Frost history / Kaltag Ap, AK
Kaltag Ap, AK: frost dates by year
Last spring and first fall frost at NOAA station USW00026502, 1998 to 2024, measured from daily minimum temperatures.
Elevation 181 ft, 64.327, -158.742. Download the data (JSON) · NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Jun 2 | Aug 29 |
| Earliest | May 20 (2004) | Aug 1 (2000) |
| Latest | Jul 31 (2003) | Oct 13 (2007) |
| Trend | 4.8 days earlier per decade | 7.4 days later per decade |
| Years with data | 20 | 22 |
At 28°F (hard freeze) the median last spring date is May 14 and the median first fall date is Sep 14.
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 28 | Sep 1 | May 14 | Sep 20 |
| 2023 | Jun 2 | no data | Jun 2 | no data |
| 2021 | Jun 5 | no data | May 23 | no data |
| 2018 | Jun 16 | Sep 7 | May 7 | Oct 1 |
| 2017 | May 28 | Aug 29 | May 5 | Sep 26 |
| 2016 | May 22 | Sep 7 | Apr 25 | Sep 7 |
| 2015 | Jun 6 | Aug 30 | May 5 | Sep 18 |
| 2014 | Jul 25 | Aug 29 | May 8 | Aug 30 |
| 2013 | no data | Aug 25 | no data | Sep 17 |
| 2012 | Jun 3 | Sep 1 | May 15 | Sep 9 |
| 2011 | Jul 16 | Aug 3 | May 12 | Sep 24 |
| 2010 | Jun 2 | Sep 1 | May 7 | Sep 21 |
| 2009 | May 31 | Aug 16 | May 16 | Aug 26 |
| 2008 | May 31 | Aug 3 | May 5 | Aug 26 |
| 2007 | May 22 | Oct 13 | May 14 | Oct 13 |
| 2006 | Jun 5 | Aug 19 | Jun 3 | Oct 21 |
| 2005 | May 23 | Aug 31 | May 17 | Sep 1 |
| 2004 | May 20 | Aug 28 | May 3 | Sep 6 |
| 2003 | Jul 31 | Sep 10 | May 24 | Sep 10 |
| 2002 | Jul 4 | Aug 14 | May 31 | Aug 20 |
| 2001 | Jun 1 | Aug 3 | May 27 | Sep 16 |
| 2000 | no data | Aug 1 | no data | Aug 26 |
| 1999 | no data | Sep 5 | no data | Sep 22 |
| 1998 | no data | Aug 7 | no data | Sep 12 |
"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 1991–2020 frost probabilities.