Nogales 6 N, AZ: frost dates by year

Last spring and first fall frost at NOAA station USC00025924, 1953 to 2025, measured from daily minimum temperatures.

Elevation 3,461 ft, 31.455, -110.968. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Apr 24	Oct 30
Earliest	Mar 6 (2004)	Sep 21 (1965)
Latest	May 28 (1975)	Dec 7 (2017)
Trend	3.0 days earlier per decade	1.3 days later per decade
Years with data	65	63

At 28°F (hard freeze) the median last spring date is Apr 4 and the median first fall date is Nov 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	Apr 20	Nov 20	Apr 5	Dec 8
2024	Apr 16	Oct 19	Apr 7	Nov 5
2023	no data	Nov 9	no data	Nov 10
2022	May 13	Oct 25	Apr 14	Nov 4
2021	Mar 31	Oct 13	Mar 25	Dec 5
2020	Apr 15	Oct 27	Mar 29	Oct 27
2019	Apr 13	Oct 29	Mar 16	Dec 12
2018	May 3	Nov 11	Apr 14	Nov 12
2017	Apr 10	Dec 7	Mar 7	Dec 8
2016	Apr 17	Nov 14	Apr 1	Nov 18
2015	Apr 17	no data	Mar 5	no data
2014	Apr 7	Nov 4	Feb 12	Nov 4
2013	Apr 20	Oct 17	Apr 18	Oct 31
2012	Apr 16	Nov 11	Apr 15	Nov 11
2011	May 2	Nov 8	Feb 28	Nov 8
2010	no data	Nov 9	no data	Nov 11
2009	Apr 18	Oct 29	Mar 28	Oct 29
2008	no data	Oct 13	no data	Oct 13
2006	Mar 23	no data	Mar 21	no data
2005	Apr 11	no data	Mar 17	no data
2004	Mar 6	Nov 2	Mar 1	Nov 2
2003	Apr 25	Nov 4	Apr 6	Nov 5
2002	Apr 21	Oct 19	Mar 25	Nov 5
2001	Apr 23	Nov 5	Apr 11	Nov 24
2000	Apr 2	Nov 1	Mar 21	Nov 8
1999	Apr 29	Oct 31	Apr 9	Nov 21
1997	Apr 24	no data	Mar 5	no data
1996	Apr 20	Oct 23	Mar 3	Oct 29
1995	Apr 23	Oct 25	Apr 11	Nov 28
1994	Apr 28	Oct 17	Feb 24	Nov 5
1993	Apr 15	Oct 20	Mar 6	Nov 16
1992	Mar 25	Nov 2	Feb 25	Nov 6
1991	May 5	Oct 28	Apr 16	Oct 29
1990	Mar 19	Oct 21	Mar 17	Nov 4
1989	Apr 28	Oct 27	Mar 5	Oct 29
1988	May 3	Nov 15	Apr 3	Nov 16
1987	Apr 5	Nov 8	Mar 29	Nov 12
1986	May 8	Oct 21	Apr 4	Nov 23
1985	May 1	Nov 7	Mar 31	Nov 14
1984	Apr 30	no data	Apr 21	no data
1983	May 3	Nov 15	Apr 13	Nov 20
1982	Apr 23	Oct 9	Mar 24	Oct 11
1981	Apr 9	Oct 17	Apr 4	Oct 31
1980	May 27	Oct 18	May 27	Nov 18
1979	May 11	Oct 24	Apr 11	Oct 31
1978	Apr 22	Nov 16	Apr 18	Nov 16
1977	May 20	Nov 8	Apr 12	Nov 24
1976	Apr 18	Oct 25	Apr 17	Oct 29
1975	May 28	no data	May 8	no data
1974	May 2	Oct 31	Mar 31	Oct 31
1973	May 1	Nov 12	Apr 19	Nov 12
1972	Apr 22	Nov 13	Apr 15	Nov 13
1971	May 23	Oct 19	Apr 20	Oct 30
1970	May 1	Oct 8	Apr 30	Oct 27
1969	Apr 27	Oct 30	Mar 26	Nov 18
1968	Apr 24	Oct 16	Apr 23	Nov 7
1967	May 3	Oct 28	May 2	Oct 31
1966	no data	Oct 17	no data	Nov 2
1965	May 9	Sep 21	May 8	Nov 29
1964	May 9	Nov 3	May 8	Nov 12
1963	Apr 28	Nov 6	Apr 19	Nov 22
1962	May 22	Nov 18	Mar 25	Nov 18
1961	Apr 28	Oct 30	Mar 31	Nov 13
1960	Apr 30	Nov 1	Apr 25	Nov 9
1959	May 5	Oct 4	Mar 26	Nov 7
1958	Apr 14	Oct 31	Apr 6	Oct 31
1957	Apr 24	Nov 7	Apr 23	Nov 7
1956	no data	Oct 25	no data	Oct 30
1954	Mar 27	no data	Mar 14	no data
1953	May 17	Oct 21	Apr 12	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.