Frost history / Mt Shasta, CA
Mt Shasta, CA: frost dates by year
Last spring and first fall frost at NOAA station USW00024215, 1996 to 2024, measured from daily minimum temperatures.
Elevation 3,535 ft, 41.333, -122.333. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 12 | Oct 12 |
| Earliest | Apr 16 (2015) | Sep 16 (2006) |
| Latest | Jun 26 (2012) | Nov 4 (2015) |
| Trend | 2.4 days earlier per decade | 2.2 days later per decade |
| Years with data | 28 | 29 |
At 28°F (hard freeze) the median last spring date is Apr 16 and the median first fall date is Oct 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 |
|---|---|---|---|---|
| 2024 | May 6 | Oct 18 | Mar 15 | Nov 16 |
| 2023 | May 10 | Oct 12 | Apr 20 | Oct 26 |
| 2022 | May 13 | Oct 23 | May 9 | Nov 2 |
| 2021 | Apr 28 | Oct 8 | Apr 15 | Nov 7 |
| 2020 | May 4 | Oct 23 | Mar 27 | Oct 25 |
| 2019 | May 2 | Sep 30 | Mar 30 | Oct 9 |
| 2018 | Jun 10 | Oct 11 | Apr 17 | Oct 15 |
| 2017 | Jun 10 | Sep 22 | Apr 15 | Nov 5 |
| 2016 | Apr 26 | Oct 1 | Mar 8 | Nov 17 |
| 2015 | Apr 16 | Nov 4 | Apr 9 | Nov 5 |
| 2014 | Apr 28 | Oct 26 | Mar 22 | Nov 16 |
| 2013 | May 2 | Sep 27 | Apr 23 | Nov 17 |
| 2012 | Jun 26 | Oct 21 | Apr 6 | Nov 9 |
| 2011 | Jun 3 | Oct 25 | May 1 | Oct 26 |
| 2010 | May 22 | Oct 25 | May 22 | Oct 26 |
| 2009 | May 13 | Oct 1 | Apr 16 | Oct 6 |
| 2008 | May 1 | Oct 12 | Apr 24 | Nov 21 |
| 2007 | May 3 | Sep 24 | May 3 | Oct 21 |
| 2006 | Apr 19 | Sep 16 | Apr 18 | Oct 26 |
| 2005 | May 21 | Sep 25 | Apr 14 | Oct 2 |
| 2004 | May 12 | Sep 21 | Mar 3 | Oct 25 |
| 2003 | May 19 | Oct 11 | Apr 19 | Oct 31 |
| 2002 | May 23 | Oct 11 | Mar 26 | Oct 12 |
| 2001 | Jun 4 | Oct 24 | Apr 29 | Nov 7 |
| 2000 | May 12 | Sep 23 | May 12 | Oct 23 |
| 1999 | May 16 | Oct 17 | May 16 | Oct 29 |
| 1998 | May 18 | Oct 16 | Apr 16 | Oct 17 |
| 1997 | May 2 | Oct 13 | Apr 7 | Oct 25 |
| 1996 | no data | Oct 14 | no data | Oct 17 |
"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.