month
Valdez Wso	95 ft	Apr 30	May 10	Oct 2	Sep 20	157
Valdez	62 ft	May 14	May 26	Sep 22	Sep 6	129
Wainwright Ap	30 ft	A freeze is possible in any month
Wally Noerenberg Hatchery	35 ft	May 20	Jun 1	Oct 9	Sep 26	142
Whites Crossing	270 ft	May 29	Jun 9	Sep 7	Aug 24	100
Whitestone Farms	995 ft	May 26	Jun 9	Sep 2	Aug 19	98
Whittier	60 ft	Apr 25	May 8	Oct 14	Oct 1	172
Willow West	205 ft	May 15	May 28	Sep 18	Sep 4	126
Wiseman	1,181 ft	A freeze is possible in any month
Wrangell Ap	56 ft	Apr 11	Apr 29	Nov 1	Oct 13	202
Yakutat 3 Sse	26 ft	May 13	May 29	Sep 26	Sep 13	133
Yakutat State Ap	33 ft	May 20	May 31	Sep 23	Sep 5	124

Plan your garden with these dates

Enter your ZIP code in the planner: it picks the nearest of these stations and dates every crop in your beds from its frosts. Free, in your browser.

Open the garden planner Planting calendar

Questions

When is the last frost in Alaska?

It depends on where you are. The typical last spring frost at Alaska's NOAA stations ranges from April 4 to June 12, and half of them have had it by May 18. Enter your ZIP code above for the station nearest you.

When is the first frost in Alaska?

Typically between August 21 and November 9, depending on the station; the median is September 22. Plan fall crops back from your own station's date.

What do "typical" and "safer" mean?

With the typical (50%) last-frost date, half of years still have a frost after it. With the safer (10%) date, only one year in ten does. In fall it's the other way around: the safer date is the earlier one.

Sources

NOAA National Centers for Environmental Information, U.S. Climate Normals 1991–2020 (annual/seasonal, by station: freeze dates at 32 °F)

Alaska Frost Dates

Every station in Alaska

Plan your garden with these dates

Questions

Other states

Sources