Frost history / Anchorage Merrill Fld, AK
Anchorage Merrill Fld, AK: frost dates by year
Last spring and first fall frost at NOAA station USW00026409, 1951 to 2024, measured from daily minimum temperatures.
Elevation 138 ft, 61.217, -149.855. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 2 | Sep 25 |
| Earliest | Apr 19 (2003) | Sep 4 (1952) |
| Latest | Jun 6 (1952) | Oct 15 (2018) |
| Trend | 3.2 days earlier per decade | 1.6 days later per decade |
| Years with data | 30 | 29 |
At 28°F (hard freeze) the median last spring date is Apr 22 and the median first fall date is Oct 7.
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 |
|---|---|---|---|---|
| 2024 | May 10 | Sep 22 | Apr 16 | Oct 15 |
| 2023 | May 5 | Sep 19 | Apr 25 | Oct 3 |
| 2022 | May 11 | Oct 10 | Apr 20 | Oct 13 |
| 2021 | May 1 | Sep 19 | Apr 17 | Sep 22 |
| 2020 | May 2 | Sep 11 | Apr 26 | Oct 16 |
| 2019 | Apr 28 | Sep 25 | Apr 27 | Oct 7 |
| 2018 | Apr 27 | Oct 15 | Apr 15 | Oct 29 |
| 2017 | May 5 | Oct 1 | Apr 19 | Oct 15 |
| 2016 | Apr 21 | Sep 28 | Mar 20 | Oct 7 |
| 2015 | Apr 24 | Sep 19 | Apr 14 | Sep 23 |
| 2014 | Apr 24 | Sep 25 | Apr 11 | Oct 7 |
| 2013 | May 20 | Sep 20 | May 19 | Oct 24 |
| 2012 | May 3 | Sep 10 | May 2 | Oct 1 |
| 2011 | May 2 | Sep 26 | Apr 1 | Oct 11 |
| 2010 | Apr 24 | Sep 27 | Apr 24 | Sep 28 |
| 2009 | Apr 28 | Sep 28 | Apr 16 | Oct 2 |
| 2008 | Apr 28 | Sep 28 | Apr 28 | Oct 2 |
| 2007 | Apr 30 | Oct 4 | Apr 21 | Oct 8 |
| 2006 | May 8 | Sep 30 | Apr 20 | Oct 15 |
| 2005 | Apr 23 | Oct 4 | Apr 23 | Oct 13 |
| 2004 | Apr 23 | Sep 14 | Apr 12 | Sep 16 |
| 2003 | Apr 19 | Sep 14 | Apr 9 | Oct 12 |
| 2002 | May 10 | Sep 21 | Apr 25 | Oct 9 |
| 2001 | May 5 | Sep 27 | May 3 | Oct 11 |
| 2000 | May 3 | Sep 9 | Apr 11 | Sep 29 |
| 1999 | May 8 | Sep 26 | Apr 26 | Sep 26 |
| 1998 | Apr 30 | Sep 29 | Apr 24 | Oct 2 |
| 1953 | May 11 | no data | May 9 | no data |
| 1952 | Jun 6 | Sep 4 | May 13 | Sep 7 |
| 1951 | May 25 | Sep 24 | May 6 | Oct 7 |
"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.