Frost history / Tucson 17 Nw, AZ
Tucson 17 Nw, AZ: frost dates by year
Last spring and first fall frost at NOAA station USC00028795, 1982 to 2023, measured from daily minimum temperatures.
Elevation 2,561 ft, 32.254, -111.196. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Feb 6 | Dec 2 |
| Earliest | Jan 5 (2015) | Nov 14 (1985) |
| Latest | Mar 14 (2006) | Dec 27 (2014) |
| Trend | 1.7 days later per decade | 1.6 days later per decade |
| Years with data | 21, 1 with no freeze | 24, 1 with no freeze |
At 28°F (hard freeze) the median last spring date is Feb 2 and the median first fall date is Dec 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 |
|---|---|---|---|---|
| 2023 | no data | none | no data | none |
| 2019 | no data | Dec 17 | no data | none |
| 2017 | Feb 25 | Dec 20 | Jan 28 | Dec 20 |
| 2016 | Feb 5 | no data | Feb 3 | no data |
| 2015 | Jan 5 | Nov 29 | Jan 3 | Dec 16 |
| 2014 | no data | Dec 27 | no data | Dec 29 |
| 2010 | no data | Nov 26 | no data | Nov 30 |
| 2008 | no data | Dec 11 | no data | Dec 27 |
| 2007 | Jan 24 | no data | Jan 22 | no data |
| 2006 | Mar 14 | no data | Mar 14 | no data |
| 2005 | Jan 13 | Nov 28 | none | Nov 28 |
| 2004 | Feb 24 | Nov 29 | Feb 13 | Nov 29 |
| 2003 | Feb 7 | Nov 23 | none | Dec 28 |
| 2002 | Mar 4 | Dec 19 | Feb 2 | none |
| 2001 | Feb 9 | Nov 28 | Jan 18 | none |
| 2000 | no data | Nov 17 | no data | none |
| 1999 | no data | Dec 4 | no data | none |
| 1994 | Feb 2 | no data | none | no data |
| 1993 | none | no data | none | no data |
| 1992 | Jan 15 | Nov 25 | none | Nov 25 |
| 1991 | Jan 31 | Dec 2 | none | none |
| 1990 | Mar 14 | Nov 28 | Feb 17 | Dec 23 |
| 1989 | Feb 7 | Dec 12 | Feb 7 | Dec 13 |
| 1988 | Jan 22 | Dec 20 | Jan 20 | Dec 26 |
| 1987 | Jan 22 | Dec 14 | Jan 22 | Dec 15 |
| 1986 | Feb 11 | Dec 11 | none | none |
| 1985 | Feb 7 | Nov 14 | Feb 7 | Dec 13 |
| 1983 | Jan 22 | Nov 23 | none | Nov 27 |
| 1982 | no data | Dec 25 | 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.