Trona, CA: frost dates by year

Last spring and first fall frost at NOAA station USC00049035, 1951 to 2025, measured from daily minimum temperatures.

Elevation 1,695 ft, 35.764, -117.391. Download the data (JSON) · NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Mar 4	Nov 21
Earliest	Jan 6 (2015)	Oct 29 (1970)
Latest	Apr 24 (1964)	Dec 28 (2014)
Trend	4.9 days earlier per decade	0.9 days later per decade
Years with data	62, 3 with no freeze	71, 8 with no freeze

At 28°F (hard freeze) the median last spring date is Feb 6 and the median first fall date is Dec 3.

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 31	none	Jan 24	none
2024	Jan 16	Nov 20	Jan 11	Dec 12
2023	Feb 22	Nov 11	none	none
2022	Feb 28	Nov 21	Feb 26	Dec 15
2021	Mar 2	Dec 11	Feb 27	Dec 18
2020	Feb 6	Nov 10	Feb 6	Dec 6
2019	Feb 24	Oct 31	Feb 13	Nov 2
2018	Mar 6	Nov 12	Feb 25	Dec 31
2017	Feb 19	Dec 10	Feb 19	Dec 13
2016	Feb 6	Dec 2	Feb 4	Dec 18
2015	Jan 6	Nov 29	Jan 5	Nov 29
2014	no data	Dec 28	no data	Dec 28
2013	no data	Dec 2	no data	Dec 5
2012	Mar 4	Nov 11	Feb 5	Dec 20
2011	Mar 1	Nov 9	Feb 4	Dec 6
2010	Jan 25	Nov 25	Jan 6	Nov 26
2009	Feb 15	Nov 17	Jan 7	Dec 9
2008	Feb 8	Dec 15	Jan 21	Dec 27
2007	Mar 3	Nov 22	Jan 25	Dec 12
2006	Mar 14	Nov 29	Feb 22	Dec 2
2005	Jan 13	Nov 28	none	Dec 6
2004	no data	Nov 23	no data	Nov 30
2003	Apr 7	Nov 3	Mar 5	Nov 3
2002	no data	none	no data	none
2001	none	none	none	none
2000	no data	none	no data	none
1999	no data	none	no data	none
1998	none	none	none	none
1997	no data	none	no data	none
1996	none	none	none	none
1995	no data	Dec 18	no data	none
1992	no data	Dec 14	no data	Dec 15
1991	Mar 16	Nov 24	Feb 4	none
1990	Mar 14	Nov 27	Feb 15	Nov 28
1989	Mar 4	Nov 29	Feb 6	Nov 29
1988	Mar 14	Nov 20	Jan 21	Dec 5
1987	Feb 28	Nov 27	Feb 27	Dec 15
1986	Feb 10	Dec 1	Feb 10	Dec 2
1985	Mar 4	Nov 13	Feb 11	Nov 20
1984	Mar 6	Nov 26	Jan 20	Dec 17
1983	Feb 5	Nov 22	Jan 21	Nov 22
1982	Feb 7	Dec 16	Jan 23	Dec 17
1981	Feb 24	no data	Feb 6	no data
1980	no data	Nov 18	no data	Nov 18
1979	no data	Nov 21	no data	Nov 21
1978	Mar 25	Nov 16	none	Dec 7
1977	Mar 26	Nov 20	Mar 3	none
1976	Mar 4	Nov 27	Jan 27	Nov 29
1975	Mar 29	Nov 19	Mar 29	Nov 19
1974	Mar 7	no data	Feb 14	no data
1973	Feb 3	Nov 20	Feb 2	Dec 3
1972	Mar 28	Nov 24	Feb 12	Nov 24
1971	Mar 7	Oct 29	Mar 7	Oct 30
1970	Mar 10	Oct 29	Mar 10	Dec 19
1969	Mar 8	Nov 19	Feb 4	Nov 26
1968	Feb 7	Nov 27	Feb 1	Nov 28
1967	Mar 30	Dec 2	Feb 22	Dec 3
1966	Mar 20	Nov 25	Mar 18	Nov 25
1965	Apr 11	Nov 26	Apr 11	Dec 15
1964	Apr 24	Nov 14	Apr 24	Nov 14
1963	Mar 5	Dec 2	Jan 28	Dec 10
1962	Mar 15	Nov 18	Feb 28	Dec 12
1961	Mar 8	Nov 17	Jan 24	Nov 18
1960	Feb 25	Nov 20	Jan 20	Nov 28
1959	Feb 14	Nov 28	Jan 5	Nov 28
1958	Mar 4	Nov 17	Jan 23	Nov 17
1957	Feb 6	Nov 18	Feb 5	Nov 30
1956	Mar 16	Nov 1	Mar 13	Nov 21
1955	Apr 19	Nov 16	Feb 24	Nov 23
1954	Mar 26	Dec 1	Mar 13	Dec 17
1953	Apr 9	Nov 19	Mar 3	Dec 5
1952	Mar 23	Nov 11	Jan 11	Nov 24
1951	Mar 4	Nov 18	Mar 3	Dec 3

"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.