Frost history / Humptulips Salmon Hatchery, WA
Humptulips Salmon Hatchery, WA: frost dates by year
Last spring and first fall frost at NOAA station USC00453826, 1987 to 2025, measured from daily minimum temperatures.
Elevation 140 ft, 47.234, -123.990. Download the data (JSON) · NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 1 | Oct 17 |
| Earliest | Mar 13 (2005) | Sep 15 (1992) |
| Latest | Jun 2 (1999) | Dec 5 (2016) |
| Trend | 8.3 days earlier per decade | 4.7 days later per decade |
| Years with data | 32 | 33 |
At 28°F (hard freeze) the median last spring date is Mar 27 and the median first fall date is Nov 9.
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 | Apr 23 | Oct 14 | Feb 13 | none |
| 2024 | Apr 23 | Nov 15 | Mar 6 | Dec 5 |
| 2023 | Apr 6 | Oct 27 | Apr 4 | Oct 28 |
| 2022 | Apr 28 | Oct 23 | Apr 6 | Nov 9 |
| 2021 | Apr 15 | Oct 11 | Apr 13 | Dec 5 |
| 2020 | Apr 14 | Oct 22 | Apr 14 | Nov 8 |
| 2019 | Apr 30 | Sep 30 | Mar 12 | Oct 30 |
| 2018 | Apr 3 | Oct 14 | Mar 26 | Dec 3 |
| 2017 | Apr 4 | Oct 14 | Feb 26 | Dec 5 |
| 2016 | no data | Dec 5 | no data | Dec 7 |
| 2014 | Mar 23 | no data | Feb 8 | no data |
| 2013 | May 2 | Oct 29 | Feb 8 | Nov 5 |
| 2012 | Apr 7 | Oct 4 | Mar 7 | none |
| 2010 | May 7 | no data | Feb 22 | no data |
| 2009 | no data | Oct 4 | no data | Dec 2 |
| 2008 | Apr 30 | no data | Apr 1 | no data |
| 2007 | no data | Oct 26 | no data | Nov 22 |
| 2006 | May 8 | Oct 29 | Mar 19 | Oct 29 |
| 2005 | Mar 13 | Dec 2 | Feb 23 | Dec 7 |
| 2004 | Apr 17 | Nov 2 | Apr 2 | Nov 27 |
| 2003 | May 18 | no data | Apr 4 | no data |
| 2002 | May 15 | Oct 11 | May 6 | Oct 29 |
| 2001 | May 10 | Oct 27 | Apr 13 | Dec 3 |
| 2000 | May 6 | Oct 29 | Mar 7 | Nov 9 |
| 1999 | Jun 2 | Sep 27 | Apr 19 | Nov 2 |
| 1998 | no data | Oct 19 | no data | Dec 18 |
| 1997 | May 3 | Oct 19 | Apr 7 | Dec 21 |
| 1996 | May 10 | Sep 23 | May 9 | Oct 31 |
| 1995 | Apr 23 | Oct 29 | Mar 16 | Oct 30 |
| 1994 | May 3 | Oct 11 | Mar 27 | Nov 3 |
| 1993 | Apr 19 | Sep 20 | Mar 28 | Nov 7 |
| 1992 | May 21 | Sep 15 | Apr 11 | Oct 15 |
| 1991 | May 13 | Oct 17 | Apr 11 | Oct 30 |
| 1990 | May 8 | Oct 6 | Mar 28 | Nov 26 |
| 1989 | May 21 | Oct 2 | Mar 20 | Oct 28 |
| 1988 | May 7 | Oct 27 | Mar 16 | Nov 14 |
| 1987 | no data | Oct 10 | no data | Nov 17 |
"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.