San Jacinto, CA: frost dates by year

Last spring and first fall frost at NOAA station USC00047813, 1981 to 2025, measured from daily minimum temperatures.

Elevation 1,525 ft, 33.796, -116.975. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Feb 25	Dec 8
Earliest	Jan 4 (2015)	Nov 3 (1990)
Latest	Apr 10 (1999)	Dec 29 (2018)
Trend	10.1 days earlier per decade	8.8 days later per decade
Years with data	31, 2 with no freeze	30, 6 with no freeze

At 28°F (hard freeze) the median last spring date is Jan 17 and the median first fall date is Dec 8.

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	Jan 13	none	none	none
2024	Jan 9	none	none	none
2023	Feb 16	none	none	none
2022	Feb 25	none	none	none
2021	none	Dec 16	none	none
2020	Feb 5	none	Feb 5	none
2019	Feb 23	none	none	none
2018	Feb 25	Dec 29	none	none
2017	none	Dec 22	none	none
2016	Feb 2	Dec 18	none	none
2015	Jan 4	Dec 15	Jan 2	Dec 16
2014	Feb 2	Dec 26	none	none
2013	Feb 26	Dec 9	Jan 15	Dec 10
2012	Jan 19	Dec 20	none	Dec 21
2011	Feb 28	Dec 4	none	Dec 4
2010	Feb 23	Nov 25	none	Nov 30
2009	Feb 11	Dec 23	Jan 5	none
2007	Mar 3	Dec 10	Jan 17	none
2001	no data	Nov 27	no data	Nov 28
2000	Mar 6	Nov 12	none	Dec 17
1999	Apr 10	no data	none	no data
1998	no data	Dec 7	no data	Dec 7
1997	Mar 3	Dec 9	Jan 11	Dec 25
1994	Feb 14	Nov 3	Jan 11	Nov 19
1993	Jan 24	Dec 7	Jan 4	Dec 29
1991	Mar 26	no data	Jan 25	no data
1990	no data	Nov 3	no data	Nov 26
1987	Feb 28	Nov 26	Jan 21	Dec 13
1986	Feb 17	Dec 12	Feb 10	none
1985	Mar 29	no data	Mar 5	no data
1984	Feb 27	Nov 21	Feb 18	Nov 26
1983	Apr 6	Nov 22	Jan 2	Nov 27
1982	Apr 1	Nov 15	Jan 22	Dec 25
1981	Feb 27	no data	none	no data

"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.