Frost history / Portland Kgw-Tv, OR
Portland Kgw-Tv, OR: frost dates by year
Last spring and first fall frost at NOAA station USC00356749, 1973 to 2025, measured from daily minimum temperatures.
Elevation 159 ft, 45.518, -122.689. Download the data (JSON) · NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Mar 1 | Nov 27 |
| Earliest | Jan 3 (1978) | Oct 25 (2020) |
| Latest | Apr 15 (2022) | Dec 30 (2012) |
| Trend | 1.8 days later per decade | 0.7 days earlier per decade |
| Years with data | 48, 1 with no freeze | 49, 3 with no freeze |
At 28°F (hard freeze) the median last spring date is Feb 5 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 |
|---|---|---|---|---|
| 2025 | Feb 14 | none | Feb 14 | none |
| 2024 | Mar 7 | Dec 1 | Jan 17 | none |
| 2023 | Mar 2 | Oct 28 | Feb 25 | none |
| 2022 | Apr 15 | Nov 13 | Feb 25 | Dec 21 |
| 2021 | Mar 16 | Dec 26 | Feb 14 | Dec 27 |
| 2020 | Mar 14 | Oct 25 | none | none |
| 2019 | Mar 11 | Nov 29 | Mar 5 | none |
| 2018 | Mar 6 | none | Feb 23 | none |
| 2017 | Feb 3 | Dec 13 | Jan 17 | Dec 23 |
| 2016 | Jan 8 | Dec 6 | Jan 4 | Dec 8 |
| 2015 | Jan 31 | Nov 22 | Jan 1 | none |
| 2014 | Mar 2 | Nov 12 | Feb 9 | Nov 30 |
| 2013 | Mar 4 | Nov 21 | Jan 21 | Dec 4 |
| 2012 | Mar 22 | Dec 30 | none | none |
| 2011 | Feb 28 | Nov 20 | Feb 26 | Dec 10 |
| 2010 | none | Nov 21 | none | Nov 23 |
| 2009 | Mar 11 | Dec 4 | none | Dec 5 |
| 2008 | no data | Dec 15 | no data | Dec 15 |
| 2007 | Feb 3 | Nov 25 | Jan 16 | none |
| 2006 | no data | Nov 28 | no data | Nov 29 |
| 2005 | Feb 15 | Nov 21 | Jan 16 | Dec 15 |
| 2004 | Jan 22 | Nov 28 | Jan 8 | none |
| 2003 | Feb 26 | Nov 1 | none | Dec 30 |
| 2002 | Mar 8 | Oct 31 | none | none |
| 2001 | Feb 13 | none | Jan 16 | none |
| 2000 | Mar 6 | Nov 11 | none | Nov 18 |
| 1999 | Jan 5 | no data | none | no data |
| 1998 | Mar 6 | Dec 18 | Jan 13 | Dec 19 |
| 1997 | Feb 8 | Dec 22 | Jan 26 | none |
| 1996 | Mar 26 | Nov 18 | Feb 5 | none |
| 1995 | Mar 7 | Dec 6 | Feb 14 | Dec 9 |
| 1994 | Feb 24 | Nov 3 | Feb 8 | Dec 4 |
| 1993 | Mar 1 | Nov 14 | Feb 27 | Nov 22 |
| 1992 | Feb 5 | Dec 4 | none | Dec 31 |
| 1991 | Jan 30 | Oct 30 | Jan 30 | none |
| 1990 | no data | Dec 18 | no data | Dec 19 |
| 1989 | Mar 3 | Dec 14 | Mar 3 | Dec 27 |
| 1988 | Mar 12 | Dec 18 | Feb 2 | Dec 18 |
| 1987 | Jan 22 | Nov 29 | Jan 17 | Dec 26 |
| 1986 | Feb 19 | Dec 9 | none | none |
| 1984 | Feb 2 | Nov 22 | Jan 18 | Dec 18 |
| 1983 | Jan 21 | Dec 17 | none | Dec 20 |
| 1982 | Feb 24 | Nov 11 | Feb 10 | Dec 30 |
| 1981 | Mar 6 | Nov 28 | Feb 11 | none |
| 1980 | Feb 15 | Dec 6 | Feb 15 | Dec 7 |
| 1979 | Feb 15 | no data | Feb 3 | no data |
| 1978 | Jan 3 | Nov 11 | Jan 3 | Nov 12 |
| 1977 | Mar 14 | no data | Jan 29 | no data |
| 1976 | Mar 12 | Nov 26 | Mar 5 | Dec 1 |
| 1975 | Apr 6 | Nov 18 | Feb 21 | none |
| 1974 | Mar 8 | Dec 23 | Mar 8 | none |
| 1973 | no data | Nov 2 | 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 1991–2020 frost probabilities.