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Frost Date Finder

NOAA 1991–2020 freeze normals

Frost Dates in Alaska

Last and first frost at the 38 NOAA stations behind this site's Alaska pages.

At the middle station of the 38 in Alaska where a freeze comes every year, the last spring frost (50%) is May 12 and the first fall frost September 26, a freeze-free season of 137 days. The last frost is earliest at Ketchikan (Beaver Falls, AK, April 4) and latest at Kasilof (Soldotna 5SSW, AK, June 11), 68 days apart. The season runs from 75 days at Kasilof to 218 at Ketchikan.

22 of these stations were also in NOAA's previous normals, for 1981–2010. Between the two, the median station's freeze-free season grew 5 days longer, with the last spring frost 2 days earlier and the first fall frost 4 days later; the season lengthened at 17 stations and shortened at 5. The two periods share twenty years, so the change reflects mostly 2011–2020 against 1981–1990.

Alaska places by frost date

Frost dates of the Alaska places with a page, largest first
PlaceZIPLast frostFirst frostSeasonWinters with 32°F
Wasilla99654May 16September 23128 d100%
Anchorage99504May 28September 12107 d100%
Anchorage99508May 1September 29150 d100%
Palmer99645May 6September 25140 d100%
Juneau99801May 4October 3150 d100%
Fairbanks99709May 16September 8114 d100%
Eagle River99577May 9September 26139 d100%
Anchorage99502May 5September 29147 d100%
North Pole99705May 22September 2102 d100%
Anchorage99516May 12September 26137 d100%
Fairbanks99701May 16September 6112 d100%
Anchorage99517May 1October 3156 d100%
Kenai99611May 24September 12110 d100%
Soldotna99669May 20September 21123 d100%
Ketchikan99901April 4November 9218 d100%
Kodiak99615May 5October 3151 d100%
Fairbanks99712May 12September 16124 d100%
Homer99603May 10September 29141 d100%
Sitka99835May 3October 18166 d100%
Bethel99559May 21September 22122 d100%
Chugiak99567May 18September 20124 d100%
Jber99505May 9September 26138 d100%
Delta Junction99737May 17September 7113 d100%
Seward99664May 2October 7158 d100%
Nome99762June 5September 388 d100%
Big Lake99652May 29September 7100 d100%
Valdez99686April 30October 2157 d100%
Unalaska99685May 6October 18164 d100%
Petersburg99833April 29October 17169 d100%
Eielson Afb99702May 20September 1104 d100%
Kotzebue99752June 5September 24110 d100%
Anchor Point99556May 16September 30136 d100%
Willow99688May 15September 18126 d100%
Cordova99574May 23September 19118 d100%
Kasilof99610June 11September 175 d100%
Haines99827April 25October 12172 d100%
Douglas99824April 20October 22183 d100%
Wrangell99929April 11November 1202 d100%

50% dates from NOAA NCEI U.S. Climate Normals 1991–2020, one row per station; a state page is published when at least 5 stations stand behind its pages. Where a freeze comes in fewer than nine winters in ten, the dates describe the winters that have one.