Frost history / Monument, CO
Monument, CO: frost dates by year
Last spring and first fall frost at NOAA station USC00055734, 1988 to 2001, measured from daily minimum temperatures.
Elevation 7,080 ft, 39.102, -104.868. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 17 | Sep 22 |
| Earliest | Apr 29 (1996) | Sep 8 (2001) |
| Latest | Jun 1 (1992) | Oct 9 (1997) |
| Trend | 6.1 days earlier per decade | 2.2 days earlier per decade |
| Years with data | 11 | 14 |
At 28°F (hard freeze) the median last spring date is May 1 and the median first fall date is Oct 2.
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 |
|---|---|---|---|---|
| 2001 | no data | Sep 8 | no data | Sep 10 |
| 2000 | May 19 | Sep 21 | Apr 25 | Sep 24 |
| 1999 | May 17 | Sep 28 | May 12 | Sep 29 |
| 1998 | May 9 | Oct 5 | Apr 22 | Oct 5 |
| 1997 | no data | Oct 9 | no data | Oct 12 |
| 1996 | Apr 29 | Sep 19 | Apr 29 | Sep 26 |
| 1995 | May 27 | Sep 20 | May 1 | Sep 20 |
| 1994 | May 4 | Sep 21 | May 3 | Sep 21 |
| 1993 | May 11 | Sep 13 | May 11 | Sep 13 |
| 1992 | Jun 1 | Sep 26 | Apr 26 | Oct 7 |
| 1991 | May 8 | Sep 23 | May 8 | Oct 5 |
| 1990 | May 17 | Oct 8 | May 10 | Oct 8 |
| 1989 | May 26 | Sep 12 | May 1 | Oct 17 |
| 1988 | no data | Sep 29 | no data | Oct 23 |
"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.