Natural Brg, AZ: frost dates by year

Last spring and first fall frost at NOAA station USC00025825, 1951 to 2025, measured from daily minimum temperatures.

Elevation 4,608 ft, 34.322, -111.453. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Apr 17	Nov 2
Earliest	Mar 29 (2007)	Sep 25 (2017)
Latest	May 22 (2016)	Dec 1 (2025)
Trend	1.4 days earlier per decade	1.1 days earlier per decade
Years with data	33	34

At 28°F (hard freeze) the median last spring date is Apr 2 and the median first fall date is Nov 17.

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	no data	Dec 1	no data	Dec 4
2024	Apr 7	Oct 30	Apr 7	Nov 7
2023	Apr 5	Oct 31	Apr 5	Dec 9
2022	Apr 13	Oct 28	Apr 13	Nov 4
2021	Mar 29	Oct 13	Mar 17	Dec 11
2020	Mar 29	Oct 27	Mar 29	Oct 27
2019	Apr 13	Oct 26	Mar 15	Oct 30
2018	May 2	Oct 8	May 2	Oct 8
2017	May 16	Sep 25	Mar 31	Dec 9
2016	May 22	Nov 23	Mar 28	Nov 29
2015	Apr 9	Nov 5	Mar 6	Nov 11
2014	Apr 3	Nov 17	Apr 3	Nov 17
2013	Apr 19	Oct 17	Feb 28	Nov 6
2012	no data	Nov 11	no data	Nov 11
2010	May 3	no data	Apr 30	no data
2009	Apr 17	no data	Apr 17	no data
2008	Apr 17	Oct 12	Mar 18	Oct 12
2007	Mar 29	Nov 25	Mar 4	Nov 25
2006	Apr 6	Oct 27	Mar 22	Nov 30
2005	Apr 6	Nov 16	Mar 26	Nov 27
1969	Apr 27	Oct 12	Mar 16	Nov 19
1968	Apr 23	Nov 16	Apr 20	Nov 27
1967	May 1	Nov 29	Apr 30	Nov 30
1966	May 12	Nov 9	Apr 13	Nov 26
1965	May 8	Nov 14	May 8	Nov 26
1964	May 8	Nov 4	Apr 20	Nov 14
1963	Apr 27	Nov 17	Apr 22	Dec 8
1962	Mar 31	Nov 17	Mar 24	Nov 17
1961	Apr 25	Oct 29	Apr 11	Oct 29
1960	Apr 29	Nov 15	Apr 24	Nov 15
1959	May 5	Oct 30	Mar 12	Nov 6
1957	Apr 22	no data	Apr 2	no data
1956	Apr 15	Oct 25	Apr 3	Nov 2
1955	no data	Nov 9	no data	Nov 16
1954	Mar 31	Oct 25	Mar 26	Dec 11
1952	Apr 11	Nov 10	Apr 1	Nov 10
1951	no data	Oct 27	no data	Nov 18

"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.