Frost Dates in Alaska
Across 163 NOAA weather stations in Alaska, the average last spring frost falls between April 4 at Annette Island Airport and June 12 at Cooper Landing 5 W. At a typical Alaska station it is around May 16, with the first fall frost around September 22 and a frost-free season of about 124 days.
Find the frost dates for your ZIP code
A typical Alaska season
What shapes frost dates in Alaska
- The frost-free season ranges from 73 days at Gulkana Airport to 218 days at Beaver Falls.
- Elevation matters: Nabesna, at 2,920 ft, averages its last frost on June 4, while Cordova Wwtp, at 10 ft, averages April 29.
- Gardens in valleys and low spots, where cold air settles, often frost a week or more later in spring than the nearest station.
Frost dates at major airports
| Station | Last frost | Safer date | First frost | Season (days) |
|---|---|---|---|---|
| Anchorage Intl Airport | May 5 | May 15 | Oct 1 | 147 |
| Anchorage Lake Hood Airport | May 1 | May 8 | Oct 3 | 156 |
| Anchorage Merrill Fld | May 1 | May 9 | Sep 29 | 150 |
| Annette Island Airport | Apr 4 | Apr 22 | Oct 31 | 208 |
| Bethel Airport | May 21 | Jun 2 | Sep 22 | 122 |
| Bettles Airport | May 22 | Jun 5 | Aug 24 | 94 |
| Big Delta Airport | May 17 | May 31 | Sep 7 | 113 |
| Cold Bay Airport | May 25 | Jun 10 | Oct 4 | 131 |
| Cordova M K Smith Airport | May 23 | Jun 5 | Sep 19 | 118 |
| Denali 27 N | May 25 | Jun 3 | Sep 8 | 105 |
| Fairbanks 11 NE | May 12 | May 29 | Sep 16 | 124 |
| Fairbanks Intl Airport | May 13 | May 26 | Sep 13 | 121 |
| Glennallen 64 N | Jun 5 | Jun 21 | Aug 24 | 76 |
| Gulkana Airport | Jun 7 | Jul 5 | Aug 21 | 73 |
| Gustavus | May 30 | Jun 22 | Sep 16 | 107 |
| Gustavus 2 NE | May 28 | Jun 12 | Sep 25 | 116 |
| Haines Airport | Apr 25 | May 7 | Oct 12 | 172 |
| Homer Airport | May 10 | May 23 | Sep 29 | 141 |
| Iliamna Airport | May 10 | May 25 | Oct 1 | 144 |
| Juneau Intl Airport | May 4 | May 18 | Oct 3 | 150 |
| Kaltag Airport | May 25 | Jun 11 | Sep 3 | 101 |
| Kenai 29 ENE | Jun 1 | Jun 18 | Sep 8 | 94 |
| Kenai Muni Airport | May 24 | Jun 4 | Sep 12 | 110 |
| Ketchikan Intl Airport | Apr 22 | May 9 | Oct 23 | 185 |
| King Salmon | May 26 | Jun 11 | Sep 15 | 111 |
| King Salmon 42 SE | Jun 9 | Jun 22 | Sep 11 | 93 |
| Kivalina Airport | Jun 10 | Jun 23 | Sep 11 | 92 |
| Klawock Airport | Apr 29 | May 14 | Oct 16 | 169 |
| Kodiak Airport | May 5 | May 21 | Oct 3 | 151 |
| Kotzebue Ralph Wein Airport | Jun 5 | Jun 17 | Sep 24 | 110 |
| Mcgrath Airport | May 13 | May 28 | Sep 13 | 120 |
| Metlakatla 6 S | Apr 14 | May 1 | Oct 25 | 192 |
| Nenana Muni Airport | May 15 | May 29 | Sep 11 | 117 |
| Nome Muni Airport | Jun 5 | Jun 26 | Sep 3 | 88 |
| Northway Airport | May 26 | Jun 8 | Sep 1 | 97 |
| Palmer Muni Airport | May 6 | May 18 | Sep 25 | 140 |
