Frost history / Ft Richardson Wtp, AK
Ft Richardson Wtp, AK: frost dates by year
Last spring and first fall frost at NOAA station USC00503163, 1990 to 2025, measured from daily minimum temperatures.
Elevation 470 ft, 61.227, -149.650. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 8 | Sep 27 |
| Earliest | Apr 19 (2009) | Aug 28 (1998) |
| Latest | May 27 (2001) | Oct 20 (2009) |
| Trend | 2.9 days earlier per decade | 0.9 days later per decade |
| Years with data | 25 | 29 |
At 28°F (hard freeze) the median last spring date is Apr 21 and the median first fall date is Oct 8.
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 24 | Oct 19 | Apr 22 | Oct 19 |
| 2024 | May 10 | Sep 21 | Apr 17 | Oct 17 |
| 2023 | May 17 | Sep 28 | Apr 26 | Oct 3 |
| 2021 | May 5 | Sep 21 | Apr 17 | Sep 22 |
| 2020 | May 4 | Sep 12 | May 1 | Oct 16 |
| 2019 | no data | Sep 24 | no data | Oct 13 |
| 2018 | May 8 | no data | Apr 22 | no data |
| 2017 | no data | Oct 2 | no data | Oct 15 |
| 2016 | Apr 21 | Sep 29 | Apr 5 | Oct 12 |
| 2015 | no data | Aug 29 | no data | Sep 23 |
| 2013 | no data | Sep 20 | no data | Sep 20 |
| 2010 | Apr 25 | Sep 27 | Apr 16 | Sep 27 |
| 2009 | Apr 19 | Oct 20 | Apr 17 | Oct 29 |
| 2008 | May 21 | Sep 28 | Apr 27 | Sep 30 |
| 2007 | May 22 | Oct 3 | Apr 15 | Oct 8 |
| 2006 | no data | Sep 30 | no data | Oct 14 |
| 2005 | Apr 20 | Oct 11 | Apr 20 | Oct 12 |
| 2004 | May 15 | no data | Apr 12 | no data |
| 2003 | May 8 | Sep 14 | Apr 18 | Sep 14 |
| 2002 | May 11 | Sep 20 | May 4 | Oct 10 |
| 2001 | May 27 | Oct 8 | May 5 | Oct 11 |
| 2000 | May 27 | no data | May 10 | no data |
| 1999 | May 9 | Sep 26 | May 8 | Oct 9 |
| 1998 | May 14 | Aug 28 | Apr 30 | Sep 29 |
| 1997 | May 8 | Sep 29 | Apr 21 | Oct 3 |
| 1996 | May 3 | Sep 22 | Apr 13 | Sep 22 |
| 1995 | May 4 | Oct 6 | Apr 8 | Oct 13 |
| 1994 | no data | Sep 28 | no data | Oct 2 |
| 1993 | May 2 | Sep 23 | Apr 22 | Sep 23 |
| 1992 | May 18 | Sep 10 | May 11 | Sep 11 |
| 1991 | May 17 | Sep 23 | Apr 17 | Oct 8 |
| 1990 | no data | Oct 1 | no data | Oct 2 |
"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.