Frost history / Preston, ID
Preston, ID: frost dates by year
Last spring and first fall frost at NOAA station USC00107346, 1965 to 2025, measured from daily minimum temperatures.
Elevation 4,719 ft, 42.093, -111.882. Download the data (JSON) · NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 14 | Sep 25 |
| Earliest | Apr 26 (2023) | Aug 26 (1992) |
| Latest | Jul 1 (1968) | Oct 27 (2015) |
| Trend | 2.1 days earlier per decade | 3.2 days later per decade |
| Years with data | 37 | 41 |
At 28°F (hard freeze) the median last spring date is May 4 and the median first fall date is Oct 7.
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 | May 19 | Oct 7 | Apr 19 | Oct 21 |
| 2024 | Jun 18 | Oct 19 | May 2 | Oct 25 |
| 2023 | Apr 26 | Oct 26 | Apr 23 | Oct 26 |
| 2022 | Jun 15 | Oct 20 | May 21 | Oct 24 |
| 2021 | May 12 | Sep 21 | Apr 22 | Oct 13 |
| 2020 | May 23 | Sep 9 | May 7 | Sep 27 |
| 2019 | Jun 9 | Sep 29 | May 3 | Oct 3 |
| 2018 | May 3 | Sep 26 | Apr 18 | Oct 12 |
| 2017 | May 20 | Sep 23 | May 18 | Oct 3 |
| 2016 | no data | Oct 6 | no data | Oct 7 |
| 2015 | May 11 | Oct 27 | Apr 15 | Oct 28 |
| 2014 | May 14 | Sep 12 | May 13 | Oct 22 |
| 2013 | May 3 | Oct 3 | May 2 | Oct 5 |
| 2012 | May 11 | Oct 4 | May 6 | Oct 4 |
| 2011 | Jun 3 | Oct 9 | May 4 | Oct 26 |
| 2010 | May 23 | Sep 7 | May 7 | Oct 27 |
| 2009 | May 13 | Oct 1 | May 9 | Oct 2 |
| 2008 | no data | Oct 10 | no data | Oct 10 |
| 2007 | May 23 | no data | Apr 14 | no data |
| 2006 | May 11 | Sep 18 | May 10 | Oct 18 |
| 2005 | May 1 | Sep 26 | Apr 20 | Oct 6 |
| 2004 | May 30 | no data | Mar 29 | no data |
| 2003 | May 20 | Sep 14 | May 6 | Oct 11 |
| 2002 | Jun 10 | Oct 12 | May 9 | Oct 12 |
| 2000 | Jun 2 | no data | Apr 9 | no data |
| 1999 | no data | Sep 12 | no data | Sep 27 |
| 1995 | May 8 | no data | Apr 24 | no data |
| 1994 | May 3 | Oct 8 | May 1 | Oct 19 |
| 1993 | no data | Sep 14 | no data | Oct 19 |
| 1992 | May 10 | Aug 26 | Apr 24 | Oct 7 |
| 1991 | no data | Sep 15 | no data | Oct 5 |
| 1990 | no data | Oct 7 | no data | Oct 7 |
| 1989 | no data | Sep 13 | no data | Oct 16 |
| 1987 | May 3 | no data | Apr 21 | no data |
| 1986 | no data | Sep 22 | no data | Oct 13 |
| 1985 | May 14 | Sep 23 | May 13 | Sep 23 |
| 1984 | May 7 | Sep 22 | May 7 | Sep 22 |
| 1983 | May 14 | Sep 20 | May 12 | Sep 20 |
| 1982 | Jun 9 | no data | Jun 6 | no data |
| 1981 | May 13 | Sep 26 | May 7 | Sep 26 |
| 1972 | no data | Sep 25 | no data | Sep 25 |
| 1971 | no data | Sep 16 | no data | Sep 19 |
| 1970 | Jun 14 | Sep 15 | Jun 14 | Sep 23 |
| 1969 | Jun 29 | Oct 3 | May 1 | Oct 5 |
| 1968 | Jul 1 | no data | May 10 | no data |
| 1967 | May 14 | Sep 13 | May 3 | Oct 13 |
| 1966 | no data | Oct 1 | no data | Oct 4 |
| 1965 | May 27 | Sep 1 | May 7 | Sep 18 |
"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.