Frost history / Pleasant Valley, AZ
Pleasant Valley, AZ: frost dates by year
Last spring and first fall frost at NOAA station USC00026653, 1965 to 2025, measured from daily minimum temperatures.
Elevation 5,183 ft, 34.100, -110.966. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 27 | Oct 10 |
| Earliest | Apr 16 (2020) | Sep 1 (1980) |
| Latest | Jun 27 (1965) | Nov 9 (1983) |
| Trend | 6.2 days earlier per decade | 2.0 days later per decade |
| Years with data | 44 | 47 |
At 28°F (hard freeze) the median last spring date is May 12 and the median first fall date is Oct 16.
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 | Oct 30 | no data | Nov 23 |
| 2023 | no data | Oct 14 | no data | Nov 3 |
| 2022 | May 13 | Oct 24 | May 12 | Oct 24 |
| 2021 | no data | Oct 11 | no data | Oct 13 |
| 2020 | Apr 16 | Oct 28 | Apr 10 | Oct 28 |
| 2019 | no data | Oct 21 | no data | Oct 29 |
| 2018 | May 3 | Oct 31 | Mar 28 | Nov 11 |
| 2017 | Apr 30 | Sep 24 | Apr 1 | Nov 18 |
| 2016 | May 8 | Sep 24 | Apr 26 | Oct 5 |
| 2013 | May 10 | Sep 22 | Apr 22 | Oct 9 |
| 2012 | May 29 | Oct 15 | May 29 | Oct 23 |
| 2011 | no data | Oct 8 | no data | Oct 9 |
| 2010 | May 25 | no data | May 25 | no data |
| 2009 | no data | Oct 1 | no data | Oct 2 |
| 2007 | May 5 | no data | May 5 | no data |
| 2006 | no data | Sep 19 | no data | Oct 18 |
| 2005 | May 12 | no data | May 12 | no data |
| 2001 | May 7 | Oct 11 | May 7 | Oct 11 |
| 1999 | Jun 5 | no data | May 5 | no data |
| 1998 | May 23 | no data | May 16 | no data |
| 1997 | May 5 | Oct 8 | May 2 | Oct 12 |
| 1996 | May 27 | Oct 20 | Apr 22 | Oct 21 |
| 1995 | Jun 18 | Oct 5 | May 8 | Oct 6 |
| 1994 | May 21 | Oct 6 | May 21 | Oct 10 |
| 1993 | Jun 8 | Oct 19 | Jun 7 | Oct 28 |
| 1992 | Apr 27 | Oct 8 | Apr 21 | Oct 8 |
| 1991 | May 29 | Oct 26 | May 12 | Oct 29 |
| 1990 | May 20 | Oct 10 | Mar 28 | Oct 10 |
| 1989 | May 31 | Oct 26 | May 12 | Oct 26 |
| 1988 | May 31 | Nov 5 | May 8 | Nov 12 |
| 1987 | May 29 | Oct 20 | May 27 | Nov 11 |
| 1986 | May 14 | Oct 13 | May 9 | Oct 14 |
| 1985 | May 15 | Sep 12 | May 14 | Nov 2 |
| 1984 | May 8 | Oct 16 | May 1 | Oct 16 |
| 1983 | May 19 | Nov 9 | May 17 | Nov 9 |
| 1982 | Jun 9 | Sep 30 | Apr 22 | Oct 1 |
| 1981 | May 26 | Oct 16 | May 23 | Oct 25 |
| 1980 | Jun 15 | Sep 1 | Jun 2 | Sep 21 |
| 1979 | Jun 19 | Oct 22 | May 12 | Oct 22 |
| 1978 | no data | Sep 24 | no data | Oct 27 |
| 1977 | May 27 | Oct 17 | May 20 | Oct 21 |
| 1976 | Jun 12 | Oct 8 | Jun 12 | Oct 9 |
| 1975 | May 29 | Oct 9 | May 29 | Oct 13 |
| 1974 | May 29 | Oct 15 | May 20 | Nov 4 |
| 1973 | no data | Oct 8 | no data | Oct 9 |
| 1972 | May 27 | no data | May 22 | no data |
| 1971 | Jun 6 | Sep 20 | Jun 3 | Oct 19 |
| 1970 | Jun 16 | Sep 23 | May 9 | Oct 8 |
| 1969 | May 7 | Oct 5 | May 1 | Oct 5 |
| 1968 | Jun 10 | Sep 18 | May 18 | Sep 24 |
| 1967 | Jun 11 | Oct 8 | May 13 | Oct 8 |
| 1966 | Jun 3 | Oct 14 | Apr 24 | Oct 14 |
| 1965 | Jun 27 | Sep 21 | May 23 | Sep 21 |
"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.