| Petersburg 1 | Apr 29 | May 14 | Oct 17 | 169 |
| Port Alsworth 1 SW | Jun 2 | Jun 13 | Sep 12 | 101 |
| Portage Glacier V C | May 27 | Jun 11 | Sep 12 | 106 |
| Ruby 44 ESE | May 22 | Jun 3 | Sep 3 | 101 |
| Sand Point 1 ENE | May 11 | May 25 | Oct 18 | 160 |
| Seldovia Airport | May 10 | May 24 | Oct 1 | 145 |
| Seward Airport | May 2 | May 17 | Oct 7 | 158 |
| Sitka 1 NE | May 3 | May 19 | Oct 18 | 166 |
| Sitka Airport | Apr 12 | Apr 30 | Nov 1 | 201 |
| Skagway Airport | Apr 21 | May 2 | Oct 17 | 176 |
| Skwentna | May 23 | Jun 4 | Sep 9 | 109 |
| St George Island Airport | May 31 | Jun 23 | Oct 5 | 128 |
| St Paul Island Airport | Jun 4 | Jun 25 | Sep 28 | 114 |
| St. Paul 4 NE | Jun 5 | Jul 1 | Sep 28 | 110 |
| Talkeetna Airport | May 16 | May 28 | Sep 16 | 122 |
| Tanana Calhoun Mem Airport | May 29 | Jun 16 | Aug 28 | 89 |
| Valdez Wso | Apr 30 | May 10 | Oct 2 | 157 |
| Yakutat 3 SSE | May 13 | May 29 | Sep 26 | 133 |
| Yakutat State Airport | May 20 | May 31 | Sep 23 | 124 |
All 163 weather stations in Alaska
| Station | Elevation (ft) | Last frost | Safer date | First frost | Season (days) |
|---|---|---|---|---|---|
| Alyeska | 272 | May 8 | May 22 | Sep 29 | 142 |
| Amber Lake | 449 | May 28 | Jun 9 | Sep 13 | 107 |
| Anchorage Forecast Office | 131 | May 5 | May 14 | Sep 29 | 147 |
| Anchorage Intl Airport | 120 | May 5 | May 15 | Oct 1 | 147 |
| Anchorage Lake Hood Airport | 90 | May 1 | May 8 | Oct 3 | 156 |
| Anchorage Merrill Fld | 138 | May 1 | May 9 | Sep 29 | 150 |
| Anchorage Rabbit Creek #2 | 913 | May 12 | May 24 | Sep 26 | 137 |
| Anchorage Upper De Armoun | 1,335 | May 7 | May 23 | Sep 28 | 143 |
| Anderson Lake | 458 | May 16 | May 31 | Sep 23 | 128 |
| Annette Island Airport | 109 | Apr 4 | Apr 22 | Oct 31 | 208 |
| Annex Creek | 92 | May 3 | May 18 | Oct 14 | 164 |
| Auke Bay | 44 | Apr 27 | May 11 | Oct 18 | 172 |
| Aurora | 443 | May 16 | May 29 | Sep 6 | 112 |
| Beaver Falls | 35 | Apr 4 | Apr 25 | Nov 9 | 218 |
| Ben's Farm | 127 | May 12 | May 24 | Sep 20 | 129 |
| Bethel Airport | 102 | May 21 | Jun 2 | Sep 22 | 122 |
| Bettles Airport | 642 | May 22 | Jun 5 | Aug 24 | 94 |
| Big Delta Airport | 1,277 | May 17 | May 31 | Sep 7 | 113 |
| Big River Lakes | 60 | May 7 | May 25 | Oct 7 | 151 |
| Campbell Creek Sci Ctr | 258 | May 28 | Jun 6 | Sep 12 | 107 |
| Cannery Creek | 85 | May 16 | May 29 | Oct 3 | 139 |
| Central #2 | 920 | May 25 | Jun 6 | Aug 26 | 92 |
| Clear Sky | 646 | May 24 | Jun 12 | Sep 4 | 100 |
| Cold Bay Airport | 78 | May 25 | Jun 10 | Oct 4 | 131 |
| College 5 NW | 978 | May 13 | May 31 | Sep 15 | 122 |
| College Obsy | 597 | May 18 | Jun 1 | Sep 6 | 111 |
| Cooper Lake Project | 505 | May 18 | May 31 | Sep 27 | 130 |
| Cooper Landing 5 W | 375 | Jun 12 | Jul 2 | Sep 1 | 78 |
