Frost history / Ft Thomas 2 Sw, AZ
Ft Thomas 2 Sw, AZ: frost dates by year
Last spring and first fall frost at NOAA station USC00023150, 1967 to 2025, measured from daily minimum temperatures.
Elevation 2,835 ft, 33.009, -109.986. Download the data (JSON) · NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Apr 4 | Nov 4 |
| Earliest | Mar 6 (2004) | Oct 10 (1982) |
| Latest | May 8 (1979) | Nov 30 (2025) |
| Trend | 4.9 days earlier per decade | 1.1 days later per decade |
| Years with data | 39 | 41 |
At 28°F (hard freeze) the median last spring date is Mar 17 and the median first fall date is Nov 15.
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 30 | no data | Dec 4 |
| 2021 | Mar 28 | Oct 13 | Mar 18 | Nov 28 |
| 2020 | Apr 15 | Oct 28 | Mar 28 | Oct 28 |
| 2019 | no data | Oct 26 | no data | Oct 31 |
| 2016 | Mar 31 | Nov 18 | Mar 31 | Nov 18 |
| 2015 | no data | Nov 6 | no data | Nov 12 |
| 2014 | Mar 19 | Nov 4 | Feb 24 | Nov 17 |
| 2010 | no data | Nov 10 | no data | Nov 10 |
| 2009 | Apr 5 | no data | Mar 28 | no data |
| 2008 | Apr 19 | Oct 13 | Mar 7 | Oct 13 |
| 2007 | Mar 30 | Nov 25 | Mar 7 | Nov 25 |
| 2006 | Mar 22 | no data | Mar 14 | no data |
| 2005 | Mar 17 | Nov 17 | Mar 17 | Nov 19 |
| 2004 | Mar 6 | Nov 2 | Mar 2 | Nov 3 |
| 2003 | Apr 16 | Nov 4 | Feb 11 | Nov 24 |
| 2002 | Mar 20 | Nov 5 | Mar 20 | Nov 18 |
| 2001 | Apr 11 | Nov 24 | Mar 16 | Nov 24 |
| 2000 | Mar 13 | Nov 1 | Feb 27 | Nov 8 |
| 1999 | Apr 12 | Oct 21 | Apr 6 | Oct 21 |
| 1998 | Apr 27 | Nov 6 | Apr 7 | Nov 10 |
| 1997 | Mar 27 | Oct 25 | Mar 3 | Nov 30 |
| 1996 | Mar 30 | no data | Mar 2 | no data |
| 1994 | Mar 29 | Nov 5 | Mar 28 | Nov 18 |
| 1993 | Apr 15 | Oct 31 | Feb 3 | Nov 16 |
| 1992 | Mar 20 | Nov 5 | Mar 13 | Nov 7 |
| 1991 | Apr 29 | no data | Apr 13 | no data |
| 1990 | Mar 16 | Nov 5 | Mar 16 | Nov 27 |
| 1989 | Mar 22 | Oct 29 | Mar 5 | Oct 30 |
| 1988 | Apr 1 | Nov 16 | Mar 21 | Nov 16 |
| 1987 | Mar 31 | Nov 13 | Mar 31 | Nov 16 |
| 1986 | Mar 20 | Nov 8 | Feb 23 | Nov 8 |
| 1985 | Mar 31 | Nov 14 | Mar 31 | Nov 15 |
| 1984 | Apr 21 | Nov 10 | Mar 31 | Nov 27 |
| 1983 | Apr 16 | Nov 20 | Apr 15 | Nov 20 |
| 1982 | Apr 8 | Oct 10 | Mar 21 | Nov 5 |
| 1981 | Apr 5 | Oct 31 | Feb 6 | Oct 31 |
| 1980 | no data | Oct 17 | no data | Oct 17 |
| 1979 | May 8 | Oct 30 | Apr 12 | Oct 31 |
| 1978 | Apr 18 | Nov 17 | Feb 23 | Dec 3 |
| 1977 | Apr 4 | Nov 9 | Mar 21 | Nov 9 |
| 1976 | Apr 18 | Oct 29 | Mar 31 | Nov 14 |
| 1975 | no data | Oct 24 | no data | Nov 14 |
| 1971 | Apr 22 | Oct 27 | Mar 17 | Nov 23 |
| 1970 | Apr 30 | Oct 29 | Apr 30 | Oct 29 |
| 1969 | no data | Oct 31 | no data | Nov 17 |
| 1967 | May 1 | no data | Mar 8 | 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 1991–2020 frost probabilities.