Frost history / Grizzly Creek Sp, CA
Grizzly Creek Sp, CA: frost dates by year
Last spring and first fall frost at NOAA station USC00043647, 1980 to 2000, measured from daily minimum temperatures.
Elevation 413 ft, 40.486, -123.909. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Mar 20 | Nov 22 |
| Earliest | Jan 20 (1992) | Oct 9 (1985) |
| Latest | Apr 13 (1983) | Dec 25 (1995) |
| Trend | 13.8 days earlier per decade | 4.3 days later per decade |
| Years with data | 21, 2 with no freeze | 21 |
At 28°F (hard freeze) the median last spring date is Jan 24 and the median first fall date is Dec 12.
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 |
|---|---|---|---|---|
| 2000 | none | Nov 11 | none | none |
| 1999 | Apr 6 | Nov 22 | none | none |
| 1998 | none | Dec 5 | none | Dec 21 |
| 1997 | Apr 2 | Dec 19 | none | none |
| 1996 | Feb 27 | Nov 6 | none | none |
| 1995 | Feb 16 | Dec 25 | none | none |
| 1994 | Feb 13 | Nov 3 | none | none |
| 1993 | Mar 1 | Nov 14 | Jan 3 | Nov 24 |
| 1992 | Jan 20 | Nov 10 | none | none |
| 1991 | Apr 12 | Nov 15 | Jan 2 | Nov 30 |
| 1990 | Mar 13 | Nov 2 | Feb 20 | Dec 20 |
| 1989 | Mar 4 | Nov 27 | Feb 8 | none |
| 1988 | Apr 8 | Dec 15 | Feb 3 | none |
| 1987 | Mar 20 | Nov 27 | Jan 18 | Dec 13 |
| 1986 | Mar 25 | Nov 30 | none | none |
| 1985 | Mar 28 | Oct 9 | none | Nov 12 |
| 1984 | Mar 4 | Nov 26 | none | none |
| 1983 | Apr 13 | Nov 27 | none | none |
| 1982 | Apr 9 | Nov 9 | Jan 8 | none |
| 1981 | Mar 17 | Nov 27 | none | none |
| 1980 | Apr 2 | Nov 13 | Jan 31 | Dec 12 |
"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.