Frost history / Oroville, CA
Oroville, CA: frost dates by year
Last spring and first fall frost at NOAA station USC00046521, 1953 to 2022, measured from daily minimum temperatures.
Elevation 171 ft, 39.518, -121.553. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Feb 23 | Nov 27 |
| Earliest | Jan 3 (2015) | Oct 24 (1971) |
| Latest | May 11 (2010) | Dec 30 (2014) |
| Trend | 1.0 days earlier per decade | 1.7 days later per decade |
| Years with data | 44, 1 with no freeze | 45, 5 with no freeze |
At 28°F (hard freeze) the median last spring date is Jan 24 and the median first fall date is Dec 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 |
|---|---|---|---|---|
| 2022 | Feb 25 | no data | none | no data |
| 2021 | Jan 26 | Dec 18 | none | none |
| 2020 | Feb 6 | none | Feb 3 | none |
| 2019 | Feb 18 | Nov 29 | none | none |
| 2018 | Mar 5 | none | Mar 1 | none |
| 2017 | no data | none | no data | none |
| 2016 | Jan 29 | Nov 17 | Jan 1 | Dec 1 |
| 2015 | Jan 3 | Nov 26 | none | Dec 31 |
| 2014 | none | Dec 30 | none | none |
| 2013 | Feb 20 | Dec 4 | Jan 14 | Dec 5 |
| 2012 | Mar 7 | Dec 20 | Jan 18 | none |
| 2011 | Apr 13 | no data | Feb 23 | no data |
| 2010 | May 11 | Nov 9 | Mar 9 | Nov 23 |
| 2009 | no data | Dec 6 | no data | Dec 6 |
| 2006 | Feb 21 | no data | none | no data |
| 2005 | no data | Dec 3 | no data | none |
| 2004 | Jan 4 | Nov 28 | none | none |
| 2002 | Mar 18 | none | Jan 31 | none |
| 1997 | Mar 15 | Dec 27 | Feb 26 | none |
| 1996 | no data | Nov 7 | no data | Dec 23 |
| 1995 | Mar 25 | none | Feb 16 | none |
| 1994 | Feb 15 | Nov 13 | none | Nov 19 |
| 1993 | Jan 14 | Nov 23 | Jan 3 | Nov 25 |
| 1992 | Jan 31 | Dec 18 | Jan 24 | none |
| 1991 | Apr 11 | Nov 1 | Jan 30 | Dec 20 |
| 1990 | no data | Nov 25 | no data | Nov 28 |
| 1989 | no data | Nov 8 | no data | Dec 12 |
| 1988 | no data | Dec 1 | no data | Dec 27 |
| 1987 | Jan 18 | no data | Jan 16 | no data |
| 1983 | Jan 15 | no data | Jan 2 | no data |
| 1975 | Feb 21 | no data | Jan 30 | no data |
| 1974 | Feb 23 | Dec 22 | Jan 2 | Dec 23 |
| 1973 | Jan 28 | Nov 19 | Jan 8 | none |
| 1972 | Mar 26 | no data | Jan 30 | no data |
| 1971 | Mar 5 | Oct 24 | Mar 1 | Dec 21 |
| 1970 | Jan 6 | Dec 19 | Jan 6 | none |
| 1969 | Mar 13 | Nov 30 | Jan 31 | none |
| 1968 | Jan 17 | Dec 4 | Jan 11 | Dec 20 |
| 1967 | Jan 23 | Dec 6 | Jan 6 | Dec 16 |
| 1966 | Mar 3 | Nov 23 | none | Dec 26 |
| 1965 | Feb 10 | Nov 28 | Jan 8 | Dec 15 |
| 1963 | Jan 25 | Nov 21 | Jan 21 | Dec 7 |
| 1962 | Feb 27 | Nov 29 | Feb 27 | Dec 26 |
| 1961 | Mar 5 | Nov 17 | Jan 3 | Nov 17 |
| 1960 | Feb 28 | Dec 8 | Jan 16 | none |
| 1959 | Jan 31 | Nov 17 | Jan 4 | Dec 8 |
| 1958 | Mar 11 | Nov 15 | none | Nov 16 |
| 1957 | Mar 22 | Nov 22 | Feb 4 | Dec 2 |
| 1956 | Mar 7 | Nov 21 | Mar 6 | Dec 7 |
| 1955 | Apr 27 | Nov 15 | Feb 21 | none |
| 1954 | Mar 14 | Nov 30 | Jan 25 | Nov 30 |
| 1953 | no data | Nov 18 | no data | 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.