Frost history / San Luis Obispo Ap, CA
San Luis Obispo Ap, CA: frost dates by year
Last spring and first fall frost at NOAA station USW00093206, 1998 to 2024, measured from daily minimum temperatures.
Elevation 200 ft, 35.237, -120.641. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Feb 16 | Dec 6 |
| Earliest | Jan 1 (2016) | Nov 11 (2000) |
| Latest | Apr 8 (2001) | Dec 28 (2019) |
| Trend | 7.1 days earlier per decade | 12.7 days later per decade |
| Years with data | 26, 5 with no freeze | 27, 6 with no freeze |
At 28°F (hard freeze) the median last spring date is Jan 24 and the median first fall date is Dec 6.
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 |
|---|---|---|---|---|
| 2024 | none | none | none | none |
| 2023 | Feb 16 | none | none | none |
| 2022 | Feb 24 | Dec 17 | none | none |
| 2021 | Jan 26 | Dec 19 | none | none |
| 2020 | Feb 11 | none | Feb 4 | none |
| 2019 | Feb 23 | Dec 28 | none | none |
| 2018 | Feb 28 | none | none | none |
| 2017 | none | Dec 22 | none | none |
| 2016 | Jan 1 | Dec 25 | none | none |
| 2015 | Jan 4 | Dec 27 | Jan 1 | none |
| 2014 | none | Dec 27 | none | none |
| 2013 | Feb 25 | Dec 6 | none | Dec 6 |
| 2012 | Mar 8 | Dec 20 | none | none |
| 2011 | Feb 27 | Dec 3 | none | none |
| 2010 | none | Nov 26 | none | none |
| 2009 | none | Nov 20 | none | none |
| 2008 | Feb 15 | Dec 14 | none | none |
| 2007 | Jan 24 | Nov 26 | Jan 15 | none |
| 2006 | Mar 13 | Nov 30 | none | none |
| 2005 | Jan 14 | none | none | none |
| 2004 | Jan 23 | Nov 22 | none | none |
| 2003 | Feb 9 | Nov 23 | none | none |
| 2002 | Mar 16 | Dec 24 | Feb 1 | none |
| 2001 | Apr 8 | none | none | none |
| 2000 | Jan 7 | Nov 11 | none | Nov 13 |
| 1999 | Apr 4 | Dec 4 | none | none |
| 1998 | no data | Dec 4 | no data | Dec 20 |
"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.