Frost history / Renton Muni Ap, WA
Renton Muni Ap, WA: frost dates by year
Last spring and first fall frost at NOAA station USW00094248, 1999 to 2024, measured from daily minimum temperatures.
Elevation 29 ft, 47.493, -122.214. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Mar 19 | Nov 10 |
| Earliest | Jan 15 (2016) | Oct 25 (2020) |
| Latest | Apr 11 (2021) | Dec 25 (1999) |
| Trend | 1.6 days later per decade | 1.2 days earlier per decade |
| Years with data | 26 | 25 |
At 28°F (hard freeze) the median last spring date is Feb 10 and the median first fall date is Nov 24.
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 7 | no data | Jan 16 | no data |
| 2023 | Mar 27 | Oct 28 | Feb 25 | none |
| 2022 | Mar 10 | Nov 9 | Feb 25 | Nov 19 |
| 2021 | Apr 11 | Nov 17 | Feb 13 | Dec 26 |
| 2020 | Mar 17 | Oct 25 | none | none |
| 2019 | Mar 11 | Oct 30 | Mar 4 | Nov 30 |
| 2018 | Mar 15 | Nov 18 | Feb 23 | Dec 1 |
| 2017 | Mar 19 | Dec 4 | Feb 1 | none |
| 2016 | Jan 15 | Dec 5 | Jan 2 | Dec 7 |
| 2015 | Mar 4 | Nov 20 | Jan 1 | Nov 26 |
| 2014 | Mar 22 | Nov 12 | Feb 5 | Nov 14 |
| 2013 | Mar 24 | Nov 20 | Jan 16 | Nov 21 |
| 2012 | Mar 23 | Nov 10 | Jan 16 | none |
| 2011 | Apr 8 | Nov 6 | Feb 26 | Nov 20 |
| 2010 | Mar 18 | Nov 22 | none | Nov 22 |
| 2009 | Mar 26 | Nov 14 | Mar 12 | Dec 5 |
| 2008 | Apr 3 | Dec 13 | Jan 26 | Dec 14 |
| 2007 | Apr 3 | Oct 26 | Feb 2 | Nov 23 |
| 2006 | Mar 20 | Oct 30 | Feb 20 | Nov 28 |
| 2005 | Feb 24 | Nov 15 | Feb 22 | Nov 28 |
| 2004 | Feb 13 | Nov 4 | Jan 6 | none |
| 2003 | Feb 27 | Oct 31 | Feb 25 | Oct 31 |
| 2002 | Mar 8 | Oct 30 | Feb 25 | Nov 2 |
| 2001 | Mar 22 | Oct 28 | Feb 7 | none |
| 2000 | Mar 20 | Nov 10 | none | Nov 11 |
| 1999 | Mar 11 | Dec 25 | none | 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 to 2020 frost probabilities.