Frost history / Quincy, CA
Quincy, CA: frost dates by year
Last spring and first fall frost at NOAA station USC00047195, 1951 to 2025, measured from daily minimum temperatures.
Elevation 3,420 ft, 39.937, -120.948. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 24 | Sep 16 |
| Earliest | Apr 20 (2025) | Aug 1 (1955) |
| Latest | Jul 31 (1961) | Oct 23 (2020) |
| Trend | 5.7 days earlier per decade | 7.4 days later per decade |
| Years with data | 49 | 49 |
At 28°F (hard freeze) the median last spring date is May 2 and the median first fall date is Oct 4.
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 | Apr 20 | Oct 12 | Apr 5 | Nov 26 |
| 2024 | May 8 | Oct 18 | Apr 9 | Oct 19 |
| 2023 | Apr 25 | Oct 12 | Apr 21 | Oct 27 |
| 2022 | May 21 | Oct 16 | Apr 18 | Oct 23 |
| 2021 | May 21 | Sep 30 | Apr 18 | Oct 9 |
| 2020 | Jun 8 | Oct 23 | Apr 15 | Oct 23 |
| 2019 | May 2 | Sep 29 | May 1 | Oct 10 |
| 2018 | May 2 | Sep 14 | Apr 14 | Oct 14 |
| 2017 | May 18 | Sep 23 | Apr 29 | Sep 23 |
| 2016 | Apr 27 | Sep 23 | Apr 26 | Oct 2 |
| 2015 | May 13 | Oct 23 | Apr 18 | Oct 26 |
| 2014 | May 12 | Oct 2 | May 11 | Nov 3 |
| 2013 | May 24 | Sep 27 | May 3 | Sep 27 |
| 2012 | Jun 10 | no data | May 5 | no data |
| 2011 | Jun 3 | Oct 6 | May 1 | Oct 26 |
| 2010 | May 25 | Oct 19 | May 7 | Oct 27 |
| 2009 | Apr 30 | Sep 30 | Apr 16 | Oct 4 |
| 2008 | May 13 | Oct 9 | May 1 | Oct 10 |
| 2007 | Jun 7 | Sep 25 | Apr 20 | Sep 30 |
| 2006 | May 29 | Sep 16 | Apr 19 | Sep 16 |
| 2005 | Apr 21 | Sep 12 | Apr 20 | Oct 6 |
| 2004 | May 12 | Sep 21 | Apr 23 | Sep 21 |
| 2003 | May 18 | Sep 18 | Apr 19 | Oct 11 |
| 2002 | May 23 | Sep 7 | May 8 | Oct 1 |
| 2001 | Jul 21 | Oct 9 | May 4 | Oct 10 |
| 2000 | May 31 | Sep 5 | May 12 | Sep 24 |
| 1999 | no data | Aug 31 | no data | Oct 13 |
| 1997 | no data | Sep 20 | no data | Oct 6 |
| 1995 | Jun 8 | Sep 30 | Apr 22 | Oct 23 |
| 1994 | no data | Oct 7 | no data | Oct 13 |
| 1991 | no data | Oct 23 | no data | Oct 24 |
| 1972 | Jun 11 | no data | May 10 | no data |
| 1971 | May 18 | Sep 3 | May 18 | Sep 8 |
| 1970 | May 20 | Aug 24 | May 11 | Sep 14 |
| 1969 | May 20 | Aug 6 | Apr 27 | Oct 4 |
| 1968 | Jun 30 | Sep 7 | May 15 | Sep 20 |
| 1967 | May 14 | Sep 14 | May 13 | Oct 14 |
| 1966 | Jul 15 | Aug 31 | May 2 | Sep 14 |
| 1965 | Jul 10 | Aug 27 | May 8 | Sep 18 |
| 1964 | May 23 | Aug 29 | May 15 | Sep 3 |
| 1963 | May 10 | Aug 24 | Apr 24 | Nov 19 |
| 1962 | Jun 5 | Sep 9 | May 20 | Sep 19 |
| 1961 | Jul 31 | Aug 1 | May 4 | Sep 24 |
| 1960 | Jun 21 | Aug 23 | May 23 | Sep 22 |
| 1959 | Jun 10 | Aug 28 | May 19 | Sep 28 |
| 1958 | May 14 | Sep 11 | Apr 30 | Sep 24 |
| 1957 | Jul 31 | no data | Apr 25 | no data |
| 1956 | Jun 12 | Aug 5 | May 14 | Sep 11 |
| 1955 | Jul 17 | Aug 1 | Jun 24 | Aug 23 |
| 1954 | Jun 17 | Aug 6 | May 27 | Aug 16 |
| 1953 | Jul 1 | no data | May 28 | no data |
| 1952 | Jun 16 | Aug 27 | Jun 13 | Aug 27 |
| 1951 | Jun 7 | Aug 31 | May 14 | Sep 12 |
"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.