Frost history / Pinnacle Peak, AZ
Pinnacle Peak, AZ: frost dates by year
Last spring and first fall frost at NOAA station USC00026603, 2002 to 2025, measured from daily minimum temperatures.
Elevation 2,565 ft, 33.727, -111.861. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Feb 23 | Dec 18 |
| Earliest | Jan 12 (2024) | Nov 29 (2004) |
| Latest | Mar 13 (2006) | Dec 31 (2010) |
| Trend | 7.6 days earlier per decade | 5.5 days later per decade |
| Years with data | 18, 8 with no freeze | 20, 10 with no freeze |
At 28°F (hard freeze) the median last spring date is Feb 4 and the median first fall date is Dec 30.
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 | none | none | none | none |
| 2024 | Jan 12 | none | none | none |
| 2023 | Mar 2 | none | Feb 15 | none |
| 2022 | Feb 24 | Dec 14 | none | none |
| 2021 | Jan 27 | none | none | none |
| 2020 | no data | none | no data | none |
| 2019 | Feb 24 | Dec 29 | Feb 24 | none |
| 2018 | none | Dec 28 | none | none |
| 2017 | no data | none | no data | none |
| 2015 | no data | Dec 15 | no data | none |
| 2013 | Feb 21 | no data | Jan 15 | no data |
| 2012 | none | none | none | none |
| 2011 | Feb 27 | Dec 6 | Feb 4 | none |
| 2010 | none | Dec 31 | none | Dec 31 |
| 2009 | none | none | none | none |
| 2008 | Feb 21 | no data | none | no data |
| 2007 | Jan 22 | Dec 22 | Jan 15 | none |
| 2006 | Mar 13 | Nov 30 | none | none |
| 2005 | none | none | none | none |
| 2004 | none | Nov 29 | none | none |
| 2003 | none | Dec 28 | none | Dec 28 |
| 2002 | no data | none | no data | none |
"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.