Frost history / Ukiah, CA
Ukiah, CA: frost dates by year
Last spring and first fall frost at NOAA station USC00049122, 1951 to 2009, measured from daily minimum temperatures.
Elevation 636 ft, 39.147, -123.210. Download the data (JSON) · NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Mar 23 | Nov 16 |
| Earliest | Jan 29 (2000) | Oct 14 (1966) |
| Latest | May 25 (1995) | Dec 23 (1995) |
| Trend | 4.8 days earlier per decade | 2.9 days later per decade |
| Years with data | 54 | 51 |
At 28°F (hard freeze) the median last spring date is Feb 8 and the median first fall date is Nov 30.
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 |
|---|---|---|---|---|
| 2009 | Apr 4 | no data | Mar 13 | no data |
| 2007 | Feb 28 | Nov 21 | Feb 18 | Dec 1 |
| 2006 | Mar 13 | Nov 12 | Feb 21 | Nov 29 |
| 2005 | no data | Nov 27 | no data | Dec 6 |
| 2004 | no data | Nov 20 | no data | Nov 29 |
| 2003 | Feb 28 | Nov 22 | Feb 8 | Nov 23 |
| 2002 | Mar 18 | no data | Mar 18 | no data |
| 2001 | Apr 8 | no data | Feb 14 | no data |
| 2000 | Jan 29 | Nov 10 | none | Nov 12 |
| 1999 | Apr 9 | no data | Feb 11 | no data |
| 1998 | Mar 6 | Dec 4 | none | Dec 5 |
| 1997 | Mar 7 | Dec 9 | Jan 14 | Dec 22 |
| 1996 | Mar 6 | Dec 2 | Feb 26 | none |
| 1995 | May 25 | Dec 23 | Mar 24 | none |
| 1994 | Mar 23 | Nov 3 | none | Nov 19 |
| 1993 | Feb 28 | Nov 14 | Jan 3 | Nov 23 |
| 1992 | Feb 5 | Nov 10 | Jan 12 | Dec 5 |
| 1991 | Mar 27 | Nov 15 | Jan 30 | Nov 30 |
| 1990 | Mar 13 | Nov 7 | Feb 20 | Dec 4 |
| 1989 | Mar 3 | no data | Feb 15 | no data |
| 1988 | Mar 13 | Nov 18 | Feb 4 | Dec 26 |
| 1987 | Mar 20 | Nov 26 | Feb 25 | Dec 13 |
| 1986 | Mar 14 | Nov 27 | none | none |
| 1984 | Feb 22 | Nov 26 | Jan 14 | Dec 16 |
| 1983 | Apr 11 | no data | Jan 20 | no data |
| 1982 | Apr 8 | Nov 10 | Feb 6 | Dec 24 |
| 1981 | Feb 6 | Nov 28 | none | none |
| 1980 | Mar 16 | Nov 12 | Jan 30 | Dec 7 |
| 1979 | Feb 18 | Nov 20 | Feb 3 | Dec 12 |
| 1978 | Apr 22 | Nov 11 | Jan 24 | Nov 11 |
| 1977 | May 7 | Nov 4 | Mar 14 | Nov 19 |
| 1976 | no data | Nov 28 | no data | Nov 28 |
| 1975 | Apr 17 | Oct 23 | Feb 21 | Nov 17 |
| 1974 | Mar 8 | Nov 22 | Feb 23 | Dec 23 |
| 1973 | Mar 22 | Nov 3 | Jan 26 | none |
| 1972 | Apr 18 | Oct 29 | Feb 2 | Oct 30 |
| 1971 | Mar 31 | Oct 18 | Mar 5 | Oct 28 |
| 1970 | Apr 28 | Oct 27 | Jan 6 | Dec 19 |
| 1969 | Apr 13 | Nov 17 | Jan 31 | Nov 30 |
| 1968 | Apr 17 | Nov 26 | Jan 28 | Dec 20 |
| 1967 | Apr 30 | Nov 25 | Mar 4 | Dec 12 |
| 1966 | Mar 17 | Oct 14 | Mar 17 | Nov 24 |
| 1965 | May 3 | Nov 28 | Jan 8 | Dec 14 |
| 1964 | Apr 26 | Nov 14 | Mar 7 | Nov 14 |
| 1963 | Apr 21 | Nov 16 | Jan 21 | Dec 10 |
| 1962 | Mar 24 | Nov 29 | Feb 28 | Nov 29 |
| 1961 | Apr 19 | Nov 13 | Jan 6 | Nov 16 |
| 1960 | Mar 14 | Nov 27 | Jan 17 | Dec 7 |
| 1959 | Feb 24 | Nov 6 | Feb 8 | Nov 29 |
| 1958 | Apr 6 | Nov 15 | Jan 8 | Nov 16 |
| 1957 | Mar 23 | Nov 3 | Feb 5 | Nov 29 |
| 1956 | Mar 12 | Oct 24 | Mar 12 | Nov 20 |
| 1955 | Apr 27 | Nov 2 | Mar 16 | Dec 28 |
| 1954 | Mar 17 | Oct 24 | Jan 25 | Dec 11 |
| 1953 | Apr 9 | Nov 18 | Mar 2 | Dec 22 |
| 1952 | Mar 22 | Nov 16 | Mar 13 | Nov 24 |
| 1951 | Mar 31 | Nov 16 | Mar 10 | Dec 7 |
"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.