Frost history / Mullen 21 Nw, NE
Mullen 21 Nw, NE: frost dates by year
Last spring and first fall frost at NOAA station USC00255702, 1954 to 2006, measured from daily minimum temperatures.
Elevation 3,460 ft, 42.251, -101.336. Download the data (JSON) · NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 17 | Sep 20 |
| Earliest | Apr 23 (1987) | Aug 4 (1974) |
| Latest | Jun 15 (1969) | Oct 11 (1986) |
| Trend | 1.0 days earlier per decade | 2.2 days later per decade |
| Years with data | 39 | 40 |
At 28°F (hard freeze) the median last spring date is May 5 and the median first fall date is Sep 29.
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 |
|---|---|---|---|---|
| 2006 | no data | Sep 19 | no data | Sep 19 |
| 2002 | May 24 | Sep 22 | May 24 | Oct 13 |
| 2001 | May 22 | Sep 24 | May 22 | Oct 6 |
| 2000 | May 14 | Sep 24 | Apr 21 | Oct 6 |
| 1999 | May 12 | Sep 13 | Apr 18 | Sep 29 |
| 1998 | May 5 | Oct 7 | May 3 | Oct 12 |
| 1997 | May 25 | Oct 9 | May 12 | Oct 13 |
| 1996 | May 11 | Sep 25 | Apr 29 | Oct 18 |
| 1995 | May 18 | Sep 20 | Apr 27 | Sep 22 |
| 1994 | May 26 | Oct 9 | May 1 | Oct 9 |
| 1993 | May 2 | Sep 14 | Apr 22 | Sep 14 |
| 1992 | May 28 | Sep 28 | May 27 | Sep 28 |
| 1991 | May 6 | Sep 18 | May 6 | Sep 18 |
| 1990 | May 10 | Sep 23 | May 10 | Sep 23 |
| 1989 | May 7 | Sep 11 | May 7 | Sep 13 |
| 1988 | May 9 | Oct 4 | Apr 27 | Oct 11 |
| 1987 | Apr 23 | no data | Apr 22 | no data |
| 1986 | May 17 | Oct 11 | May 7 | Oct 12 |
| 1985 | May 6 | Sep 20 | Apr 9 | Sep 24 |
| 1984 | May 27 | no data | May 8 | no data |
| 1983 | no data | Sep 16 | no data | Sep 20 |
| 1982 | Jun 1 | Sep 20 | Apr 30 | Oct 11 |
| 1981 | no data | Sep 17 | no data | Oct 21 |
| 1979 | May 11 | no data | May 11 | no data |
| 1977 | Apr 25 | no data | Apr 21 | no data |
| 1976 | May 17 | Sep 9 | May 6 | Sep 28 |
| 1975 | May 30 | Sep 12 | May 26 | Sep 24 |
| 1974 | May 12 | Aug 4 | May 12 | Sep 3 |
| 1972 | May 8 | no data | May 7 | no data |
| 1971 | May 25 | Sep 19 | Apr 29 | Oct 9 |
| 1970 | May 3 | Sep 10 | May 1 | Sep 26 |
| 1969 | Jun 15 | Oct 5 | May 11 | Oct 8 |
| 1968 | May 21 | Sep 23 | May 20 | Oct 3 |
| 1967 | May 19 | Sep 27 | May 5 | Sep 27 |
| 1966 | May 24 | Oct 1 | May 13 | Oct 1 |
| 1965 | May 28 | Sep 5 | May 11 | Sep 17 |
| 1964 | May 31 | Sep 20 | Apr 29 | Sep 27 |
| 1963 | May 22 | Sep 29 | May 22 | Oct 28 |
| 1962 | May 2 | Sep 4 | May 1 | Sep 10 |
| 1961 | May 26 | Sep 14 | Apr 28 | Sep 14 |
| 1960 | no data | Sep 12 | no data | Sep 30 |
| 1958 | Apr 30 | no data | Apr 30 | no data |
| 1957 | no data | Sep 20 | no data | Oct 24 |
| 1956 | May 14 | Sep 6 | May 2 | Oct 9 |
| 1955 | no data | Sep 23 | no data | Oct 7 |
| 1954 | 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 1991–2020 frost probabilities.