Frost history / Coal Creek Canyon, CO
Coal Creek Canyon, CO: frost dates by year
Last spring and first fall frost at NOAA station USC00051681, 1984 to 2019, measured from daily minimum temperatures.
Elevation 8,950 ft, 39.896, -105.385. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Jun 8 | Sep 15 |
| Earliest | May 20 (2018) | Aug 25 (1992) |
| Latest | Jun 27 (1985) | Sep 28 (2012) |
| Trend | 1.7 days earlier per decade | 0.8 days later per decade |
| Years with data | 35 | 35 |
At 28°F (hard freeze) the median last spring date is May 22 and the median first fall date is Sep 22.
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 |
|---|---|---|---|---|
| 2019 | Jun 23 | no data | May 30 | no data |
| 2018 | May 20 | Sep 21 | Apr 27 | Sep 25 |
| 2017 | May 30 | Sep 24 | May 23 | Sep 26 |
| 2016 | May 28 | Sep 10 | May 18 | Sep 10 |
| 2015 | May 30 | Sep 19 | May 24 | Oct 16 |
| 2014 | Jun 15 | Sep 11 | Jun 9 | Sep 12 |
| 2013 | Jun 6 | Sep 20 | May 11 | Sep 27 |
| 2012 | May 31 | Sep 28 | May 14 | Oct 3 |
| 2011 | Jun 10 | Sep 4 | May 20 | Oct 7 |
| 2010 | Jun 14 | Sep 3 | May 25 | Oct 13 |
| 2009 | Jun 8 | Sep 21 | May 14 | Sep 21 |
| 2008 | Jun 12 | Sep 3 | May 23 | Oct 11 |
| 2007 | Jun 8 | Sep 11 | Jun 8 | Sep 25 |
| 2006 | May 30 | Sep 3 | May 29 | Sep 17 |
| 2005 | Jun 4 | Sep 28 | May 14 | Oct 5 |
| 2004 | Jun 22 | Aug 28 | May 30 | Sep 21 |
| 2003 | Jun 8 | Sep 11 | May 21 | Sep 13 |
| 2002 | Jun 5 | Sep 19 | May 25 | Sep 22 |
| 2001 | Jun 14 | Sep 7 | Jun 14 | Sep 8 |
| 2000 | Jun 18 | Sep 20 | May 14 | Sep 20 |
| 1999 | Jun 11 | Sep 12 | May 17 | Sep 13 |
| 1998 | Jun 15 | Sep 22 | Jun 6 | Oct 4 |
| 1997 | May 26 | Sep 24 | May 12 | Oct 9 |
| 1996 | Jun 7 | Sep 18 | May 1 | Sep 18 |
| 1995 | Jun 11 | Sep 20 | May 26 | Sep 20 |
| 1994 | Jun 10 | Sep 16 | May 3 | Sep 21 |
| 1993 | Jun 25 | Sep 2 | May 11 | Sep 13 |
| 1992 | Jun 2 | Aug 25 | Apr 26 | Sep 18 |
| 1991 | May 30 | Sep 15 | May 5 | Sep 19 |
| 1990 | Jun 2 | Sep 22 | Jun 2 | Oct 7 |
| 1989 | Jun 22 | Sep 10 | May 26 | Sep 11 |
| 1988 | May 22 | Sep 4 | May 22 | Sep 13 |
| 1987 | Jun 4 | Sep 17 | May 27 | Sep 29 |
| 1986 | Jun 11 | Sep 19 | May 23 | Sep 26 |
| 1985 | Jun 27 | Sep 13 | May 15 | Sep 22 |
| 1984 | no data | Sep 15 | no data | Sep 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.