Frost history / Colfax, CA
Colfax, CA: frost dates by year
Last spring and first fall frost at NOAA station USC00041912, 1951 to 2025, measured from daily minimum temperatures.
Elevation 2,380 ft, 39.091, -120.948. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Apr 16 | Nov 19 |
| Earliest | Feb 22 (1959) | Oct 9 (2008) |
| Latest | May 21 (1960) | Dec 25 (2014) |
| Trend | little change (less than half a day per decade) | 0.5 days later per decade |
| Years with data | 66 | 68 |
At 28°F (hard freeze) the median last spring date is Mar 1 and the median first fall date is Dec 4.
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 | Mar 18 | Nov 30 | Feb 12 | none |
| 2024 | Apr 6 | Nov 15 | Jan 10 | Nov 28 |
| 2023 | Apr 18 | Oct 27 | Apr 4 | none |
| 2022 | May 10 | Nov 3 | Apr 11 | none |
| 2021 | Mar 16 | Dec 10 | Mar 11 | Dec 29 |
| 2020 | Mar 27 | Nov 9 | Feb 4 | Nov 9 |
| 2019 | Apr 10 | Nov 26 | Feb 22 | Dec 27 |
| 2018 | Apr 17 | Dec 2 | Mar 18 | Dec 10 |
| 2017 | Apr 9 | Dec 21 | Mar 5 | Dec 21 |
| 2016 | Mar 29 | Nov 17 | none | Dec 7 |
| 2015 | Apr 8 | Nov 11 | Jan 21 | Nov 26 |
| 2014 | Mar 30 | Dec 25 | none | Dec 25 |
| 2013 | Apr 16 | Dec 4 | Feb 20 | Dec 4 |
| 2012 | Apr 6 | Nov 10 | Jan 17 | Nov 11 |
| 2011 | May 15 | Dec 13 | Apr 8 | none |
| 2010 | Apr 29 | Nov 23 | none | Nov 24 |
| 2009 | Apr 29 | no data | Apr 15 | no data |
| 2008 | Apr 30 | Oct 9 | Apr 21 | Dec 3 |
| 2007 | Apr 20 | Dec 1 | Mar 1 | Dec 1 |
| 2006 | Apr 16 | Nov 24 | Mar 18 | Nov 28 |
| 2005 | no data | Nov 27 | no data | Dec 17 |
| 2004 | Mar 4 | Oct 27 | Feb 11 | Nov 29 |
| 2003 | Apr 28 | Nov 1 | Feb 28 | Nov 22 |
| 2002 | Apr 18 | Dec 18 | Mar 18 | Dec 23 |
| 2001 | Apr 21 | Nov 26 | Feb 15 | Nov 27 |
| 2000 | May 11 | Nov 10 | Feb 24 | Nov 12 |
| 1999 | Apr 10 | Nov 22 | Apr 9 | Dec 8 |
| 1998 | Apr 16 | Nov 9 | Mar 7 | Dec 4 |
| 1997 | no data | Dec 2 | no data | Dec 21 |
| 1995 | Apr 21 | no data | Mar 25 | no data |
| 1994 | Apr 26 | Nov 3 | Mar 23 | Nov 13 |
| 1993 | Mar 1 | Nov 12 | Feb 28 | Nov 13 |
| 1992 | Mar 8 | Nov 9 | Jan 23 | Nov 23 |
| 1991 | no data | Oct 31 | no data | Nov 30 |
| 1990 | Mar 13 | Nov 1 | Mar 13 | Nov 27 |
| 1989 | Mar 26 | Nov 27 | Mar 3 | Nov 27 |
| 1988 | May 1 | Nov 18 | Feb 6 | Dec 26 |
| 1987 | Mar 24 | Nov 15 | Mar 22 | Nov 26 |
| 1986 | Apr 2 | Nov 30 | Feb 9 | Dec 28 |
| 1985 | Mar 29 | Nov 9 | Mar 29 | Nov 12 |
| 1984 | Apr 19 | Nov 25 | Jan 21 | Dec 17 |
| 1983 | Apr 14 | Nov 20 | Jan 20 | Nov 21 |
| 1982 | Apr 8 | Nov 9 | Jan 30 | Dec 25 |
| 1981 | Feb 26 | Nov 29 | Jan 31 | none |
| 1980 | Mar 26 | Nov 25 | Jan 29 | Dec 8 |
| 1979 | Mar 17 | Nov 19 | Feb 3 | Nov 20 |
| 1978 | Apr 21 | Nov 12 | none | Nov 15 |
| 1977 | May 6 | Nov 19 | Mar 14 | Nov 19 |
| 1976 | Apr 16 | Nov 27 | Apr 1 | Nov 28 |
| 1975 | May 20 | Nov 11 | Apr 17 | Nov 19 |
| 1974 | May 18 | Dec 8 | Jan 11 | Dec 23 |
| 1972 | no data | Oct 29 | no data | Nov 19 |
| 1971 | Apr 21 | no data | Mar 2 | no data |
| 1968 | Mar 18 | Nov 15 | Jan 28 | Dec 20 |
| 1967 | Apr 29 | Nov 30 | Jan 6 | Dec 7 |
| 1966 | Mar 20 | Nov 22 | Mar 4 | Dec 25 |
| 1965 | Apr 11 | Nov 26 | Feb 12 | Dec 14 |
| 1964 | Apr 24 | Nov 10 | Mar 7 | Nov 14 |
| 1963 | Apr 21 | Dec 10 | Jan 19 | Dec 11 |
| 1962 | Mar 23 | Nov 28 | Feb 28 | Dec 24 |
| 1961 | Apr 24 | Nov 17 | none | Dec 9 |
| 1960 | May 21 | Nov 19 | Mar 10 | Dec 6 |
| 1959 | Feb 22 | Nov 20 | Feb 13 | Dec 31 |
| 1958 | Apr 23 | Nov 15 | Jan 22 | Nov 15 |
| 1957 | Apr 21 | Nov 16 | Feb 4 | none |
| 1956 | no data | Oct 24 | no data | Dec 7 |
| 1955 | Apr 27 | Nov 12 | Apr 2 | none |
| 1954 | Mar 24 | Nov 30 | Mar 11 | Dec 11 |
| 1953 | Apr 11 | Nov 18 | Apr 9 | none |
| 1952 | Mar 21 | Nov 16 | Mar 19 | Nov 25 |
| 1951 | Apr 30 | Nov 22 | Mar 10 | Dec 9 |
"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.