Frost history / Calistoga, CA
Calistoga, CA: frost dates by year
Last spring and first fall frost at NOAA station USC00041312, 1981 to 2025, measured from daily minimum temperatures.
Elevation 400 ft, 38.596, -122.601. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Mar 23 | Nov 15 |
| Earliest | Jan 14 (2016) | Sep 26 (1982) |
| Latest | May 14 (1984) | Dec 30 (2025) |
| Trend | 7.2 days earlier per decade | 4.2 days later per decade |
| Years with data | 32 | 33 |
At 28°F (hard freeze) the median last spring date is Feb 13 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 |
|---|---|---|---|---|
| 2025 | Feb 12 | Dec 30 | Feb 11 | none |
| 2024 | Feb 11 | Nov 28 | none | Nov 30 |
| 2023 | Apr 4 | Nov 26 | Feb 24 | Nov 28 |
| 2022 | Mar 12 | Nov 14 | Feb 25 | Nov 20 |
| 2021 | no data | Dec 11 | no data | none |
| 2020 | Apr 6 | Nov 9 | none | none |
| 2019 | no data | Oct 31 | no data | Nov 29 |
| 2017 | Feb 26 | no data | none | no data |
| 2016 | Jan 14 | Dec 17 | none | Dec 19 |
| 2015 | Feb 24 | Nov 5 | Jan 3 | Nov 16 |
| 2014 | Feb 5 | Dec 25 | Feb 5 | none |
| 2013 | Mar 31 | Oct 28 | Feb 20 | Nov 30 |
| 2012 | Apr 7 | Nov 9 | Mar 8 | Dec 13 |
| 2011 | Apr 9 | Nov 3 | Mar 1 | Nov 19 |
| 2008 | Apr 30 | Oct 15 | Apr 22 | Oct 15 |
| 2007 | Mar 3 | Nov 21 | Feb 3 | Nov 21 |
| 2006 | Mar 14 | Nov 10 | Feb 21 | Nov 24 |
| 2005 | Apr 14 | Nov 19 | Jan 14 | Nov 27 |
| 2004 | Feb 28 | Nov 23 | Jan 23 | Nov 30 |
| 2003 | Apr 5 | Nov 1 | Feb 12 | Nov 1 |
| 2002 | Apr 28 | no data | Mar 8 | no data |
| 2001 | no data | Nov 26 | no data | none |
| 1994 | Mar 23 | no data | Feb 13 | no data |
| 1993 | Apr 10 | Nov 16 | Jan 26 | Nov 16 |
| 1992 | Feb 5 | Nov 9 | Jan 24 | Dec 5 |
| 1991 | Mar 14 | Oct 31 | Jan 30 | Dec 4 |
| 1990 | Feb 19 | Nov 15 | Feb 18 | Nov 26 |
| 1989 | Feb 28 | Nov 27 | Feb 15 | Dec 12 |
| 1988 | Mar 13 | Dec 1 | Feb 5 | Dec 26 |
| 1987 | Mar 23 | Dec 15 | Mar 21 | Dec 31 |
| 1986 | Apr 2 | Nov 23 | Mar 15 | Nov 29 |
| 1985 | Mar 28 | Nov 11 | Feb 11 | Nov 13 |
| 1984 | May 14 | Nov 26 | Jan 14 | Dec 16 |
| 1983 | May 10 | Nov 8 | Jan 20 | none |
| 1982 | Apr 9 | Sep 26 | Mar 17 | Nov 14 |
| 1981 | no data | Oct 11 | 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.