Frost history / Scappoose Ind Ap, OR
Scappoose Ind Ap, OR: frost dates by year
Last spring and first fall frost at NOAA station USW00004201, 1999 to 2023, measured from daily minimum temperatures.
Elevation 55 ft, 45.773, -122.861. Download the data (JSON) · NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Apr 15 | Nov 2 |
| Earliest | Mar 11 (2019) | Oct 10 (2019) |
| Latest | May 10 (2012) | Dec 6 (2016) |
| Trend | 6.0 days earlier per decade | 4.2 days later per decade |
| Years with data | 25 | 25 |
At 28°F (hard freeze) the median last spring date is Mar 4 and the median first fall date is Nov 21.
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 | Apr 20 | Oct 28 | Mar 1 | Nov 25 |
| 2022 | Apr 15 | Nov 10 | Mar 10 | Nov 14 |
| 2021 | Apr 11 | Nov 17 | Mar 16 | Dec 27 |
| 2020 | Apr 13 | Oct 25 | Mar 16 | Oct 25 |
| 2019 | Mar 11 | Oct 10 | Mar 11 | Oct 29 |
| 2018 | Apr 3 | Nov 8 | Mar 10 | Nov 9 |
| 2017 | Apr 3 | Oct 31 | Feb 23 | Dec 8 |
| 2016 | Mar 28 | Dec 6 | Jan 8 | Dec 6 |
| 2015 | Apr 15 | Nov 16 | Mar 4 | Nov 22 |
| 2014 | Mar 31 | Nov 11 | Feb 8 | Nov 11 |
| 2013 | Apr 17 | Oct 29 | Mar 4 | Nov 21 |
| 2012 | May 10 | Nov 9 | Apr 7 | Dec 30 |
| 2011 | May 1 | Oct 26 | Mar 7 | Nov 2 |
| 2010 | May 6 | Nov 21 | Feb 22 | Nov 21 |
| 2009 | Apr 24 | Nov 2 | Apr 4 | Dec 3 |
| 2008 | Apr 20 | Oct 11 | Feb 18 | Dec 5 |
| 2007 | Apr 3 | Oct 25 | Jan 31 | Nov 23 |
| 2006 | May 9 | Oct 29 | Mar 19 | Oct 31 |
| 2005 | Apr 14 | Nov 7 | Feb 23 | Nov 15 |
| 2004 | Apr 1 | Nov 4 | Feb 11 | Nov 21 |
| 2003 | Apr 5 | Oct 31 | Feb 26 | Oct 31 |
| 2002 | May 8 | Oct 12 | Mar 18 | Oct 30 |
| 2001 | Apr 15 | Nov 7 | Feb 28 | Nov 7 |
| 2000 | Apr 24 | Nov 10 | Feb 19 | Nov 10 |
| 1999 | Apr 14 | Oct 15 | Mar 11 | Dec 24 |
"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.