Frost history / Twin Lakes Rsvr, CO
Twin Lakes Rsvr, CO: frost dates by year
Last spring and first fall frost at NOAA station USC00058501, 1967 to 2025, measured from daily minimum temperatures.
Elevation 9,236 ft, 39.094, -106.351. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Jun 15 | Sep 10 |
| Earliest | May 26 (2025) | Aug 1 (1971) |
| Latest | Jul 31 (1977) | Oct 5 (2024) |
| Trend | 7.0 days earlier per decade | 7.4 days later per decade |
| Years with data | 36 | 39 |
At 28°F (hard freeze) the median last spring date is Jun 1 and the median first fall date is Sep 21.
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 26 | Sep 18 | May 20 | Oct 17 |
| 2024 | May 31 | Oct 5 | May 24 | Oct 25 |
| 2023 | Jun 18 | Sep 20 | May 9 | Oct 13 |
| 2022 | Jun 4 | Sep 11 | May 31 | Oct 15 |
| 2021 | Jun 1 | Sep 21 | May 24 | Sep 21 |
| 2020 | Jun 20 | Sep 9 | May 24 | Sep 9 |
| 2019 | Jul 2 | Sep 13 | Jun 27 | Sep 14 |
| 2018 | Jun 12 | Sep 18 | May 31 | Sep 22 |
| 2017 | Jun 15 | Sep 18 | May 29 | Sep 25 |
| 2016 | May 31 | Sep 10 | May 31 | Sep 10 |
| 2015 | May 30 | Sep 11 | May 16 | Oct 25 |
| 2014 | Jun 25 | Sep 11 | Jun 15 | Sep 11 |
| 2013 | Jun 24 | Sep 17 | Jun 6 | Sep 20 |
| 2012 | Jun 13 | Sep 14 | Jun 11 | Sep 28 |
| 2011 | Jun 15 | Sep 22 | May 31 | Sep 22 |
| 2010 | Jun 15 | Sep 7 | May 30 | Sep 7 |
| 2009 | Jun 17 | Aug 17 | May 8 | Sep 22 |
| 2008 | Jun 14 | Sep 9 | Jun 12 | Oct 2 |
| 2007 | Jun 15 | Sep 11 | Jun 8 | Sep 25 |
| 2006 | Jun 23 | no data | May 11 | no data |
| 2005 | Jun 16 | Sep 14 | Jun 13 | Sep 14 |
| 2003 | Jun 14 | Sep 10 | Jun 7 | Sep 13 |
| 2002 | May 29 | Sep 24 | May 25 | Oct 6 |
| 2001 | Jul 28 | Sep 7 | Jun 5 | Sep 8 |
| 2000 | Jun 2 | no data | May 14 | no data |
| 1999 | no data | Sep 9 | no data | Sep 21 |
| 1998 | Jun 16 | Sep 27 | Jun 7 | Oct 5 |
| 1997 | May 28 | Sep 23 | May 26 | Oct 1 |
| 1994 | Jun 9 | Sep 15 | May 8 | Oct 7 |
| 1993 | Jun 24 | Sep 3 | Jun 4 | Sep 14 |
| 1977 | Jul 31 | Aug 1 | Jun 22 | Aug 28 |
| 1976 | no data | Aug 7 | no data | Sep 28 |
| 1975 | no data | Aug 2 | no data | Aug 2 |
| 1974 | Jun 28 | Aug 11 | Jun 21 | Sep 4 |
| 1973 | Jul 22 | Aug 3 | Jun 28 | Aug 5 |
| 1972 | Jul 11 | Aug 6 | Jul 2 | Aug 23 |
| 1971 | Jul 29 | Aug 1 | Jul 11 | Sep 5 |
| 1970 | no data | Sep 3 | no data | Sep 10 |
| 1969 | Jul 8 | Aug 21 | Jun 3 | Sep 26 |
| 1968 | Jul 12 | Aug 16 | Jul 12 | Aug 24 |
| 1967 | no data | Aug 20 | no data | Sep 20 |
"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.