Frost history / Bern, ID
Bern, ID: frost dates by year
Last spring and first fall frost at NOAA station USC00100803, 1992 to 2025, measured from daily minimum temperatures.
Elevation 5,964 ft, 42.335, -111.385. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Jun 19 | Sep 3 |
| Earliest | May 26 (2016) | Aug 4 (2016) |
| Latest | Jul 31 (1995) | Oct 1 (2022) |
| Trend | 3.4 days earlier per decade | 4.3 days later per decade |
| Years with data | 30 | 32 |
At 28°F (hard freeze) the median last spring date is May 28 and the median first fall date is Sep 14.
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 | Jun 23 | Sep 16 | May 16 | Oct 6 |
| 2024 | Jun 19 | Aug 29 | Jun 18 | Aug 29 |
| 2023 | Jun 22 | Sep 23 | Apr 30 | Oct 27 |
| 2022 | Jun 21 | Oct 1 | Jun 15 | Oct 12 |
| 2021 | Jun 11 | Sep 4 | Jun 11 | Sep 21 |
| 2020 | Jun 18 | Aug 31 | Jun 9 | Sep 1 |
| 2019 | Jun 23 | Aug 27 | Jun 21 | Sep 22 |
| 2018 | Jun 12 | Aug 28 | May 4 | Sep 19 |
| 2017 | Jun 14 | Sep 16 | May 20 | Sep 20 |
| 2016 | May 26 | Aug 4 | May 11 | Sep 6 |
| 2015 | Jul 28 | Sep 6 | May 11 | Sep 6 |
| 2014 | Jun 19 | Sep 12 | Jun 19 | Sep 12 |
| 2013 | Jun 20 | Sep 19 | May 24 | Sep 19 |
| 2012 | Jun 20 | Sep 12 | Jun 7 | Sep 12 |
| 2011 | Jun 17 | Sep 2 | Jun 3 | Oct 10 |
| 2010 | Jun 18 | Aug 24 | May 25 | Sep 6 |
| 2009 | no data | Aug 16 | no data | Sep 22 |
| 2008 | Jun 13 | Aug 27 | Jun 8 | Oct 7 |
| 2007 | Jun 27 | Sep 10 | May 30 | Sep 10 |
| 2006 | Jun 15 | Sep 1 | May 31 | Sep 1 |
| 2005 | no data | Aug 31 | no data | Sep 13 |
| 2003 | Jun 4 | no data | May 19 | no data |
| 2002 | Jun 13 | Aug 9 | Jun 11 | Sep 22 |
| 2001 | Jun 14 | Sep 7 | Jun 13 | Sep 8 |
| 2000 | Jun 17 | Sep 7 | Jun 1 | Sep 7 |
| 1999 | Jun 26 | Sep 5 | May 17 | Sep 8 |
| 1998 | Jun 20 | Sep 20 | May 18 | Oct 5 |
| 1997 | Jul 2 | Sep 16 | May 8 | Sep 28 |
| 1996 | May 31 | Aug 7 | May 6 | Sep 6 |
| 1995 | Jul 31 | Aug 9 | May 7 | Sep 21 |
| 1994 | Jul 6 | Sep 5 | May 21 | Sep 15 |
| 1993 | Jul 13 | Aug 27 | Jul 13 | Aug 27 |
| 1992 | no data | Aug 24 | no data | Aug 25 |
"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.