Frost history / Ben Lomond #4, CA
Ben Lomond #4, CA: frost dates by year
Last spring and first fall frost at NOAA station USC00040673, 1973 to 2023, measured from daily minimum temperatures.
Elevation 420 ft, 37.086, -122.080. Download the data (JSON) · NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Mar 25 | Nov 11 |
| Earliest | Jan 25 (1978) | Aug 26 (2014) |
| Latest | Jun 29 (2015) | Dec 17 (1995) |
| Trend | 3.9 days later per decade | 2.7 days earlier per decade |
| Years with data | 48 | 50 |
At 28°F (hard freeze) the median last spring date is Feb 14 and the median first fall date is Nov 28.
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 |
|---|---|---|---|---|
| 2023 | Apr 13 | Oct 29 | Mar 27 | none |
| 2022 | May 10 | Nov 11 | Mar 11 | Nov 30 |
| 2021 | Mar 21 | Nov 24 | Jan 26 | Dec 11 |
| 2020 | Feb 20 | Nov 9 | Feb 5 | Nov 9 |
| 2019 | Mar 15 | Oct 29 | Feb 23 | Dec 29 |
| 2018 | Mar 19 | Nov 9 | Mar 5 | Nov 10 |
| 2017 | Mar 3 | Dec 5 | Jan 6 | Dec 13 |
| 2016 | Mar 31 | Nov 18 | Mar 21 | Dec 18 |
| 2015 | Jun 29 | Sep 3 | Apr 19 | Oct 21 |
| 2014 | May 13 | Aug 26 | Apr 10 | Sep 10 |
| 2013 | Mar 23 | Nov 4 | Feb 10 | Dec 4 |
| 2012 | Mar 12 | Nov 11 | Mar 8 | Dec 19 |
| 2011 | Apr 10 | Nov 9 | Feb 28 | Dec 4 |
| 2010 | Mar 14 | Nov 24 | none | Nov 24 |
| 2009 | Apr 29 | Nov 9 | Mar 10 | Dec 4 |
| 2008 | Apr 21 | Oct 13 | Feb 15 | Dec 14 |
| 2007 | Mar 29 | Nov 21 | Jan 26 | Nov 23 |
| 2006 | Mar 19 | Nov 10 | Feb 22 | Nov 30 |
| 2005 | Mar 16 | Nov 20 | Jan 14 | Nov 27 |
| 2004 | Feb 13 | Nov 20 | Feb 10 | Nov 22 |
| 2003 | Apr 5 | no data | Feb 9 | no data |
| 2002 | no data | Oct 31 | no data | none |
| 2001 | no data | Nov 7 | no data | Dec 15 |
| 2000 | Apr 18 | Nov 11 | Jan 6 | Nov 12 |
| 1999 | Apr 10 | Nov 22 | Mar 7 | Dec 15 |
| 1998 | Apr 16 | Oct 30 | Mar 7 | Dec 5 |
| 1997 | Apr 1 | Dec 2 | Jan 14 | Dec 12 |
| 1996 | Mar 30 | Oct 21 | none | Dec 20 |
| 1995 | Mar 28 | Dec 17 | Feb 15 | none |
| 1994 | Mar 23 | Nov 3 | Feb 14 | Nov 14 |
| 1993 | Feb 28 | Nov 15 | Jan 5 | Nov 24 |
| 1992 | Feb 5 | Nov 11 | Jan 23 | Nov 11 |
| 1991 | Apr 8 | Oct 31 | Feb 1 | none |
| 1990 | Mar 13 | Nov 23 | Feb 20 | Nov 24 |
| 1989 | Mar 4 | Nov 1 | Feb 14 | Nov 29 |
| 1988 | Mar 17 | Nov 18 | Feb 5 | Dec 26 |
| 1987 | Mar 24 | Nov 26 | Feb 27 | Nov 27 |
| 1986 | Mar 14 | Nov 26 | Feb 10 | Nov 26 |
| 1985 | Mar 26 | Nov 12 | Feb 10 | Nov 13 |
| 1984 | Apr 27 | Nov 1 | Jan 18 | Dec 22 |
| 1983 | Apr 13 | Nov 8 | none | none |
| 1982 | Apr 7 | Nov 14 | Feb 5 | Dec 30 |
| 1981 | Feb 23 | Nov 29 | none | none |
| 1980 | no data | Nov 12 | no data | Nov 12 |
| 1979 | Feb 17 | Nov 20 | Feb 4 | Nov 21 |
| 1978 | Jan 25 | Nov 2 | none | Nov 12 |
| 1977 | Apr 22 | Nov 9 | Mar 14 | Nov 20 |
| 1976 | Apr 2 | Nov 28 | Mar 6 | Nov 28 |
| 1975 | Apr 17 | Oct 24 | Feb 23 | Nov 19 |
| 1974 | Mar 10 | Nov 23 | Mar 9 | Dec 24 |
| 1973 | Mar 24 | Nov 3 | Jan 28 | Nov 4 |
"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 1991–2020 frost probabilities.