| Cordova M K Smith Airport | 31 | May 23 | Jun 5 | Sep 19 | 118 |
| Cordova N | 25 | Apr 24 | May 8 | Oct 19 | 176 |
| Cordova Wwtp | 10 | Apr 29 | May 13 | Oct 13 | 169 |
| Craig | 43 | Apr 14 | May 2 | Nov 1 | 201 |
| Delta 5 NE | 1,060 | Jun 4 | Jul 17 | Aug 22 | 75 |
| Delta Junction 20 SE | 1,125 | Jun 5 | Jun 30 | Aug 21 | 75 |
| Denali 27 N | 2,225 | May 25 | Jun 3 | Sep 8 | 105 |
| Dry Creek | 1,355 | May 30 | Jun 13 | Aug 24 | 84 |
| Dutch Harbor | 10 | May 6 | May 22 | Oct 18 | 164 |
| Eagle | 850 | May 29 | Jun 11 | Aug 23 | 86 |
| Eagle Rvr 5 SE | 498 | May 21 | Jun 3 | Sep 15 | 116 |
| Eagle Rvr Gakona Circle | 567 | May 9 | May 22 | Sep 26 | 139 |
| Eagle Rvr Nature Ctr | 520 | May 16 | Jun 9 | Sep 20 | 125 |
| Eaglecrest Base | 1,134 | May 21 | Jun 2 | Oct 1 | 132 |
| Eielson Fld | 547 | May 20 | Jun 3 | Sep 1 | 104 |
| Eklutna Wtp | 640 | May 18 | May 30 | Sep 20 | 124 |
| Elfin Cove | 20 | Apr 26 | May 8 | Nov 1 | 188 |
| Ester | 655 | May 24 | Jun 4 | Sep 1 | 98 |
| Fairbanks 11 NE | 1,140 | May 12 | May 29 | Sep 16 | 124 |
| Fairbanks Airport #2 | 427 | May 16 | May 30 | Sep 8 | 113 |
| Fairbanks Intl Airport | 432 | May 13 | May 26 | Sep 13 | 121 |
| Fairbanks Midtown | 440 | May 13 | May 28 | Sep 10 | 119 |
| Farewell Lake | 1,060 | May 30 | Jun 15 | Sep 5 | 97 |
| Fox 2 SE | 775 | May 28 | Jun 9 | Sep 1 | 96 |
| Ft Knox Mine | 1,621 | May 12 | May 28 | Sep 17 | 126 |
| Ft Richardson Wtp | 470 | May 9 | May 22 | Sep 26 | 138 |
| Galena | 152 | May 18 | Jun 1 | Sep 8 | 111 |
| Gilmore Creek | 945 | Jun 1 | Jun 17 | Aug 28 | 87 |
| Glacier Bay | 45 | May 6 | May 26 | Oct 10 | 154 |
| Glen Alps | 2,202 | May 18 | May 31 | Sep 23 | 125 |
| Glennallen 64 N | 2,669 | Jun 5 | Jun 21 | Aug 24 | 76 |
| Gulkana Airport | 1,562 | Jun 7 | Jul 5 | Aug 21 | 73 |
| Gustavus | 40 | May 30 | Jun 22 | Sep 16 | 107 |
| Gustavus 2 NE | 20 | May 28 | Jun 12 | Sep 25 | 116 |
| Haines #2 | 95 | Apr 30 | May 13 | Oct 7 | 160 |
| Haines 40NW | 820 | May 24 | Jun 10 | Sep 20 | 118 |
| Haines Airport | 15 | Apr 25 | May 7 | Oct 12 | 172 |
| Hayes River | 1,000 | Jun 2 | Jun 11 | Sep 8 | 98 |
| Healy | 1,417 | May 27 | Jun 10 | Sep 1 | 97 |
| Hidden Falls Hatchery | 22 | Apr 29 | May 15 | Oct 25 | 176 |
| Homer 8 NW | 1,080 | May 16 | May 30 | Sep 30 | 136 |
| Homer 9 E | 512 | May 27 | Jun 8 | Sep 22 | 116 |
| Homer Airport | 64 | May 10 | May 23 | Sep 29 | 141 |
| Hoonah | 130 | May 9 | Jul 4 | Oct 4 | 145 |
| Hope | 180 | May 18 | May 28 | Sep 24 | 127 |
| Hyder | 80 | May 4 | May 23 | Oct 11 | 157 |
| Iliamna Airport | 143 | May 10 | May 25 | Oct 1 | 144 |
| Intricate Bay | 120 | Jun 4 | Jun 22 | Sep 12 | 98 |
| Juneau Dwtn | 50 | Apr 20 | May 5 | Oct 22 | 183 |
| Juneau Forecast Office | 106 | May 9 | May 24 | Oct 4 | 146 |
