Frost history / Stratton, CO
Stratton, CO: frost dates by year
Last spring and first fall frost at NOAA station USC00058008, 1951 to 2008, measured from daily minimum temperatures.
Elevation 4,399 ft, 39.305, -102.600. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 6 | Oct 4 |
| Earliest | Apr 22 (1974) | Sep 15 (1961) |
| Latest | Jun 2 (1951) | Oct 27 (1963) |
| Trend | little change (less than half a day per decade) | little change (less than half a day per decade) |
| Years with data | 40 | 41 |
At 28°F (hard freeze) the median last spring date is Apr 27 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 |
|---|---|---|---|---|
| 2008 | no data | Oct 23 | no data | Oct 23 |
| 2001 | May 21 | Oct 5 | Apr 18 | Oct 25 |
| 2000 | no data | Sep 24 | no data | Oct 6 |
| 1999 | Apr 24 | Sep 29 | Apr 18 | Oct 2 |
| 1998 | Apr 30 | Oct 5 | Apr 29 | Nov 8 |
| 1997 | May 10 | no data | May 3 | no data |
| 1996 | May 1 | Oct 18 | Apr 30 | Oct 18 |
| 1995 | May 14 | Sep 21 | Apr 23 | Oct 20 |
| 1994 | May 1 | Sep 22 | Apr 28 | Oct 25 |
| 1993 | May 3 | Sep 15 | May 3 | Oct 9 |
| 1992 | May 26 | Oct 7 | Apr 26 | Oct 8 |
| 1991 | May 6 | Oct 5 | May 1 | Oct 5 |
| 1987 | Apr 23 | Oct 7 | Apr 21 | Oct 10 |
| 1985 | May 13 | no data | Apr 27 | no data |
| 1982 | May 6 | no data | Apr 22 | no data |
| 1981 | no data | Oct 18 | no data | Oct 25 |
| 1979 | May 11 | no data | May 10 | no data |
| 1978 | no data | Oct 5 | no data | Oct 14 |
| 1977 | Apr 22 | Oct 2 | Apr 9 | Oct 11 |
| 1976 | May 17 | Sep 29 | Apr 25 | Oct 16 |
| 1975 | May 8 | Sep 22 | Apr 27 | Oct 15 |
| 1974 | Apr 22 | Sep 30 | Apr 16 | Oct 15 |
| 1973 | May 2 | Oct 11 | Apr 21 | Oct 27 |
| 1972 | May 3 | Oct 18 | Apr 3 | Oct 24 |
| 1971 | May 12 | Sep 17 | Apr 9 | Oct 9 |
| 1970 | May 15 | Sep 26 | May 2 | Oct 7 |
| 1969 | Apr 28 | Oct 5 | Apr 27 | Oct 12 |
| 1968 | May 17 | Oct 6 | Apr 23 | Oct 18 |
| 1967 | May 4 | Sep 27 | May 2 | Oct 16 |
| 1966 | May 13 | Oct 1 | May 13 | Oct 15 |
| 1965 | May 10 | Sep 17 | May 10 | Nov 4 |
| 1964 | May 5 | Sep 27 | Apr 18 | Oct 5 |
| 1963 | Apr 30 | Oct 27 | Apr 24 | Nov 1 |
| 1962 | May 3 | Oct 16 | May 1 | Oct 16 |
| 1961 | May 14 | Sep 15 | Apr 28 | Sep 30 |
| 1960 | May 1 | Oct 15 | Apr 30 | Oct 30 |
| 1959 | May 6 | Sep 29 | Apr 22 | Oct 11 |
| 1958 | no data | Oct 1 | no data | Oct 10 |
| 1957 | May 17 | Sep 22 | Apr 14 | Oct 24 |
| 1956 | Apr 30 | Oct 20 | Apr 30 | Oct 25 |
| 1955 | Apr 28 | Oct 23 | Apr 28 | Oct 23 |
| 1954 | May 4 | Oct 14 | May 3 | Oct 15 |
| 1953 | May 14 | Oct 4 | May 13 | Oct 25 |
| 1952 | Apr 23 | Oct 5 | Apr 14 | Oct 6 |
| 1951 | Jun 2 | Sep 21 | Apr 22 | Oct 17 |
"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.