Frost history / Sheep Mtn, CO
Sheep Mtn, CO: frost dates by year
Last spring and first fall frost at NOAA station USC00057572, 1988 to 2017, measured from daily minimum temperatures.
Elevation 7,744 ft, 37.715, -105.235. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 17 | Sep 28 |
| Earliest | Apr 26 (1992) | Aug 3 (1998) |
| Latest | Jul 25 (1998) | Oct 17 (2015) |
| Trend | 0.9 days later per decade | 6.1 days later per decade |
| Years with data | 26 | 23 |
At 28°F (hard freeze) the median last spring date is May 8 and the median first fall date is Oct 8.
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 |
|---|---|---|---|---|
| 2017 | Jun 7 | Sep 26 | May 21 | Oct 9 |
| 2016 | May 28 | Oct 5 | May 3 | Oct 5 |
| 2015 | May 20 | Oct 17 | May 20 | Oct 28 |
| 2014 | May 18 | no data | May 18 | no data |
| 2013 | May 11 | Sep 29 | May 6 | Oct 5 |
| 2012 | May 12 | Oct 4 | Apr 30 | Oct 4 |
| 2011 | May 18 | Oct 8 | May 3 | Oct 18 |
| 2010 | May 13 | Oct 10 | May 9 | Oct 13 |
| 2009 | May 14 | no data | Apr 27 | no data |
| 2008 | Jun 9 | Oct 7 | May 14 | Oct 13 |
| 2006 | May 12 | no data | May 12 | no data |
| 2005 | May 13 | Oct 6 | May 12 | Oct 31 |
| 2004 | no data | Sep 22 | no data | Oct 14 |
| 2002 | May 26 | Sep 23 | May 14 | Oct 13 |
| 2001 | May 23 | no data | May 21 | no data |
| 2000 | May 19 | Sep 24 | May 13 | Sep 24 |
| 1999 | Jun 11 | Sep 28 | Jun 11 | Sep 28 |
| 1998 | Jul 25 | Aug 3 | Apr 28 | Aug 27 |
| 1997 | May 13 | Oct 9 | May 3 | Oct 13 |
| 1996 | May 2 | Sep 26 | May 1 | Sep 27 |
| 1995 | May 30 | Sep 21 | May 2 | Sep 21 |
| 1994 | May 12 | Sep 22 | May 1 | Oct 25 |
| 1993 | May 10 | Sep 13 | May 9 | Sep 13 |
| 1992 | Apr 26 | Sep 16 | Apr 24 | Oct 7 |
| 1991 | May 16 | Sep 23 | May 4 | Sep 23 |
| 1990 | May 16 | Oct 7 | May 9 | Oct 8 |
| 1988 | May 30 | Sep 28 | May 4 | Oct 27 |
"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.