Frost history / Pierce, ID
Pierce, ID: frost dates by year
Last spring and first fall frost at NOAA station USC00107046, 1963 to 2024, measured from daily minimum temperatures.
Elevation 3,080 ft, 46.492, -115.801. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Jun 15 | Sep 1 |
| Earliest | May 14 (1981) | Aug 1 (1987) |
| Latest | Jul 31 (1986) | Sep 30 (2019) |
| Trend | 2.2 days earlier per decade | 2.0 days later per decade |
| Years with data | 43 | 44 |
At 28°F (hard freeze) the median last spring date is May 13 and the median first fall date is Sep 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 |
|---|---|---|---|---|
| 2024 | Jun 16 | Aug 28 | May 3 | Sep 20 |
| 2023 | Jun 22 | no data | Apr 28 | no data |
| 2022 | May 24 | Sep 9 | May 14 | Oct 17 |
| 2021 | Jul 25 | Aug 24 | May 11 | Oct 5 |
| 2020 | Jun 15 | Sep 8 | May 8 | Sep 8 |
| 2019 | Jun 9 | Sep 30 | May 4 | Sep 30 |
| 2018 | Jun 12 | Sep 14 | Apr 24 | Sep 19 |
| 2017 | Jun 11 | no data | May 13 | no data |
| 2016 | Jun 15 | Sep 4 | Apr 19 | Oct 2 |
| 2015 | no data | Sep 4 | no data | Sep 30 |
| 2014 | Jun 6 | Sep 5 | May 13 | Sep 12 |
| 2013 | Jun 2 | Sep 20 | May 3 | Oct 4 |
| 2012 | Jun 7 | Aug 25 | May 13 | Sep 11 |
| 2011 | Jun 5 | Sep 3 | May 5 | Oct 9 |
| 2010 | May 24 | Aug 30 | May 21 | Oct 12 |
| 2009 | May 22 | Aug 25 | May 21 | Oct 1 |
| 2008 | Jul 11 | Sep 2 | May 14 | Oct 9 |
| 2007 | Jun 26 | Sep 8 | May 6 | Sep 21 |
| 2006 | May 30 | Aug 31 | May 14 | Sep 15 |
| 2005 | Jun 13 | Aug 26 | May 1 | Sep 22 |
| 2004 | Jun 16 | Sep 6 | May 14 | Oct 11 |
| 2003 | May 20 | Sep 13 | May 20 | Oct 11 |
| 2002 | Jun 7 | Aug 3 | May 16 | Sep 21 |
| 2001 | Jun 18 | Sep 8 | May 30 | Sep 30 |
| 2000 | Jun 11 | Aug 21 | Apr 11 | Sep 23 |
| 1999 | no data | Sep 1 | no data | Sep 27 |
| 1989 | May 30 | Sep 4 | May 20 | Sep 12 |
| 1988 | Jul 8 | Aug 7 | May 3 | Sep 12 |
| 1987 | Jun 23 | Aug 1 | Apr 22 | Sep 17 |
| 1986 | Jul 31 | Sep 11 | May 23 | Sep 12 |
| 1985 | Jun 26 | Aug 23 | May 14 | Aug 23 |
| 1984 | Jun 30 | Aug 20 | Jun 1 | Sep 15 |
| 1983 | Jun 25 | Sep 6 | May 15 | Sep 10 |
| 1981 | May 14 | Aug 28 | May 6 | Sep 20 |
| 1979 | Jul 3 | no data | Apr 26 | no data |
| 1978 | no data | Aug 27 | no data | Sep 17 |
| 1977 | no data | Sep 1 | no data | Sep 23 |
| 1973 | Jul 2 | no data | May 27 | no data |
| 1972 | May 25 | Aug 31 | May 4 | Sep 10 |
| 1971 | Jul 7 | Sep 7 | May 22 | Sep 14 |
| 1970 | May 18 | Aug 18 | May 16 | Sep 10 |
| 1969 | Jul 26 | Aug 6 | May 5 | Sep 4 |
| 1968 | May 31 | Sep 22 | May 31 | Sep 28 |
| 1967 | May 26 | Aug 25 | May 26 | Oct 17 |
| 1966 | no data | Aug 12 | no data | Oct 3 |
| 1965 | Jun 28 | Aug 30 | Jun 28 | Sep 16 |
| 1964 | Jun 29 | Sep 4 | May 26 | Sep 10 |
| 1963 | Jul 23 | Aug 25 | May 2 | Oct 20 |
"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.