Frost history / Anchorage Forecast Office, AK
Anchorage Forecast Office, AK: frost dates by year
Last spring and first fall frost at NOAA station USC00500275, 1998 to 2025, measured from daily minimum temperatures.
Elevation 131 ft, 61.156, -149.985. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 5 | Sep 27 |
| Earliest | Apr 20 (2025) | Sep 9 (2012) |
| Latest | May 21 (2013) | Oct 27 (2018) |
| Trend | 4.3 days earlier per decade | 4.8 days later per decade |
| Years with data | 27 | 28 |
At 28°F (hard freeze) the median last spring date is Apr 24 and the median first fall date is Oct 3.
The trend is a straight-line fit through the years with a freeze. A positive spring trend means the last frost now comes later. Short or patchy records give noisy trends.
Chart
Last spring frost (32°F)
First fall frost (32°F)
Dots are single years. The gray line is the median, the green line the fitted trend.
Year by year
| Year | Last spring 32°F | First fall 32°F | Last spring 28°F | First fall 28°F |
|---|---|---|---|---|
| 2025 | Apr 20 | Oct 19 | Apr 12 | Oct 19 |
| 2024 | May 9 | Oct 2 | Apr 16 | Oct 15 |
| 2023 | May 5 | Sep 19 | Apr 25 | Oct 4 |
| 2022 | May 11 | Oct 10 | Apr 21 | Oct 12 |
| 2021 | May 5 | Sep 19 | May 1 | Sep 22 |
| 2020 | Apr 30 | Oct 10 | Apr 29 | Oct 16 |
| 2019 | Apr 28 | Sep 25 | Apr 27 | Oct 7 |
| 2018 | May 13 | Oct 27 | Apr 17 | Oct 29 |
| 2017 | May 5 | Oct 1 | Apr 19 | Oct 15 |
| 2016 | Apr 21 | Sep 30 | Apr 4 | Oct 7 |
| 2015 | May 2 | Sep 19 | Apr 24 | Sep 23 |
| 2014 | Apr 24 | Sep 22 | Apr 20 | Oct 1 |
| 2013 | May 21 | Sep 20 | May 19 | Sep 24 |
| 2012 | May 18 | Sep 9 | May 3 | Oct 1 |
| 2011 | May 2 | Sep 26 | Apr 28 | Oct 11 |
| 2010 | May 3 | Sep 27 | Apr 24 | Sep 27 |
| 2009 | May 5 | Sep 23 | Apr 21 | Oct 2 |
| 2008 | May 14 | Sep 28 | Apr 28 | Sep 29 |
| 2007 | Apr 30 | Oct 4 | Apr 26 | Oct 8 |
| 2006 | May 18 | Sep 30 | May 8 | Oct 14 |
| 2005 | May 16 | Oct 4 | Apr 19 | Oct 13 |
| 2004 | Apr 23 | Sep 14 | Apr 15 | Sep 18 |
| 2003 | May 2 | Sep 16 | Apr 19 | Sep 19 |
| 2002 | May 16 | Sep 21 | May 2 | Oct 3 |
| 2001 | May 17 | Sep 27 | May 5 | Oct 12 |
| 2000 | May 21 | Sep 17 | Apr 24 | Sep 29 |
| 1999 | May 8 | Sep 25 | Apr 29 | Sep 26 |
| 1998 | no data | Sep 28 | no data | Oct 1 |
"none" means the station recorded no freeze at that threshold in that half of the year. "no data" means more than 10% of the season's daily readings were missing. Years with no usable data are left out. See the methodology for the rules, and the ZIP lookup for 1991 to 2020 frost probabilities.