Frost history / Waverly 1W, CO
Waverly 1W, CO: frost dates by year
Last spring and first fall frost at NOAA station USC00058860, 2004 to 2025, measured from daily minimum temperatures.
Elevation 7,603 ft, 37.430, -106.032. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 31 | Sep 16 |
| Earliest | May 25 (2021) | Aug 9 (2009) |
| Latest | Jun 19 (2014) | Oct 6 (2024) |
| Trend | 9.4 days earlier per decade | 8.2 days later per decade |
| Years with data | 21 | 22 |
At 28°F (hard freeze) the median last spring date is May 22 and the median first fall date is Sep 24.
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 27 | Sep 24 | May 21 | Oct 5 |
| 2024 | May 27 | Oct 6 | May 22 | Oct 9 |
| 2023 | May 28 | Sep 20 | May 1 | Oct 13 |
| 2022 | May 31 | Sep 18 | May 22 | Oct 10 |
| 2021 | May 25 | Sep 21 | May 24 | Sep 22 |
| 2020 | May 26 | Sep 9 | May 22 | Sep 9 |
| 2019 | May 31 | Sep 13 | May 30 | Sep 22 |
| 2018 | May 26 | Sep 14 | May 4 | Sep 27 |
| 2017 | May 28 | Sep 25 | May 21 | Sep 25 |
| 2016 | May 28 | Sep 15 | May 14 | Sep 24 |
| 2015 | May 26 | Sep 20 | May 17 | Oct 13 |
| 2014 | Jun 19 | Sep 13 | May 17 | Oct 1 |
| 2013 | Jun 2 | Sep 24 | Jun 2 | Sep 24 |
| 2012 | Jun 11 | Sep 15 | May 29 | Oct 2 |
| 2011 | Jun 12 | Sep 18 | Jun 8 | Oct 7 |
| 2010 | Jun 15 | Sep 7 | May 31 | Sep 13 |
| 2009 | Jun 13 | Aug 9 | May 3 | Sep 22 |
| 2008 | Jun 14 | Sep 7 | Jun 13 | Sep 13 |
| 2007 | Jun 9 | Sep 19 | Jun 8 | Sep 19 |
| 2006 | May 29 | Sep 17 | May 12 | Sep 17 |
| 2005 | Jun 13 | Sep 13 | May 13 | Sep 15 |
| 2004 | no data | Sep 5 | no data | Sep 22 |
"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.