Frost history / Mt Laguna #3, CA
Mt Laguna #3, CA: frost dates by year
Last spring and first fall frost at NOAA station USC00045968, 2009 to 2025, measured from daily minimum temperatures.
Elevation 5,920 ft, 32.867, -116.419. Download the data (JSON) · NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 11 | Nov 1 |
| Earliest | Apr 27 (2025) | Sep 28 (2014) |
| Latest | May 27 (2019) | Dec 5 (2017) |
| Trend | 4.9 days earlier per decade | 16.4 days later per decade |
| Years with data | 13 | 16 |
At 28°F (hard freeze) the median last spring date is Apr 14 and the median first fall date is Nov 16.
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 27 | Nov 18 | Apr 4 | Nov 19 |
| 2024 | May 6 | Oct 29 | Apr 8 | Nov 16 |
| 2023 | May 10 | Nov 8 | Apr 14 | none |
| 2022 | May 11 | Nov 3 | Apr 12 | Nov 3 |
| 2021 | May 23 | Oct 12 | May 22 | Dec 10 |
| 2020 | May 20 | Oct 26 | Apr 9 | Nov 9 |
| 2019 | May 27 | Oct 30 | Mar 11 | Nov 26 |
| 2018 | May 2 | Nov 10 | Apr 17 | Dec 28 |
| 2017 | May 16 | Dec 5 | May 7 | Dec 21 |
| 2016 | Apr 28 | Nov 22 | Mar 29 | Dec 17 |
| 2015 | May 15 | Nov 3 | May 8 | Nov 5 |
| 2014 | May 21 | Sep 28 | Apr 26 | Dec 14 |
| 2013 | May 8 | Oct 10 | Apr 18 | Nov 16 |
| 2012 | no data | Nov 9 | no data | Nov 10 |
| 2011 | no data | Oct 7 | no data | Nov 5 |
| 2009 | no data | Oct 5 | no data | Oct 28 |
"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.