Frost history / Green Valley, AZ
Green Valley, AZ: frost dates by year
Last spring and first fall frost at NOAA station USC00023668, 1998 to 2025, measured from daily minimum temperatures.
Elevation 2,900 ft, 31.893, -110.998. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Mar 1 | Nov 28 |
| Earliest | Jan 13 (2005) | Oct 27 (2020) |
| Latest | Apr 6 (2023) | Dec 21 (2008) |
| Trend | little change (less than half a day per decade) | 1.8 days earlier per decade |
| Years with data | 23 | 26, 1 with no freeze |
At 28°F (hard freeze) the median last spring date is Feb 7 and the median first fall date is Dec 14.
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 | Feb 1 | none | Jan 22 | none |
| 2024 | Feb 13 | Nov 8 | Jan 13 | Dec 12 |
| 2023 | Apr 6 | Dec 10 | Feb 18 | none |
| 2022 | Mar 9 | Nov 26 | Feb 6 | Dec 15 |
| 2021 | Mar 18 | Dec 19 | Mar 1 | none |
| 2020 | Feb 28 | Oct 27 | Feb 7 | Dec 16 |
| 2019 | Feb 25 | Dec 17 | Feb 25 | Dec 29 |
| 2018 | Mar 1 | Nov 15 | Jan 24 | Dec 29 |
| 2017 | no data | Dec 9 | no data | Dec 22 |
| 2016 | no data | Nov 30 | no data | Nov 30 |
| 2015 | Jan 25 | Nov 12 | Jan 4 | Nov 30 |
| 2014 | Feb 2 | Nov 24 | none | Dec 28 |
| 2013 | Mar 1 | Dec 6 | Feb 25 | Dec 7 |
| 2012 | Mar 20 | Nov 12 | none | Dec 20 |
| 2011 | Mar 1 | Dec 5 | Feb 28 | Dec 5 |
| 2010 | no data | Nov 26 | no data | Nov 26 |
| 2009 | Feb 19 | no data | none | no data |
| 2008 | no data | Dec 21 | no data | Dec 27 |
| 2007 | Mar 3 | Dec 15 | Feb 4 | Dec 15 |
| 2006 | Mar 13 | no data | Jan 24 | no data |
| 2005 | Jan 13 | Nov 28 | none | Nov 28 |
| 2004 | Feb 14 | Nov 30 | Feb 14 | Nov 30 |
| 2003 | Feb 10 | Nov 23 | Feb 6 | Dec 18 |
| 2002 | Mar 5 | Dec 19 | Mar 4 | Dec 19 |
| 2001 | Feb 16 | Nov 27 | Feb 10 | Dec 13 |
| 2000 | Mar 7 | Nov 8 | Jan 5 | none |
| 1999 | Apr 5 | Nov 23 | Feb 11 | Dec 5 |
| 1998 | no data | Dec 7 | no data | Dec 7 |
"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.