Oracle Sp, AZ: frost dates by year

Last spring and first fall frost at NOAA station USC00026117, 2010 to 2025, measured from daily minimum temperatures.

Elevation 4,595 ft, 32.610, -110.732. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Apr 6	Nov 6
Earliest	Mar 5 (2015)	Oct 13 (2021)
Latest	May 4 (2018)	Dec 8 (2017)
Trend	8.1 days earlier per decade	3.1 days earlier per decade
Years with data	14	15

At 28°F (hard freeze) the median last spring date is Mar 12 and the median first fall date is Nov 11.

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	Nov 21	no data	Dec 4
2024	Apr 7	Nov 5	Apr 7	Nov 7
2023	Apr 6	Nov 10	Apr 5	Dec 14
2022	Apr 14	Oct 25	Mar 12	Nov 1
2021	Mar 26	Oct 13	Mar 18	Oct 13
2020	Apr 10	Oct 27	Feb 27	Oct 27
2019	Mar 15	Oct 31	Mar 15	Oct 31
2018	May 4	no data	May 4	no data
2017	Apr 2	Dec 8	Mar 7	Dec 8
2016	Mar 31	Nov 18	Feb 7	Nov 18
2015	Mar 5	Nov 6	Mar 5	Nov 28
2014	Apr 4	Nov 3	Feb 6	Nov 17
2013	Apr 19	Oct 31	Apr 19	Nov 25
2012	Apr 15	Nov 11	Mar 12	Nov 11
2011	May 2	Nov 7	Mar 10	Nov 8
2010	no data	Nov 10	no data	Nov 10

"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.