Frost history / Gross Rsvr, CO
Gross Rsvr, CO: frost dates by year
Last spring and first fall frost at NOAA station USC00053629, 2004 to 2025, measured from daily minimum temperatures.
Elevation 7,970 ft, 39.936, -105.350. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 18 | Oct 3 |
| Earliest | May 5 (2018) | Aug 16 (2009) |
| Latest | Jun 21 (2008) | Oct 16 (2015) |
| Trend | 3.1 days earlier per decade | 4.0 days later per decade |
| Years with data | 20 | 22 |
At 28°F (hard freeze) the median last spring date is May 4 and the median first fall date is Oct 9.
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 23 | Oct 8 | Apr 30 | Oct 13 |
| 2024 | May 23 | Oct 1 | May 4 | Oct 25 |
| 2023 | May 9 | Oct 7 | Apr 29 | Oct 13 |
| 2022 | May 31 | Oct 8 | May 22 | Oct 17 |
| 2021 | May 13 | Sep 21 | Apr 23 | Oct 15 |
| 2020 | May 12 | Sep 8 | Apr 19 | Sep 9 |
| 2019 | no data | Oct 4 | no data | Oct 7 |
| 2018 | May 5 | Sep 26 | Apr 26 | Oct 10 |
| 2017 | May 28 | Sep 26 | May 21 | Oct 9 |
| 2016 | May 13 | Oct 5 | May 3 | Oct 5 |
| 2015 | May 25 | Oct 16 | May 12 | Oct 28 |
| 2014 | Jun 9 | Sep 12 | May 15 | Sep 12 |
| 2013 | May 21 | Oct 4 | May 5 | Oct 5 |
| 2012 | May 14 | Oct 4 | Apr 29 | Oct 5 |
| 2011 | May 21 | Sep 22 | May 6 | Oct 7 |
| 2010 | May 16 | Oct 13 | May 14 | Oct 26 |
| 2009 | no data | Aug 16 | no data | Aug 16 |
| 2008 | Jun 21 | Oct 7 | Jun 21 | Oct 13 |
| 2007 | Jun 9 | Sep 25 | Apr 26 | Oct 22 |
| 2006 | May 15 | Sep 19 | May 12 | Sep 24 |
| 2005 | May 13 | Oct 6 | May 12 | Oct 7 |
| 2004 | May 15 | Sep 23 | May 2 | Oct 25 |
"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.