Frost history / Roxborough Sp, CO
Roxborough Sp, CO: frost dates by year
Last spring and first fall frost at NOAA station USC00057249, 1995 to 2024, measured from daily minimum temperatures.
Elevation 6,117 ft, 39.429, -105.070. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 17 | Oct 5 |
| Earliest | May 4 (2018) | Sep 8 (2001) |
| Latest | Jun 18 (1998) | Oct 25 (2024) |
| Trend | 5.8 days earlier per decade | 7.5 days later per decade |
| Years with data | 23 | 24 |
At 28°F (hard freeze) the median last spring date is May 10 and the median first fall date is Oct 10.
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 |
|---|---|---|---|---|
| 2024 | no data | Oct 25 | no data | Oct 31 |
| 2023 | no data | Oct 13 | no data | Oct 14 |
| 2022 | no data | Oct 13 | no data | Oct 17 |
| 2021 | May 12 | Oct 10 | May 12 | Oct 13 |
| 2020 | May 11 | Sep 8 | May 10 | Sep 9 |
| 2019 | May 31 | Oct 6 | May 22 | Oct 10 |
| 2018 | May 4 | no data | Apr 25 | no data |
| 2017 | May 23 | Sep 20 | May 22 | Oct 10 |
| 2016 | May 18 | Oct 5 | Apr 28 | Oct 17 |
| 2015 | May 11 | Oct 6 | May 10 | Oct 28 |
| 2014 | no data | Sep 12 | no data | Oct 31 |
| 2013 | May 21 | no data | May 5 | no data |
| 2012 | May 8 | Oct 5 | Apr 29 | Oct 5 |
| 2011 | May 17 | Oct 7 | May 5 | Oct 7 |
| 2010 | May 15 | Oct 18 | May 8 | Oct 28 |
| 2008 | Jun 13 | Oct 9 | May 3 | Oct 14 |
| 2007 | May 7 | no data | Apr 20 | no data |
| 2006 | May 11 | Sep 17 | May 11 | Sep 17 |
| 2005 | May 12 | Oct 5 | May 1 | Oct 6 |
| 2004 | May 30 | Sep 15 | May 14 | Oct 14 |
| 2003 | May 11 | Sep 14 | Apr 8 | Oct 14 |
| 2002 | May 26 | Sep 22 | May 9 | Oct 4 |
| 2001 | May 22 | Sep 8 | May 21 | Oct 6 |
| 2000 | May 13 | no data | May 13 | no data |
| 1999 | no data | Sep 14 | no data | Sep 29 |
| 1998 | Jun 18 | Oct 5 | May 15 | Oct 5 |
| 1997 | May 28 | no data | May 10 | no data |
| 1996 | May 29 | Sep 19 | May 10 | Sep 26 |
| 1995 | no data | Sep 21 | no data | Sep 21 |
"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.