Willcox, AZ: frost dates by year

Last spring and first fall frost at NOAA station USC00029334, 1951 to 2025, measured from daily minimum temperatures.

Elevation 4,170 ft, 32.255, -109.837. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Apr 21	Oct 29
Earliest	Mar 6 (2004)	Sep 21 (1965)
Latest	Jun 13 (1964)	Nov 25 (2007)
Trend	4.0 days earlier per decade	1.7 days later per decade
Years with data	69	70

At 28°F (hard freeze) the median last spring date is Apr 5 and the median first fall date is Nov 4.

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 21	Nov 14	Apr 21	Dec 6
2024	no data	Oct 31	no data	Nov 7
2023	Apr 6	Nov 3	Apr 6	Nov 21
2022	Apr 14	Oct 25	Mar 24	Oct 26
2021	May 1	Oct 29	Apr 30	Nov 18
2020	Mar 29	Oct 28	Mar 29	Oct 28
2019	Apr 13	Oct 26	Mar 14	Oct 31
2018	Mar 28	Nov 11	Mar 20	Nov 15
2017	Apr 6	Oct 8	Mar 10	Nov 20
2016	Apr 3	Nov 13	Mar 24	Nov 16
2015	May 10	Oct 31	Mar 10	Nov 3
2014	Mar 18	Nov 4	Feb 22	Nov 5
2013	Apr 20	Oct 20	Mar 16	Oct 31
2012	Apr 16	Oct 25	Apr 15	Oct 31
2011	May 1	Oct 8	Apr 11	Nov 8
2010	May 3	Nov 6	May 1	Nov 10
2009	Apr 18	Oct 29	Feb 22	Oct 29
2008	no data	Oct 13	no data	Nov 8
2007	Apr 22	Nov 25	Mar 29	Nov 25
2004	Mar 6	Nov 2	Mar 1	Nov 3
2003	Apr 16	Nov 4	Mar 7	Nov 5
2002	Apr 21	Oct 4	Mar 20	Oct 4
2001	Apr 13	Nov 22	Mar 18	Nov 24
2000	Apr 1	Oct 31	Apr 1	Nov 9
1999	Apr 11	Oct 31	Apr 10	Nov 23
1998	May 15	Nov 3	Apr 17	Nov 10
1997	Apr 25	no data	Apr 4	no data
1996	Apr 20	Oct 22	Mar 30	Oct 23
1995	Apr 23	Oct 25	Apr 20	Nov 19
1994	Apr 28	Oct 17	Apr 28	Nov 5
1993	Apr 15	Oct 31	Mar 28	Oct 31
1992	Mar 25	Nov 2	Feb 28	Nov 6
1991	Apr 29	Oct 29	Apr 29	Oct 29
1990	Mar 30	Oct 22	Mar 17	Nov 4
1989	Apr 28	Oct 27	Mar 6	Oct 29
1988	May 7	Nov 13	Apr 3	Nov 16
1987	Apr 14	Nov 7	Mar 31	Nov 13
1986	May 9	Nov 6	Mar 20	Nov 8
1985	Apr 2	Nov 7	Mar 31	Nov 14
1984	Apr 30	Nov 2	Apr 21	Nov 3
1983	Apr 16	Nov 16	Apr 14	Nov 20
1982	Apr 8	Oct 11	Mar 24	Oct 28
1981	Apr 4	Oct 17	Mar 15	Nov 3
1980	Apr 15	Oct 17	Apr 14	Nov 2
1979	May 10	Oct 31	Apr 5	Oct 31
1978	Apr 18	Nov 16	Apr 10	Nov 17
1977	Apr 21	Nov 9	Apr 4	Nov 9
1976	Apr 18	Oct 10	Apr 17	Oct 29
1975	May 7	Oct 14	May 7	Nov 2
1974	Apr 14	Oct 31	Apr 4	Nov 4
1973	Apr 17	Oct 11	Apr 9	Oct 31
1972	Apr 29	Oct 31	Apr 21	Nov 1
1970	May 9	Oct 9	May 1	Oct 9
1969	May 7	Oct 12	Apr 28	Oct 13
1968	Jun 10	Oct 5	Apr 25	Oct 16
1967	May 14	Oct 20	May 14	Oct 20
1966	May 12	Oct 16	Apr 22	Oct 16
1965	May 13	Sep 21	May 10	Oct 17
1964	Jun 13	Oct 22	May 9	Nov 1
1963	May 13	Nov 3	Apr 29	Nov 5
1962	May 29	Oct 7	May 22	Nov 2
1961	May 6	Oct 10	Apr 28	Oct 17
1960	Apr 30	Oct 29	Apr 26	Oct 30
1959	May 6	Oct 4	Mar 28	Nov 7
1957	May 13	Nov 6	Apr 23	Nov 7
1956	Apr 16	Oct 25	Apr 6	Oct 25
1955	May 4	Oct 28	Apr 20	Nov 9
1954	Apr 3	Oct 26	Mar 28	Nov 3
1953	May 17	Oct 7	May 10	Oct 25
1952	Apr 4	Nov 5	Mar 26	Nov 5
1951	May 15	Nov 3	Mar 29	Nov 19

"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.