Frost history / Casa Grande, AZ
Casa Grande, AZ: frost dates by year
Last spring and first fall frost at NOAA station USC00021306, 1951 to 2025, measured from daily minimum temperatures.
Elevation 1,400 ft, 32.888, -111.715. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Feb 23 | Nov 28 |
| Earliest | Jan 9 (1998) | Oct 25 (1975) |
| Latest | Apr 11 (1979) | Dec 29 (1962) |
| Trend | 2.6 days earlier per decade | 1.5 days later per decade |
| Years with data | 56 | 51, 2 with no freeze |
At 28°F (hard freeze) the median last spring date is Feb 6 and the median first fall date is Dec 7.
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 31 | none | Jan 22 | none |
| 2024 | Jan 15 | none | Jan 13 | none |
| 2023 | Apr 5 | Dec 14 | Feb 16 | none |
| 2022 | Feb 24 | no data | Feb 6 | no data |
| 2021 | Mar 3 | Dec 16 | none | none |
| 2020 | Feb 7 | Nov 11 | Feb 6 | Dec 16 |
| 2009 | Feb 11 | no data | none | no data |
| 2008 | Feb 6 | no data | Jan 18 | no data |
| 2007 | Mar 2 | Dec 15 | Jan 23 | Dec 22 |
| 2006 | Feb 23 | Nov 30 | Jan 23 | Nov 30 |
| 2005 | Jan 15 | Nov 28 | none | Dec 5 |
| 2004 | Feb 15 | no data | Feb 6 | no data |
| 2003 | Feb 10 | Nov 23 | Feb 10 | Nov 23 |
| 2002 | Mar 17 | Dec 19 | Mar 3 | Dec 19 |
| 2001 | Feb 17 | Nov 27 | Jan 19 | Nov 27 |
| 1999 | Jan 29 | no data | none | no data |
| 1998 | Jan 9 | Dec 6 | none | Dec 27 |
| 1997 | no data | Dec 13 | no data | Dec 27 |
| 1995 | no data | Dec 23 | no data | none |
| 1994 | Feb 6 | Nov 20 | Feb 1 | none |
| 1993 | Jan 12 | Nov 26 | none | Dec 22 |
| 1992 | Jan 23 | Nov 25 | none | Nov 29 |
| 1991 | no data | Dec 2 | no data | none |
| 1990 | Mar 14 | no data | Feb 16 | no data |
| 1989 | Feb 7 | Dec 12 | Jan 9 | Dec 12 |
| 1988 | Mar 12 | Nov 30 | Jan 21 | Dec 27 |
| 1987 | Jan 22 | Dec 14 | Jan 22 | Dec 15 |
| 1986 | Feb 11 | Dec 11 | Feb 11 | none |
| 1985 | Mar 4 | Nov 14 | Mar 3 | Nov 20 |
| 1984 | no data | Nov 26 | no data | Nov 27 |
| 1983 | Apr 5 | Nov 22 | Jan 23 | Nov 27 |
| 1982 | Mar 7 | Oct 29 | Feb 3 | Dec 4 |
| 1981 | Feb 8 | no data | Feb 2 | no data |
| 1980 | Feb 15 | Nov 25 | Feb 11 | Nov 27 |
| 1979 | Apr 11 | Nov 12 | Feb 6 | Nov 20 |
| 1977 | Apr 4 | no data | Mar 18 | no data |
| 1976 | Mar 5 | Nov 28 | Jan 11 | Nov 28 |
| 1975 | Mar 29 | Oct 25 | Feb 23 | Dec 16 |
| 1974 | Mar 10 | Nov 27 | Feb 23 | Dec 10 |
| 1973 | Feb 2 | Nov 15 | Jan 21 | Dec 4 |
| 1972 | Feb 14 | no data | Feb 3 | no data |
| 1970 | Feb 3 | Dec 12 | Jan 6 | none |
| 1969 | Mar 8 | Dec 6 | Feb 3 | none |
| 1968 | Feb 1 | Nov 26 | Jan 4 | Dec 13 |
| 1967 | Mar 8 | Dec 2 | Feb 17 | Dec 10 |
| 1966 | Mar 5 | Dec 10 | Mar 4 | Dec 28 |
| 1965 | Mar 5 | Nov 29 | Feb 14 | none |
| 1964 | Mar 9 | Nov 17 | Feb 16 | Dec 16 |
| 1963 | Jan 28 | Dec 8 | Jan 21 | Dec 14 |
| 1962 | Mar 15 | Dec 29 | Feb 28 | none |
| 1961 | Feb 25 | Nov 22 | none | none |
| 1960 | Feb 26 | Nov 28 | Feb 25 | Dec 6 |
| 1959 | Feb 5 | Dec 15 | Feb 4 | none |
| 1958 | Mar 10 | Nov 17 | Jan 23 | Nov 18 |
| 1957 | Feb 2 | Nov 23 | none | Dec 3 |
| 1956 | no data | Nov 3 | no data | Nov 4 |
| 1955 | Mar 22 | no data | Mar 22 | no data |
| 1954 | Mar 14 | Nov 18 | Mar 13 | Dec 12 |
| 1953 | Feb 25 | Nov 19 | none | Nov 22 |
| 1952 | Feb 19 | Nov 25 | Feb 14 | none |
| 1951 | Mar 4 | Dec 8 | Mar 4 | Dec 8 |
"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.