Frost dates 2026–2027

Alaska frost dates by city

Across 11 Alaska cities, the average first fall frost ranges from September 6 in Fairbanks to November 9 in Ketchikan. Median 32°F dates from NOAA 1991–2020 normals.

CityPopulationLast spring frostFirst fall frostGrowing seasonZone
Anchorage 287,155 May 16 Sep 20 125 days 5a
Juneau 31,609 May 3 Oct 14 164 days 6a
Fairbanks 31,468 May 16 Sep 6 112 days 2a
Wasilla 10,556 May 16 Sep 23 128 days 5a
Sitka 8,319 May 3 Oct 18 166 days 7b
Ketchikan 7,939 Apr 4 Nov 9 218 days 8a
Kenai 7,924 May 24 Sep 12 110 days 4b
Palmer 6,710 May 6 Sep 25 140 days 5a
Bethel 6,626 May 21 Sep 22 122 days 4a
Homer 6,331 May 10 Sep 29 141 days 6a
Kodiak 5,281 Apr 29 Oct 14 168 days 7b
Cities with 5,000+ residents (Census 2025 estimates). Sources: NOAA NCEI 1991–2020 normals; USDA/Oregon State PRISM 2023 hardiness zones.

Growing zones in Alaska · Frost dates in other states