Frost history / Moose Pass 3NW, AK
Moose Pass 3NW, AK: frost dates by year
Last spring and first fall frost at NOAA station USC00505894, 1953 to 2023, measured from daily minimum temperatures.
Elevation 492 ft, 60.503, -149.426. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Jun 2 | Sep 6 |
| Earliest | May 14 (2016) | Aug 11 (1969) |
| Latest | Jul 19 (1967) | Oct 2 (1995) |
| Trend | 3.1 days earlier per decade | 1.2 days later per decade |
| Years with data | 33 | 36 |
At 28°F (hard freeze) the median last spring date is May 16 and the median first fall date is Sep 25.
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 |
|---|---|---|---|---|
| 2023 | May 22 | no data | Apr 29 | no data |
| 2022 | May 25 | Sep 21 | May 19 | Oct 9 |
| 2021 | May 24 | Aug 26 | May 6 | Sep 6 |
| 2020 | no data | Sep 10 | no data | Sep 10 |
| 2019 | May 19 | Aug 18 | Apr 28 | Sep 26 |
| 2018 | Jun 2 | no data | May 13 | no data |
| 2017 | Jun 1 | no data | May 5 | no data |
| 2016 | May 14 | Sep 19 | Apr 21 | Sep 28 |
| 2015 | May 26 | Sep 2 | May 4 | Sep 2 |
| 2014 | Jun 12 | Sep 1 | May 2 | Sep 25 |
| 2013 | May 28 | Sep 16 | May 24 | Sep 21 |
| 2011 | Jun 17 | Sep 23 | May 13 | Sep 26 |
| 2010 | no data | Sep 23 | no data | Sep 24 |
| 2002 | May 24 | Sep 19 | May 16 | Sep 21 |
| 1999 | Jun 3 | no data | May 20 | no data |
| 1997 | Jun 4 | Sep 3 | May 8 | Oct 1 |
| 1996 | no data | Aug 28 | no data | Sep 7 |
| 1995 | Jun 2 | Oct 2 | May 18 | Oct 16 |
| 1994 | Jun 1 | Aug 23 | May 16 | Sep 7 |
| 1993 | May 27 | Aug 24 | Apr 26 | Sep 23 |
| 1992 | Jun 20 | Sep 8 | May 17 | Sep 11 |
| 1991 | no data | Sep 19 | no data | Oct 7 |
| 1990 | no data | Aug 29 | no data | Oct 3 |
| 1989 | Jun 17 | Sep 18 | May 17 | Oct 8 |
| 1988 | May 27 | Sep 8 | May 2 | Sep 26 |
| 1987 | May 30 | Aug 31 | Apr 28 | Sep 14 |
| 1986 | Jun 13 | no data | May 19 | no data |
| 1985 | Jun 17 | Aug 25 | May 22 | Sep 21 |
| 1984 | May 31 | Aug 28 | May 31 | Aug 28 |
| 1983 | no data | Sep 5 | no data | Sep 7 |
| 1977 | no data | Sep 25 | no data | Oct 1 |
| 1976 | Jun 2 | Sep 5 | May 25 | Oct 2 |
| 1975 | Jun 7 | Aug 29 | May 17 | Oct 7 |
| 1974 | no data | Aug 23 | no data | Sep 28 |
| 1973 | Jun 4 | Aug 16 | May 19 | Sep 28 |
| 1971 | Jun 22 | Sep 10 | Jun 4 | Sep 25 |
| 1970 | Jun 5 | Sep 7 | May 19 | Sep 9 |
| 1969 | Jun 2 | Aug 11 | May 15 | Aug 15 |
| 1968 | Jun 2 | Sep 14 | May 9 | Sep 18 |
| 1967 | Jul 19 | Sep 11 | May 15 | Oct 2 |
| 1953 | Jun 9 | Sep 10 | May 24 | Sep 28 |
"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.