Frost history / Idalia, CO
Idalia, CO: frost dates by year
Last spring and first fall frost at NOAA station USC00054242, 1988 to 2020, measured from daily minimum temperatures.
Elevation 3,965 ft, 39.703, -102.294. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 4 | Oct 8 |
| Earliest | Apr 21 (2003) | Sep 9 (2020) |
| Latest | May 26 (2002) | Oct 25 (2015) |
| Trend | 1.3 days later per decade | 1.0 days later per decade |
| Years with data | 23 | 23 |
At 28°F (hard freeze) the median last spring date is Apr 25 and the median first fall date is Oct 16.
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 |
|---|---|---|---|---|
| 2020 | May 12 | Sep 9 | Apr 18 | Oct 16 |
| 2019 | May 22 | Oct 10 | May 2 | Oct 10 |
| 2018 | Apr 26 | Oct 10 | Apr 25 | Oct 11 |
| 2017 | Apr 30 | Oct 10 | Mar 15 | Oct 15 |
| 2016 | May 3 | Oct 7 | Apr 2 | Oct 7 |
| 2015 | May 12 | Oct 25 | Apr 4 | Oct 29 |
| 2014 | May 14 | no data | May 2 | no data |
| 2013 | May 4 | Oct 16 | May 4 | Oct 16 |
| 2009 | Apr 27 | Oct 2 | Apr 13 | Oct 9 |
| 2008 | no data | Oct 23 | no data | Oct 23 |
| 2007 | Apr 27 | Oct 16 | Apr 14 | Oct 22 |
| 2005 | May 5 | Oct 6 | May 4 | Oct 7 |
| 2004 | no data | Oct 14 | no data | Oct 24 |
| 2003 | Apr 21 | Sep 19 | Apr 8 | Oct 26 |
| 2002 | May 26 | Oct 13 | Apr 28 | Oct 16 |
| 2001 | May 21 | Oct 6 | Apr 23 | Oct 16 |
| 2000 | May 13 | Sep 24 | Apr 18 | Oct 6 |
| 1999 | Apr 24 | no data | Apr 18 | no data |
| 1998 | Apr 30 | Oct 6 | Apr 29 | Oct 21 |
| 1997 | May 9 | Oct 9 | May 3 | Oct 25 |
| 1996 | Apr 30 | no data | Apr 30 | no data |
| 1995 | Apr 28 | no data | Apr 24 | no data |
| 1993 | May 3 | no data | May 2 | no data |
| 1992 | no data | Oct 6 | no data | Oct 8 |
| 1991 | May 6 | Oct 5 | May 1 | Oct 6 |
| 1990 | no data | Oct 8 | no data | Oct 9 |
| 1989 | no data | Sep 12 | no data | Oct 17 |
| 1988 | May 6 | Oct 22 | Apr 26 | Oct 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.