Frost history / San Luis Obispo Poly, CA
San Luis Obispo Poly, CA: frost dates by year
Last spring and first fall frost at NOAA station USC00047851, 1951 to 2025, measured from daily minimum temperatures.
Elevation 308 ft, 35.306, -120.662. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Feb 13 | Dec 2 |
| Earliest | Jan 1 (1961) | Oct 28 (1971) |
| Latest | May 29 (1987) | Dec 31 (1959) |
| Trend | 1.1 days earlier per decade | 0.5 days earlier per decade |
| Years with data | 68, 22 with no freeze | 69, 39 with no freeze |
At 28°F (hard freeze) the median last spring date is Jan 22 and the median first fall date is Dec 17.
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 | none | none | none | none |
| 2024 | none | none | none | none |
| 2023 | Feb 17 | none | none | none |
| 2022 | Feb 24 | none | none | none |
| 2021 | Jan 26 | none | none | none |
| 2020 | Feb 4 | none | none | none |
| 2019 | Jan 4 | none | none | none |
| 2018 | Feb 28 | none | none | none |
| 2017 | none | none | none | none |
| 2016 | Jan 1 | none | none | none |
| 2015 | Jan 23 | Dec 27 | Jan 23 | none |
| 2014 | none | none | none | none |
| 2013 | Feb 10 | Dec 6 | none | none |
| 2012 | Feb 27 | Dec 19 | Feb 26 | none |
| 2011 | Feb 27 | Dec 4 | none | none |
| 2010 | none | Nov 26 | none | none |
| 2009 | none | Dec 6 | none | none |
| 2008 | no data | Dec 26 | no data | none |
| 2007 | Jan 23 | no data | Jan 14 | no data |
| 2004 | none | Nov 21 | none | Nov 24 |
| 2003 | no data | Nov 29 | no data | none |
| 2002 | Feb 1 | none | none | none |
| 2001 | none | none | none | none |
| 2000 | none | none | none | none |
| 1999 | Apr 4 | none | none | none |
| 1998 | none | Nov 16 | none | Dec 23 |
| 1997 | none | no data | none | no data |
| 1996 | Feb 27 | none | none | none |
| 1995 | none | none | none | none |
| 1994 | Feb 20 | none | none | none |
| 1993 | Jan 5 | none | none | none |
| 1992 | none | none | none | none |
| 1991 | Jan 30 | none | none | none |
| 1990 | Feb 16 | no data | Feb 16 | no data |
| 1989 | Jan 15 | none | none | none |
| 1988 | no data | Nov 18 | no data | Nov 24 |
| 1987 | May 29 | Nov 21 | Jan 18 | Dec 26 |
| 1986 | no data | Nov 7 | no data | none |
| 1985 | no data | Nov 13 | no data | none |
| 1984 | Apr 9 | Dec 14 | none | Dec 17 |
| 1983 | Jan 5 | none | none | none |
| 1982 | Mar 23 | Nov 13 | Jan 7 | none |
| 1981 | none | none | none | none |
| 1980 | none | none | none | none |
| 1979 | Feb 2 | Nov 21 | Jan 29 | none |
| 1978 | none | no data | none | no data |
| 1977 | none | none | none | none |
| 1976 | Mar 4 | Nov 30 | none | none |
| 1975 | Apr 26 | Nov 29 | none | none |
| 1974 | Jan 3 | Nov 28 | none | none |
| 1973 | Jan 8 | none | none | none |
| 1972 | Apr 20 | Dec 9 | none | Dec 11 |
| 1971 | Mar 8 | Oct 28 | Jan 4 | Dec 17 |
| 1970 | Apr 14 | none | none | none |
| 1969 | Jan 30 | Dec 30 | none | none |
| 1968 | Jan 29 | Dec 22 | none | Dec 22 |
| 1967 | Jan 9 | Dec 14 | none | Dec 16 |
| 1966 | Mar 4 | none | none | none |
| 1965 | none | Dec 18 | none | none |
| 1964 | Mar 3 | Nov 16 | none | none |
| 1963 | Jan 23 | none | Jan 21 | none |
| 1962 | Mar 1 | Dec 27 | Mar 1 | none |
| 1961 | Jan 1 | none | none | none |
| 1960 | Jan 5 | Dec 7 | none | none |
| 1959 | none | Dec 31 | none | none |
| 1958 | none | none | none | none |
| 1957 | Jan 29 | none | Jan 28 | none |
| 1956 | Feb 17 | none | none | none |
| 1955 | Feb 5 | none | none | none |
| 1954 | none | none | none | none |
| 1953 | none | none | none | none |
| 1952 | Feb 18 | none | Jan 3 | none |
| 1951 | Mar 3 | none | none | 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.