Frost history / Chico Univ Farm, CA
Chico Univ Farm, CA: frost dates by year
Last spring and first fall frost at NOAA station USC00041715, 1951 to 2018, measured from daily minimum temperatures.
Elevation 185 ft, 39.691, -121.821. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Mar 28 | Nov 16 |
| Earliest | Jan 29 (2000) | Oct 21 (1996) |
| Latest | Apr 28 (1970) | Dec 16 (1995) |
| Trend | 2.7 days earlier per decade | 0.8 days later per decade |
| Years with data | 40 | 35 |
At 28°F (hard freeze) the median last spring date is Feb 21 and the median first fall date is Dec 6.
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 |
|---|---|---|---|---|
| 2018 | Mar 7 | no data | Mar 6 | no data |
| 2000 | Jan 29 | no data | Jan 6 | no data |
| 1999 | Apr 8 | no data | Feb 11 | no data |
| 1998 | Mar 30 | Nov 9 | none | Dec 5 |
| 1997 | Apr 6 | Dec 9 | Jan 15 | Dec 24 |
| 1996 | Mar 29 | Oct 21 | Feb 26 | none |
| 1995 | Apr 9 | Dec 16 | Feb 15 | none |
| 1994 | Mar 26 | Nov 4 | Feb 14 | Nov 14 |
| 1992 | Feb 3 | Nov 16 | Jan 14 | Dec 18 |
| 1991 | Mar 27 | no data | Jan 30 | no data |
| 1990 | Mar 13 | no data | Feb 19 | no data |
| 1989 | Mar 3 | Nov 28 | Feb 14 | Dec 11 |
| 1988 | Apr 23 | Nov 18 | Feb 5 | Dec 26 |
| 1987 | Mar 22 | Nov 15 | Feb 27 | Dec 14 |
| 1978 | Feb 14 | no data | none | no data |
| 1977 | Mar 31 | Nov 18 | Mar 14 | Nov 18 |
| 1976 | Apr 2 | Nov 27 | Mar 5 | Nov 27 |
| 1975 | Apr 17 | Oct 23 | Feb 21 | Nov 11 |
| 1974 | no data | Nov 29 | no data | Dec 22 |
| 1972 | Apr 13 | Oct 29 | Mar 27 | Dec 5 |
| 1971 | Apr 21 | Oct 28 | Mar 5 | Oct 28 |
| 1970 | Apr 28 | Oct 27 | Jan 28 | Dec 19 |
| 1969 | Mar 19 | Nov 17 | Feb 22 | Nov 17 |
| 1968 | Apr 21 | Nov 26 | Jan 11 | Dec 4 |
| 1967 | Apr 2 | Nov 25 | Jan 7 | Dec 6 |
| 1966 | Mar 20 | Nov 23 | Mar 3 | Dec 26 |
| 1965 | Mar 18 | Nov 28 | Feb 10 | Dec 15 |
| 1964 | Mar 19 | Nov 14 | Mar 8 | Nov 14 |
| 1963 | Mar 15 | Nov 21 | Jan 25 | Dec 7 |
| 1962 | Mar 13 | Nov 29 | Feb 27 | Dec 24 |
| 1961 | Apr 19 | Oct 22 | Jan 20 | Nov 16 |
| 1960 | Mar 10 | Nov 28 | Feb 24 | Dec 30 |
| 1959 | Feb 12 | Nov 15 | Jan 20 | Dec 8 |
| 1958 | Apr 24 | Nov 15 | Mar 7 | Nov 15 |
| 1957 | Mar 23 | Nov 16 | Feb 4 | Dec 2 |
| 1956 | Apr 3 | Oct 24 | Mar 12 | Dec 7 |
| 1955 | Apr 27 | Nov 2 | Apr 2 | Dec 4 |
| 1954 | Mar 13 | Nov 28 | Mar 13 | Nov 30 |
| 1953 | Apr 7 | Nov 18 | Apr 7 | none |
| 1952 | Mar 22 | Nov 16 | Mar 22 | Nov 22 |
| 1951 | Mar 31 | Nov 15 | Mar 11 | 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 to 2020 frost probabilities.