Frost history / Twin Falls Sun Vly Rgnl Ap, ID
Twin Falls Sun Vly Rgnl Ap, ID: frost dates by year
Last spring and first fall frost at NOAA station USW00094178, 1997 to 2024, measured from daily minimum temperatures.
Elevation 4,151 ft, 42.482, -114.487. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 9 | Oct 7 |
| Earliest | Apr 16 (2015) | Sep 9 (2020) |
| Latest | May 23 (2010) | Nov 4 (2015) |
| Trend | little change (less than half a day per decade) | 3.2 days later per decade |
| Years with data | 27 | 28 |
At 28°F (hard freeze) the median last spring date is Apr 18 and the median first fall date is Oct 23.
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 | May 2 | Oct 18 | Apr 19 | Oct 24 |
| 2023 | Apr 23 | Oct 26 | Apr 20 | Oct 27 |
| 2022 | May 21 | Oct 23 | May 9 | Oct 27 |
| 2021 | May 11 | Sep 21 | Apr 12 | Nov 8 |
| 2020 | May 16 | Sep 9 | Apr 18 | Oct 23 |
| 2019 | May 10 | Sep 29 | May 10 | Sep 30 |
| 2018 | May 1 | Oct 13 | Apr 18 | Oct 14 |
| 2017 | May 18 | Sep 17 | Apr 16 | Oct 3 |
| 2016 | Apr 17 | Oct 7 | Mar 26 | Nov 17 |
| 2015 | Apr 16 | Nov 4 | Apr 3 | Nov 8 |
| 2014 | May 13 | Oct 27 | Mar 23 | Oct 28 |
| 2013 | May 3 | Oct 6 | Apr 23 | Oct 29 |
| 2012 | May 6 | Oct 4 | Apr 8 | Oct 4 |
| 2011 | May 17 | Oct 18 | Apr 23 | Oct 26 |
| 2010 | May 23 | Oct 13 | May 23 | Nov 20 |
| 2009 | May 13 | Oct 1 | Apr 6 | Oct 12 |
| 2008 | May 10 | Oct 10 | Apr 26 | Oct 10 |
| 2007 | Apr 20 | Oct 18 | Apr 11 | Nov 1 |
| 2006 | May 3 | Sep 24 | Mar 27 | Oct 21 |
| 2005 | May 1 | Sep 26 | Apr 15 | Oct 6 |
| 2004 | Apr 21 | Oct 22 | Mar 29 | Oct 31 |
| 2003 | May 20 | Sep 13 | May 20 | Oct 11 |
| 2002 | May 9 | Oct 1 | May 9 | Oct 13 |
| 2001 | May 3 | Oct 10 | Apr 15 | Oct 24 |
| 2000 | May 12 | Sep 24 | Apr 8 | Sep 25 |
| 1999 | May 16 | Sep 27 | May 10 | Sep 27 |
| 1998 | Apr 26 | Oct 11 | Apr 18 | Oct 11 |
| 1997 | no data | Oct 6 | no data | Oct 24 |
"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.