| Juneau Intl Airport | 16 | May 4 | May 18 | Oct 3 | 150 |
| Juneau Lena Pt | 35 | Apr 11 | Apr 27 | Nov 1 | 202 |
| Juneau Mile 17 | 245 | Apr 29 | May 10 | Oct 20 | 173 |
| Kaltag Airport | 181 | May 25 | Jun 11 | Sep 3 | 101 |
| Kenai 29 ENE | 282 | Jun 1 | Jun 18 | Sep 8 | 94 |
| Kenai 9N | 126 | May 18 | May 30 | Sep 22 | 125 |
| Kenai Muni Airport | 91 | May 24 | Jun 4 | Sep 12 | 110 |
| Ketchikan 10N | 295 | Apr 20 | May 4 | Oct 26 | 189 |
| Ketchikan Intl Airport | 76 | Apr 22 | May 9 | Oct 23 | 185 |
| Keystone Ridge | 1,600 | May 15 | May 31 | Sep 16 | 122 |
| King Salmon | 63 | May 26 | Jun 11 | Sep 15 | 111 |
| King Salmon 42 SE | 661 | Jun 9 | Jun 22 | Sep 11 | 93 |
| Kitoi Bay | 60 | May 11 | May 28 | Oct 6 | 149 |
| Kivalina Airport | 10 | Jun 10 | Jun 23 | Sep 11 | 92 |
| Klawock Airport | 12 | Apr 29 | May 14 | Oct 16 | 169 |
| Kobe Hill | 800 | May 24 | Jun 10 | Sep 2 | 100 |
| Kodiak Airport | 80 | May 5 | May 21 | Oct 3 | 151 |
| Kodiak Wwtp | 54 | Apr 29 | May 13 | Oct 14 | 168 |
| Kotzebue Ralph Wein Airport | 30 | Jun 5 | Jun 17 | Sep 24 | 110 |
| Lake Susitna | 2,375 | May 30 | Jun 9 | Sep 4 | 95 |
| Lazy Mtn | 733 | May 22 | Jun 3 | Sep 16 | 114 |
| Little Port Walter | 14 | Apr 21 | May 9 | Oct 31 | 190 |
| Little Su At Hatcher Pass Brg | 902 | May 18 | May 30 | Sep 18 | 122 |
| Main Bay | 57 | May 19 | Jun 4 | Oct 6 | 139 |
| Matanuska Exp Farm | 172 | May 14 | May 26 | Sep 20 | 127 |
| Mcgrath Airport | 333 | May 13 | May 28 | Sep 13 | 120 |
| Mckinley Park | 2,070 | Jun 6 | Jun 30 | Aug 25 | 77 |
| Metlakatla 6 S | 105 | Apr 14 | May 1 | Oct 25 | 192 |
| Mile 42 Steese | 960 | May 28 | Jun 19 | Aug 26 | 87 |
| Minchumina | 1,025 | May 13 | May 28 | Sep 17 | 124 |
| Monashka Creek Dam | 130 | May 27 | Jun 10 | Sep 23 | 117 |
| Moose Pass 3NW | 492 | May 31 | Jun 15 | Sep 8 | 99 |
| N Pole | 475 | May 18 | May 31 | Sep 5 | 110 |
| N Pole 1N | 496 | May 22 | Jun 4 | Sep 2 | 102 |
| Nabesna | 2,920 | Jun 4 | Jul 3 | Sep 1 | 85 |
| Nenana Muni Airport | 360 | May 15 | May 29 | Sep 11 | 117 |
| Nome Muni Airport | 13 | Jun 5 | Jun 26 | Sep 3 | 88 |
| Northway Airport | 1,713 | May 26 | Jun 8 | Sep 1 | 97 |
| Ouzinkie | 40 | May 9 | May 23 | Oct 4 | 148 |
| Palmer Job Corps | 216 | Apr 24 | May 9 | Oct 4 | 164 |
| Palmer Muni Airport | 230 | May 6 | May 18 | Sep 25 | 140 |
| Pelican | 12 | May 4 | May 18 | Oct 19 | 167 |
| Petersburg 1 | 107 | Apr 29 | May 14 | Oct 17 | 169 |
| Port Alcan | 1,892 | May 28 | Jun 10 | Aug 29 | 91 |
| Port Alexander | 12 | Apr 18 | May 5 | Nov 5 | 198 |
| Port Alsworth | 260 | May 12 | May 27 | Sep 24 | 134 |
| Port Alsworth 1 SW | 321 | Jun 2 | Jun 13 | Sep 12 | 101 |
| Port San Juan | 40 | May 10 | May 28 | Oct 7 | 150 |
| Portage Glacier V C | 103 | May 27 | Jun 11 | Sep 12 | 106 |
