Frost history / Aurora State Ap, OR
Aurora State Ap, OR: frost dates by year
Last spring and first fall frost at NOAA station USW00094281, 1997 to 2024, measured from daily minimum temperatures.
Elevation 196 ft, 45.249, -122.769. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Mar 22 | Nov 6 |
| Earliest | Feb 13 (2004) | Oct 11 (2019) |
| Latest | Apr 24 (2000) | Dec 8 (1998) |
| Trend | 3.2 days earlier per decade | 2.6 days earlier per decade |
| Years with data | 27 | 28 |
At 28°F (hard freeze) the median last spring date is Feb 20 and the median first fall date is Nov 26.
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 |
|---|---|---|---|---|
| 2024 | Mar 8 | Oct 24 | Mar 6 | Dec 3 |
| 2023 | Mar 27 | Oct 29 | Feb 25 | Nov 26 |
| 2022 | Apr 15 | Nov 9 | Feb 25 | Nov 16 |
| 2021 | Apr 11 | Nov 21 | Jan 23 | Dec 27 |
| 2020 | Mar 22 | Oct 26 | Feb 4 | Oct 26 |
| 2019 | Mar 11 | Oct 11 | Mar 5 | Oct 31 |
| 2018 | Mar 20 | Nov 9 | Feb 23 | Dec 5 |
| 2017 | Feb 25 | Dec 7 | Jan 24 | Dec 8 |
| 2016 | Feb 21 | Dec 6 | Jan 3 | Dec 7 |
| 2015 | Mar 5 | Nov 4 | Jan 2 | Nov 21 |
| 2014 | Mar 20 | Nov 13 | Feb 8 | Nov 15 |
| 2013 | Mar 22 | Oct 30 | Jan 22 | Nov 22 |
| 2012 | Mar 23 | Nov 22 | Mar 7 | Dec 30 |
| 2011 | Apr 12 | Oct 26 | Feb 26 | Dec 3 |
| 2010 | Mar 14 | Nov 21 | none | Nov 23 |
| 2009 | Apr 4 | Nov 14 | Feb 27 | Dec 4 |
| 2008 | Apr 3 | Oct 22 | Jan 26 | Dec 14 |
| 2007 | Apr 1 | Oct 31 | Feb 3 | Nov 26 |
| 2006 | Mar 20 | Oct 30 | Feb 24 | Nov 1 |
| 2005 | Mar 17 | Nov 7 | Feb 17 | Nov 20 |
| 2004 | Feb 13 | Nov 5 | Feb 13 | Nov 21 |
| 2003 | Mar 24 | Oct 31 | Feb 26 | Nov 1 |
| 2002 | Mar 8 | Nov 2 | Mar 1 | Nov 2 |
| 2001 | Apr 4 | Nov 7 | Feb 28 | Dec 24 |
| 2000 | Apr 24 | Nov 11 | Jan 29 | Nov 12 |
| 1999 | Apr 2 | Dec 4 | Jan 5 | Dec 24 |
| 1998 | Mar 29 | Dec 8 | Mar 7 | Dec 9 |
| 1997 | no data | Oct 25 | no data | Dec 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.