Frost history / Sonora, CA
Sonora, CA: frost dates by year
Last spring and first fall frost at NOAA station USC00048353, 1956 to 2025, measured from daily minimum temperatures.
Elevation 1,675 ft, 37.967, -120.387. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Apr 15 | Nov 10 |
| Earliest | Feb 6 (2014) | Oct 6 (2007) |
| Latest | May 17 (1974) | Dec 10 (1959) |
| Trend | 0.9 days earlier per decade | 1.2 days earlier per decade |
| Years with data | 35 | 42 |
At 28°F (hard freeze) the median last spring date is Mar 14 and the median first fall date is Nov 26.
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 19 | no data | Mar 9 | no data |
| 2024 | no data | Nov 12 | no data | Nov 16 |
| 2021 | Mar 17 | no data | Jan 26 | no data |
| 2020 | Apr 5 | Nov 10 | Feb 6 | Nov 10 |
| 2019 | no data | Oct 28 | no data | Nov 26 |
| 2018 | Apr 14 | Nov 11 | Mar 6 | Dec 29 |
| 2017 | Apr 14 | Dec 4 | Mar 1 | Dec 4 |
| 2016 | Mar 30 | Nov 17 | Feb 4 | Dec 2 |
| 2015 | Apr 16 | Nov 5 | Feb 25 | Nov 26 |
| 2014 | Feb 6 | Nov 17 | Feb 6 | Dec 26 |
| 2013 | Mar 24 | Nov 5 | Feb 28 | Dec 4 |
| 2012 | Apr 8 | Nov 9 | Apr 6 | Nov 11 |
| 2011 | Apr 15 | Nov 5 | Apr 10 | Nov 5 |
| 2010 | May 12 | Nov 9 | Mar 14 | Nov 24 |
| 2009 | Apr 29 | Oct 6 | Apr 16 | Dec 6 |
| 2008 | no data | Oct 10 | no data | Dec 14 |
| 2007 | no data | Oct 6 | no data | Nov 24 |
| 2006 | Apr 18 | Oct 31 | Mar 19 | Nov 29 |
| 2005 | Apr 15 | Nov 27 | Jan 31 | Nov 27 |
| 2000 | no data | Oct 31 | no data | Nov 11 |
| 1999 | no data | Nov 22 | no data | Nov 22 |
| 1994 | no data | Nov 8 | no data | Nov 13 |
| 1993 | Apr 15 | Nov 15 | Apr 15 | Nov 25 |
| 1992 | no data | Nov 10 | no data | Nov 10 |
| 1977 | Apr 2 | no data | Mar 18 | no data |
| 1976 | Apr 26 | Nov 25 | Apr 1 | Nov 27 |
| 1975 | May 4 | Oct 23 | Apr 17 | Nov 18 |
| 1974 | May 17 | Nov 23 | Mar 5 | Dec 10 |
| 1973 | no data | Nov 3 | no data | Nov 4 |
| 1972 | Apr 20 | Oct 29 | Mar 28 | Nov 23 |
| 1971 | Apr 26 | Oct 17 | Apr 21 | Oct 28 |
| 1970 | Apr 29 | Oct 28 | Apr 28 | Dec 13 |
| 1969 | Apr 7 | Nov 17 | Mar 14 | Nov 17 |
| 1968 | Apr 22 | no data | Mar 19 | no data |
| 1967 | May 1 | Nov 27 | Apr 29 | Dec 2 |
| 1966 | Mar 22 | Nov 23 | Mar 22 | Dec 22 |
| 1965 | May 6 | Nov 22 | Feb 23 | Dec 15 |
| 1964 | no data | Nov 14 | no data | Nov 14 |
| 1963 | Apr 17 | Nov 7 | Apr 2 | Nov 22 |
| 1962 | Mar 23 | Nov 18 | Mar 3 | Dec 26 |
| 1961 | May 7 | Nov 16 | May 7 | Nov 17 |
| 1960 | Mar 3 | Nov 19 | Jan 17 | Dec 6 |
| 1959 | Feb 24 | Dec 10 | Feb 14 | Dec 14 |
| 1958 | Mar 12 | Nov 15 | Mar 1 | Nov 16 |
| 1957 | no data | Nov 6 | no data | Dec 22 |
| 1956 | Apr 3 | Oct 24 | Mar 7 | Dec 7 |
"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.