Frost history / Angwin Pacific Union College, CA
Angwin Pacific Union College, CA: frost dates by year
Last spring and first fall frost at NOAA station USC00040212, 1953 to 2025, measured from daily minimum temperatures.
Elevation 1,715 ft, 38.573, -122.441. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Apr 18 | Nov 26 |
| Earliest | Jan 2 (2016) | Sep 30 (1971) |
| Latest | Jul 4 (1975) | Dec 29 (2014) |
| Trend | 5.4 days earlier per decade | 1.4 days later per decade |
| Years with data | 65, 1 with no freeze | 67, 7 with no freeze |
At 28°F (hard freeze) the median last spring date is Mar 8 and the median first fall date is Dec 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 2 | Nov 30 | none | none |
| 2024 | Apr 6 | Nov 15 | Jan 7 | none |
| 2023 | Apr 19 | none | Apr 4 | none |
| 2022 | May 10 | Nov 29 | Mar 5 | Dec 2 |
| 2021 | Mar 16 | Dec 14 | Jan 26 | Dec 28 |
| 2020 | Apr 6 | none | none | none |
| 2019 | Mar 8 | Nov 28 | Feb 11 | Nov 29 |
| 2018 | Apr 17 | Dec 2 | Feb 23 | none |
| 2017 | Mar 25 | none | Feb 23 | none |
| 2016 | Jan 2 | Dec 6 | none | Dec 25 |
| 2015 | Jan 3 | Nov 25 | none | Dec 25 |
| 2014 | Feb 5 | Dec 29 | none | none |
| 2013 | Mar 7 | Dec 5 | Jan 13 | Dec 5 |
| 2012 | Apr 15 | Nov 9 | Apr 5 | Dec 18 |
| 2011 | no data | Nov 4 | no data | none |
| 2010 | May 22 | Nov 24 | none | Nov 24 |
| 2009 | no data | Nov 18 | no data | Dec 7 |
| 2008 | Apr 21 | Dec 13 | Apr 20 | Dec 14 |
| 2007 | Apr 18 | Nov 30 | Jan 14 | Dec 1 |
| 2006 | no data | Nov 24 | no data | none |
| 2005 | no data | Nov 26 | no data | none |
| 2004 | no data | Nov 30 | no data | none |
| 2003 | Apr 6 | Nov 21 | none | Dec 26 |
| 2002 | Apr 28 | Dec 18 | Mar 8 | none |
| 2001 | Apr 15 | Dec 4 | Apr 8 | none |
| 2000 | May 11 | Nov 9 | Jan 2 | Nov 13 |
| 1999 | Apr 28 | none | Apr 9 | none |
| 1998 | no data | Dec 4 | no data | Dec 19 |
| 1997 | Apr 9 | Dec 27 | Jan 14 | none |
| 1996 | Feb 27 | Dec 2 | Feb 26 | none |
| 1995 | Apr 19 | none | Feb 14 | none |
| 1994 | Mar 23 | Nov 16 | Mar 23 | Dec 5 |
| 1993 | Feb 25 | Nov 23 | Jan 11 | none |
| 1992 | none | Dec 5 | none | Dec 18 |
| 1991 | Apr 7 | Dec 19 | none | none |
| 1990 | Mar 13 | Dec 13 | Feb 18 | Dec 20 |
| 1989 | Apr 24 | none | Feb 8 | none |
| 1988 | no data | Dec 23 | no data | Dec 25 |
| 1987 | Mar 22 | no data | Mar 19 | no data |
| 1986 | May 6 | no data | Mar 14 | no data |
| 1985 | May 29 | no data | Mar 28 | no data |
| 1984 | Apr 20 | Oct 17 | Feb 17 | Dec 16 |
| 1983 | May 10 | Nov 20 | none | Nov 23 |
| 1982 | Apr 15 | Nov 8 | Apr 7 | none |
| 1981 | Apr 11 | Dec 28 | none | none |
| 1980 | Apr 3 | Dec 1 | Mar 12 | none |
| 1979 | Apr 18 | Nov 19 | Feb 1 | none |
| 1978 | Apr 21 | no data | none | no data |
| 1977 | no data | Nov 18 | no data | Nov 19 |
| 1976 | Apr 11 | no data | Mar 3 | no data |
| 1975 | Jul 4 | no data | Apr 15 | no data |
| 1974 | May 18 | Nov 22 | Jan 11 | none |
| 1973 | Apr 1 | Nov 3 | Jan 26 | Nov 3 |
| 1972 | Apr 21 | Dec 4 | Feb 2 | Dec 5 |
| 1971 | Apr 24 | Sep 30 | Apr 24 | Oct 29 |
| 1970 | Apr 28 | Oct 27 | Apr 27 | Dec 20 |
| 1969 | Apr 3 | Dec 27 | Mar 11 | none |
| 1968 | Apr 16 | Nov 15 | Jan 28 | Dec 11 |
| 1967 | Apr 30 | Nov 28 | Apr 28 | Dec 13 |
| 1966 | Mar 17 | Nov 22 | Mar 3 | none |
| 1965 | May 6 | Nov 25 | Apr 7 | none |
| 1964 | May 7 | Nov 13 | May 6 | Nov 14 |
| 1963 | Apr 23 | none | Apr 21 | none |
| 1962 | Apr 28 | Dec 24 | Feb 28 | none |
| 1961 | Apr 22 | Nov 20 | Apr 19 | Nov 21 |
| 1960 | May 22 | Nov 27 | Apr 22 | none |
| 1959 | May 3 | Dec 4 | Feb 22 | none |
| 1958 | Apr 6 | Nov 15 | Mar 13 | Nov 15 |
| 1957 | Mar 21 | Dec 23 | Mar 16 | none |
| 1956 | Apr 1 | Oct 31 | Apr 1 | Dec 6 |
| 1955 | May 3 | Nov 11 | Apr 15 | Nov 12 |
| 1954 | Apr 30 | Nov 30 | Jan 25 | Nov 30 |
| 1953 | May 26 | Nov 20 | Apr 8 | none |
"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.