Frost history / Blue Mesa Lake, CO
Blue Mesa Lake, CO: frost dates by year
Last spring and first fall frost at NOAA station USC00050797, 1971 to 2025, measured from daily minimum temperatures.
Elevation 7,568 ft, 38.467, -107.168. Download the data (JSON) · NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Jun 3 | Sep 17 |
| Earliest | May 9 (2009) | Aug 11 (1990) |
| Latest | Jul 2 (1997) | Oct 4 (2022) |
| Trend | little change (less than half a day per decade) | 3.5 days later per decade |
| Years with data | 31 | 34 |
At 28°F (hard freeze) the median last spring date is May 22 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 | May 28 | no data | May 22 | no data |
| 2024 | Jun 6 | no data | Jun 6 | no data |
| 2023 | Jun 24 | Sep 21 | May 18 | Oct 4 |
| 2022 | May 31 | Oct 4 | May 31 | Oct 13 |
| 2021 | Jun 1 | Sep 21 | May 27 | Sep 21 |
| 2020 | Jun 11 | Sep 9 | May 25 | Sep 9 |
| 2019 | Jun 24 | Sep 12 | May 30 | Sep 13 |
| 2018 | May 26 | Sep 14 | May 16 | Sep 27 |
| 2017 | no data | Sep 20 | no data | Sep 25 |
| 2015 | May 31 | Sep 12 | Apr 30 | Oct 25 |
| 2014 | Jun 20 | Oct 1 | May 16 | Oct 6 |
| 2013 | May 28 | Sep 20 | May 21 | Sep 28 |
| 2012 | no data | Sep 18 | no data | Oct 7 |
| 2011 | Jun 15 | Sep 19 | Jun 3 | Oct 7 |
| 2010 | Jun 1 | Sep 7 | May 30 | Sep 11 |
| 2009 | May 9 | Sep 22 | Apr 30 | Sep 22 |
| 2008 | Jun 14 | Sep 24 | Jun 13 | Oct 7 |
| 2007 | Jun 8 | Sep 25 | Jun 8 | Sep 30 |
| 2006 | Jun 1 | Sep 17 | May 29 | Sep 17 |
| 2005 | no data | Sep 15 | no data | Sep 15 |
| 2004 | Jun 1 | Sep 15 | May 14 | Sep 24 |
| 2003 | no data | Sep 14 | no data | Sep 18 |
| 2001 | May 21 | Sep 10 | May 5 | Sep 10 |
| 2000 | May 17 | Sep 25 | May 13 | Sep 25 |
| 1999 | Jun 8 | Sep 21 | Jun 5 | Sep 29 |
| 1998 | Jun 11 | Sep 27 | May 25 | Oct 6 |
| 1997 | Jul 2 | Sep 24 | May 4 | Oct 9 |
| 1996 | Jun 3 | Sep 21 | May 7 | Sep 27 |
| 1995 | Jun 11 | Sep 22 | May 29 | Sep 22 |
| 1994 | May 22 | Sep 16 | May 21 | Oct 8 |
| 1993 | Jun 25 | Sep 2 | May 11 | Sep 2 |
| 1992 | May 10 | Aug 27 | Apr 26 | Sep 27 |
| 1991 | May 29 | Sep 16 | May 13 | Oct 5 |
| 1990 | Jun 9 | Aug 11 | Jun 9 | Aug 11 |
| 1989 | no data | Sep 14 | no data | Oct 6 |
| 1971 | Jun 12 | Sep 4 | Jun 12 | Sep 18 |
"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 1991–2020 frost probabilities.