Frost history / Dutch Harbor, AK
Dutch Harbor, AK: frost dates by year
Last spring and first fall frost at NOAA station USC00502587, 1951 to 2025, measured from daily minimum temperatures.
Elevation 10 ft, 53.895, -166.543. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 10 | Oct 23 |
| Earliest | Apr 10 (2016) | Aug 15 (2004) |
| Latest | Jun 19 (2004) | Nov 27 (2018) |
| Trend | 0.8 days earlier per decade | 4.4 days later per decade |
| Years with data | 35 | 36 |
At 28°F (hard freeze) the median last spring date is Apr 19 and the median first fall date is Nov 5.
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 16 | no data | Apr 13 | no data |
| 2024 | May 14 | no data | Apr 20 | no data |
| 2022 | May 18 | Nov 21 | Apr 8 | Dec 24 |
| 2021 | no data | Nov 3 | no data | Nov 23 |
| 2020 | May 1 | Nov 2 | Mar 12 | Dec 2 |
| 2019 | Apr 23 | Nov 22 | Mar 15 | Dec 27 |
| 2018 | no data | Nov 27 | no data | Dec 11 |
| 2017 | Apr 21 | no data | Apr 8 | no data |
| 2016 | Apr 10 | Nov 3 | Mar 22 | Nov 14 |
| 2015 | Apr 21 | Nov 15 | Apr 17 | Nov 25 |
| 2014 | Apr 18 | Oct 14 | Apr 7 | Dec 24 |
| 2013 | May 18 | Nov 21 | May 4 | Nov 23 |
| 2012 | Jun 3 | Oct 31 | May 12 | Nov 2 |
| 2011 | May 11 | Nov 2 | Apr 26 | Nov 8 |
| 2010 | May 1 | Oct 22 | Apr 30 | Nov 3 |
| 2009 | May 11 | Oct 28 | Apr 24 | Nov 1 |
| 2008 | no data | Oct 12 | no data | Nov 6 |
| 2007 | May 15 | Oct 19 | Apr 13 | Nov 14 |
| 2006 | May 11 | Nov 8 | Apr 27 | Dec 11 |
| 2005 | May 21 | Oct 27 | Apr 19 | Oct 27 |
| 2004 | Jun 19 | Aug 15 | Apr 6 | Nov 1 |
| 2003 | Apr 17 | Nov 16 | Mar 28 | Nov 17 |
| 2002 | Apr 26 | Oct 21 | Apr 12 | Oct 22 |
| 2001 | no data | Oct 10 | no data | Nov 4 |
| 2000 | May 21 | Sep 28 | Apr 28 | Oct 6 |
| 1999 | Apr 28 | no data | Apr 14 | no data |
| 1998 | Apr 20 | Oct 21 | Apr 7 | Oct 24 |
| 1997 | May 1 | Oct 30 | Apr 22 | Oct 30 |
| 1996 | May 15 | no data | May 13 | no data |
| 1995 | May 3 | Oct 24 | Apr 25 | Oct 30 |
| 1994 | May 15 | Sep 13 | May 7 | Sep 13 |
| 1993 | May 10 | Sep 5 | Apr 20 | Sep 5 |
| 1992 | May 10 | Sep 11 | May 4 | Oct 2 |
| 1991 | May 30 | Aug 20 | Apr 12 | Sep 5 |
| 1990 | no data | Sep 19 | no data | Nov 7 |
| 1988 | no data | Oct 7 | no data | Oct 7 |
| 1987 | no data | Sep 10 | no data | Oct 26 |
| 1985 | May 14 | no data | Apr 26 | no data |
| 1984 | no data | Oct 7 | no data | Oct 7 |
| 1954 | May 5 | no data | Apr 15 | no data |
| 1953 | May 10 | Oct 18 | Mar 30 | Nov 24 |
| 1952 | May 9 | Nov 7 | Apr 26 | Nov 16 |
| 1951 | Apr 30 | Nov 1 | Apr 28 | Nov 27 |
"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.