Frost history / Hecla 1E, WY
Hecla 1E, WY: frost dates by year
Last spring and first fall frost at NOAA station USC00484442, 1995 to 2025, measured from daily minimum temperatures.
Elevation 6,690 ft, 41.150, -105.167. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 26 | Sep 20 |
| Earliest | May 3 (2018) | Aug 17 (2002) |
| Latest | Jul 1 (2014) | Oct 7 (2025) |
| Trend | 2.7 days later per decade | 3.0 days later per decade |
| Years with data | 24 | 26 |
At 28°F (hard freeze) the median last spring date is May 13 and the median first fall date is Sep 27.
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 | no data | Oct 7 | no data | Oct 13 |
| 2024 | Jun 20 | Oct 1 | May 5 | Oct 16 |
| 2022 | May 25 | no data | May 22 | no data |
| 2021 | no data | Sep 21 | no data | Oct 13 |
| 2019 | May 24 | no data | May 22 | no data |
| 2018 | May 3 | Sep 26 | May 1 | Sep 26 |
| 2017 | May 26 | Sep 22 | May 20 | Oct 3 |
| 2016 | no data | Sep 4 | no data | Sep 9 |
| 2014 | Jul 1 | Sep 4 | May 15 | Sep 12 |
| 2013 | May 22 | Sep 23 | May 5 | Sep 26 |
| 2012 | May 29 | Oct 4 | May 13 | Oct 4 |
| 2011 | Jun 10 | Sep 4 | May 13 | Sep 20 |
| 2010 | May 23 | Sep 7 | May 13 | Oct 25 |
| 2009 | no data | Aug 17 | no data | Sep 28 |
| 2008 | May 27 | Sep 5 | May 11 | Sep 5 |
| 2007 | Jun 9 | Sep 25 | Jun 8 | Oct 21 |
| 2006 | May 29 | Sep 2 | May 29 | Sep 24 |
| 2005 | Jun 14 | Sep 27 | May 12 | Sep 27 |
| 2004 | Jun 2 | Sep 22 | May 13 | Oct 18 |
| 2003 | Jun 8 | Sep 13 | May 11 | Sep 15 |
| 2002 | May 24 | Aug 17 | May 10 | Oct 2 |
| 2001 | May 21 | Sep 9 | May 21 | Oct 5 |
| 2000 | May 19 | Sep 20 | May 13 | Sep 22 |
| 1999 | May 18 | Sep 9 | May 13 | Sep 13 |
| 1998 | Jun 5 | Oct 5 | May 2 | Oct 19 |
| 1997 | May 13 | Sep 24 | May 12 | Oct 9 |
| 1996 | May 29 | Sep 17 | May 6 | Sep 26 |
| 1995 | May 24 | Sep 20 | May 14 | Sep 21 |
"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.