Campo Asos, CA: frost dates by year

Last spring and first fall frost at NOAA station USW00003164, 1998 to 2020, measured from daily minimum temperatures.

Elevation 2,641 ft, 32.626, -116.468. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	May 8	Oct 29
Earliest	Apr 3 (2020)	Sep 30 (2019)
Latest	Jun 4 (2011)	Nov 11 (2018)
Trend	3.8 days earlier per decade	6.2 days later per decade
Years with data	22	18

At 28°F (hard freeze) the median last spring date is Apr 2 and the median first fall date is Nov 28.

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
2020	Apr 3	no data	Feb 15	no data
2019	May 5	Sep 30	Feb 23	Dec 18
2018	May 14	Nov 11	Mar 2	Dec 28
2017	Apr 15	Nov 11	Feb 25	Dec 4
2016	May 22	Nov 1	Feb 2	Nov 30
2015	May 13	Nov 10	Feb 10	Nov 11
2014	Apr 6	Nov 3	Mar 31	Dec 26
2013	May 24	Oct 30	Feb 26	Dec 12
2012	Apr 15	Nov 2	Apr 6	Dec 12
2011	Jun 4	Oct 27	Apr 10	Dec 4
2010	May 29	no data	May 24	no data
2009	Apr 30	no data	Apr 4	no data
2008	May 4	Oct 11	Apr 21	Oct 12
2007	May 12	no data	Apr 19	no data
2006	Apr 25	Oct 7	Mar 22	Oct 30
2005	May 11	Nov 4	Apr 20	Nov 28
2004	Apr 20	Oct 29	Feb 25	Nov 23
2003	May 10	no data	May 10	no data
2002	May 23	Oct 25	Apr 21	Oct 25
2001	Apr 29	Oct 7	Apr 14	Nov 27
2000	Apr 17	Oct 12	Mar 22	Nov 5
1999	May 20	Nov 8	Apr 11	Nov 18
1998	no data	Oct 14	no data	Nov 2

"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.