Frost history / Fountain Hills, AZ
Fountain Hills, AZ: frost dates by year
Last spring and first fall frost at NOAA station USC00023190, 1980 to 2025, measured from daily minimum temperatures.
Elevation 1,580 ft, 33.603, -111.713. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Jan 31 | Dec 10 |
| Earliest | Jan 3 (2015) | Nov 20 (1994) |
| Latest | Mar 14 (1990) | Dec 28 (2003) |
| Trend | 5.5 days earlier per decade | 1.2 days later per decade |
| Years with data | 41, 14 with no freeze | 35, 13 with no freeze |
At 28°F (hard freeze) the median last spring date is Jan 20 and the median first fall date is Dec 24.
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 | Jan 13 | none | none | none |
| 2024 | Jan 12 | none | Jan 8 | none |
| 2023 | Jan 24 | none | none | none |
| 2022 | none | none | none | none |
| 2021 | none | none | none | none |
| 2020 | Feb 6 | none | none | none |
| 2019 | Feb 22 | no data | none | no data |
| 2015 | Jan 3 | no data | Jan 3 | no data |
| 2014 | none | Dec 26 | none | none |
| 2013 | Jan 16 | no data | Jan 15 | no data |
| 2012 | none | none | none | none |
| 2011 | Feb 5 | none | Feb 4 | none |
| 2010 | none | Nov 30 | none | Dec 31 |
| 2009 | none | none | none | none |
| 2007 | Jan 15 | no data | Jan 15 | no data |
| 2005 | none | Dec 9 | none | none |
| 2004 | none | Nov 30 | none | none |
| 2003 | Feb 6 | Dec 28 | none | none |
| 2002 | none | none | none | none |
| 2001 | Jan 18 | none | none | none |
| 2000 | Jan 10 | no data | none | no data |
| 1999 | none | none | none | none |
| 1998 | none | Dec 7 | none | Dec 24 |
| 1997 | Feb 7 | Dec 28 | Jan 9 | none |
| 1996 | Jan 26 | Nov 30 | Jan 26 | Dec 18 |
| 1995 | none | Dec 22 | none | none |
| 1994 | Jan 31 | Nov 20 | Jan 10 | none |
| 1993 | none | Dec 16 | none | Dec 23 |
| 1992 | Jan 23 | Nov 21 | none | Dec 16 |
| 1991 | Jan 31 | Dec 2 | Jan 30 | none |
| 1990 | Mar 14 | Dec 18 | Feb 17 | Dec 23 |
| 1989 | Feb 15 | Dec 15 | Feb 15 | none |
| 1988 | Mar 12 | Dec 26 | none | Dec 28 |
| 1987 | Jan 25 | Dec 14 | Jan 20 | Dec 26 |
| 1986 | Feb 11 | Dec 11 | none | none |
| 1985 | Mar 5 | Dec 10 | Feb 2 | none |
| 1984 | Feb 18 | Nov 26 | none | none |
| 1983 | Jan 23 | Nov 26 | none | none |
| 1982 | Feb 4 | Dec 28 | none | none |
| 1981 | Feb 1 | none | none | none |
| 1980 | none | no data | none | no data |
"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.