Frost history / Tracy Pumping Plt, CA
Tracy Pumping Plt, CA: frost dates by year
Last spring and first fall frost at NOAA station USC00049001, 1956 to 2025, measured from daily minimum temperatures.
Elevation 61 ft, 37.796, -121.583. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Feb 9 | Nov 30 |
| Earliest | Jan 3 (2015) | Oct 30 (1971) |
| Latest | Apr 22 (1961) | Dec 20 (2020) |
| Trend | 3.9 days earlier per decade | 2.7 days later per decade |
| Years with data | 62, 9 with no freeze | 62, 11 with no freeze |
At 28°F (hard freeze) the median last spring date is Jan 14 and the median first fall date is Dec 9.
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 | Jan 28 | none | none | none |
| 2024 | none | none | none | none |
| 2023 | Feb 18 | Nov 27 | none | none |
| 2022 | Feb 25 | Nov 30 | none | none |
| 2021 | none | Dec 11 | none | none |
| 2020 | Jan 17 | Dec 20 | none | Dec 23 |
| 2019 | Feb 11 | none | none | none |
| 2018 | Feb 28 | none | none | none |
| 2017 | Jan 6 | Dec 10 | none | Dec 13 |
| 2016 | none | Dec 18 | none | Dec 19 |
| 2015 | Jan 3 | Nov 30 | Jan 1 | Dec 27 |
| 2014 | none | none | none | none |
| 2013 | Feb 10 | Dec 5 | Jan 15 | Dec 6 |
| 2012 | Jan 18 | Dec 20 | Jan 18 | none |
| 2011 | Feb 26 | Dec 6 | Jan 10 | Dec 20 |
| 2010 | Jan 6 | Nov 26 | none | none |
| 2009 | Jan 11 | Dec 3 | none | Dec 9 |
| 2008 | Jan 19 | Dec 9 | none | Dec 9 |
| 2007 | Jan 31 | Dec 13 | Jan 19 | none |
| 2006 | Feb 19 | Nov 30 | none | Dec 19 |
| 2005 | none | Dec 15 | none | none |
| 2004 | Jan 23 | Nov 30 | none | Dec 4 |
| 2003 | Feb 9 | Dec 16 | none | none |
| 2002 | Feb 5 | none | Jan 31 | none |
| 2001 | Feb 1 | none | Jan 2 | none |
| 2000 | Jan 6 | Nov 18 | none | none |
| 1999 | Jan 30 | Dec 15 | Jan 2 | none |
| 1998 | none | Dec 10 | none | Dec 21 |
| 1997 | Jan 14 | Dec 11 | Jan 14 | none |
| 1996 | none | Dec 19 | none | none |
| 1995 | Apr 18 | none | none | none |
| 1994 | Feb 23 | Nov 29 | Feb 13 | Dec 28 |
| 1986 | Feb 10 | Nov 28 | none | Dec 2 |
| 1985 | Mar 8 | no data | Feb 6 | no data |
| 1984 | Feb 23 | Dec 17 | Jan 21 | Dec 17 |
| 1983 | Jan 11 | none | none | none |
| 1982 | Feb 10 | Dec 10 | Jan 13 | Dec 31 |
| 1981 | none | none | none | none |
| 1980 | Feb 9 | Nov 28 | none | Dec 9 |
| 1979 | Feb 5 | Nov 21 | Feb 3 | Nov 21 |
| 1978 | none | Nov 15 | none | Nov 15 |
| 1977 | Jan 11 | Dec 16 | Jan 9 | none |
| 1976 | Mar 4 | Nov 28 | Jan 4 | Dec 11 |
| 1975 | Feb 24 | Nov 22 | Jan 14 | Dec 15 |
| 1974 | Mar 9 | Nov 29 | Jan 9 | Dec 25 |
| 1973 | Jan 27 | none | Jan 7 | none |
| 1972 | Feb 3 | Nov 23 | Feb 3 | Dec 5 |
| 1971 | Mar 6 | Oct 30 | Mar 2 | Dec 17 |
| 1970 | Jan 6 | Dec 12 | Jan 6 | none |
| 1969 | Feb 8 | Nov 18 | Jan 10 | Nov 27 |
| 1968 | Jan 28 | Nov 28 | Jan 12 | Dec 3 |
| 1967 | Apr 1 | Nov 27 | Jan 17 | Nov 27 |
| 1966 | Mar 4 | Nov 25 | Mar 4 | Dec 28 |
| 1965 | Feb 24 | Dec 11 | Jan 1 | Dec 15 |
| 1964 | Mar 7 | Nov 16 | Jan 12 | Nov 19 |
| 1963 | Jan 25 | Dec 7 | Jan 25 | Dec 12 |
| 1962 | no data | Nov 30 | no data | Dec 25 |
| 1961 | Apr 22 | Nov 14 | Jan 2 | Dec 8 |
| 1960 | Feb 24 | Dec 6 | Jan 17 | Dec 8 |
| 1959 | Jan 4 | Nov 15 | Jan 4 | Dec 7 |
| 1958 | Mar 12 | Nov 17 | Jan 22 | Nov 17 |
| 1957 | Feb 5 | Nov 23 | Feb 5 | Dec 3 |
| 1956 | Mar 13 | Nov 21 | Feb 17 | Nov 22 |
"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.