| Pt Baker | 20 | Apr 19 | May 5 | Oct 25 | 187 |
| Puntilla | 1,858 | Jun 7 | Jun 30 | Sep 2 | 83 |
| Ruby 44 ESE | 259 | May 22 | Jun 3 | Sep 3 | 101 |
| Sand Point 1 ENE | 240 | May 11 | May 25 | Oct 18 | 160 |
| Seldovia Airport | 29 | May 10 | May 24 | Oct 1 | 145 |
| Seward 19N | 518 | May 21 | May 31 | Sep 26 | 127 |
| Seward Airport | 22 | May 2 | May 17 | Oct 7 | 158 |
| Silver Lake | 1,200 | May 31 | Jun 10 | Sep 3 | 95 |
| Sitka 1 NE | 78 | May 3 | May 19 | Oct 18 | 166 |
| Sitka Airport | 14 | Apr 12 | Apr 30 | Nov 1 | 201 |
| Skagway | 35 | May 6 | May 22 | Oct 1 | 146 |
| Skagway Airport | 20 | Apr 21 | May 2 | Oct 17 | 176 |
| Skwentna | 150 | May 23 | Jun 4 | Sep 9 | 109 |
| Snettisham Pwr Plt | 29 | May 5 | May 22 | Oct 15 | 162 |
| Soldotna 5SSW | 180 | Jun 11 | Jul 7 | Sep 1 | 75 |
| St George Island Airport | 125 | May 31 | Jun 23 | Oct 5 | 128 |
| St Paul Island Airport | 35 | Jun 4 | Jun 25 | Sep 28 | 114 |
| St. Paul 4 NE | 20 | Jun 5 | Jul 1 | Sep 28 | 110 |
| Sterling 6SW | 292 | May 20 | Jun 1 | Sep 21 | 123 |
| Sutton 1 W | 550 | Jun 1 | Jun 13 | Sep 6 | 98 |
| Talkeetna Airport | 350 | May 16 | May 28 | Sep 16 | 122 |
| Tanana Calhoun Mem Airport | 227 | May 29 | Jun 16 | Aug 28 | 89 |
| Thorne Bay | 286 | May 1 | May 16 | Oct 13 | 166 |
| Tok #2 | 1,658 | Jun 3 | Jul 13 | Aug 27 | 79 |
| Two Rivers | 605 | May 30 | Jun 13 | Sep 2 | 95 |
| University Exp Stn | 475 | May 16 | May 30 | Sep 8 | 114 |
| Valdez | 62 | May 14 | May 26 | Sep 22 | 129 |
| Valdez Wso | 95 | Apr 30 | May 10 | Oct 2 | 157 |
| Wally Noerenberg Hatchery | 35 | May 20 | Jun 1 | Oct 9 | 142 |
| Whites Crossing | 270 | May 29 | Jun 9 | Sep 7 | 100 |
| Whitestone Farms | 995 | May 26 | Jun 9 | Sep 2 | 98 |
| Whittier | 60 | Apr 25 | May 8 | Oct 14 | 172 |
| Willow West | 205 | May 15 | May 28 | Sep 18 | 126 |
| Wrangell Airport | 56 | Apr 11 | Apr 29 | Nov 1 | 202 |
| Yakutat 3 SSE | 26 | May 13 | May 29 | Sep 26 | 133 |
| Yakutat State Airport | 33 | May 20 | May 31 | Sep 23 | 124 |
No station matches that name. Try a nearby town, or look up your ZIP code above.
Last frost and first frost are averages (a 50% chance of frost later in spring or earlier in fall). Safer date is the spring date with only a 10% chance of a later frost.
Using these dates
Plant hardy crops like peas and spinach several weeks before your last frost, and tender crops like tomatoes and peppers after it, once nights stay above 50°F. The Seed Starting Calculator turns your frost date into sowing and planting dates, and When to Plant Tomatoes explains the timing in detail.
Data: NOAA National Centers for Environmental Information, U.S. Climate Normals 1991–2020, 32°F threshold.
Frost dates in other states
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