Frost history / Lava Beds Nat Mon, CA
Lava Beds Nat Mon, CA: frost dates by year
Last spring and first fall frost at NOAA station USC00044838, 1960 to 2025, measured from daily minimum temperatures.
Elevation 4,770 ft, 41.702, -121.501. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Jun 3 | Sep 18 |
| Earliest | May 5 (2025) | Aug 17 (1972) |
| Latest | Jul 22 (1965) | Oct 14 (2021) |
| Trend | 3.0 days earlier per decade | 0.7 days later per decade |
| Years with data | 41 | 37 |
At 28°F (hard freeze) the median last spring date is May 12 and the median first fall date is Oct 9.
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 |
|---|---|---|---|---|
| 2025 | May 5 | no data | Apr 13 | no data |
| 2024 | May 24 | no data | May 8 | no data |
| 2021 | no data | Oct 14 | no data | Oct 19 |
| 2019 | no data | Sep 17 | no data | Sep 29 |
| 2015 | May 14 | no data | Apr 24 | no data |
| 2014 | May 29 | no data | Apr 28 | no data |
| 2011 | Jun 3 | no data | Jun 3 | no data |
| 2008 | Jun 7 | no data | May 1 | no data |
| 2007 | Jun 6 | no data | May 22 | no data |
| 2006 | May 29 | Sep 15 | Apr 19 | Oct 10 |
| 2005 | Jun 17 | Sep 24 | Apr 19 | Oct 27 |
| 2004 | May 28 | Sep 21 | Apr 22 | Oct 18 |
| 2003 | May 19 | Sep 17 | May 18 | Oct 13 |
| 2002 | Jun 9 | Sep 29 | Jun 8 | Oct 1 |
| 2001 | Jun 27 | Sep 6 | Jun 3 | Oct 9 |
| 2000 | Jun 1 | Sep 23 | May 31 | Sep 23 |
| 1999 | no data | Aug 31 | no data | Oct 15 |
| 1998 | May 27 | no data | Apr 17 | no data |
| 1997 | Jun 22 | Sep 16 | May 2 | Oct 7 |
| 1996 | Jun 18 | Sep 5 | May 23 | Sep 22 |
| 1995 | Jun 19 | Oct 4 | May 12 | Oct 4 |
| 1994 | Jun 14 | Oct 3 | Apr 10 | Oct 3 |
| 1993 | Jun 24 | no data | Jun 24 | no data |
| 1992 | May 21 | no data | May 1 | no data |
| 1990 | Jun 1 | no data | May 9 | no data |
| 1989 | May 29 | Sep 18 | May 23 | Oct 30 |
| 1988 | Jun 30 | no data | May 30 | no data |
| 1987 | no data | Sep 16 | no data | Nov 10 |
| 1986 | May 22 | no data | May 22 | no data |
| 1985 | May 30 | Sep 11 | May 30 | Oct 9 |
| 1984 | no data | Sep 6 | no data | Oct 13 |
| 1983 | no data | Aug 23 | no data | Oct 15 |
| 1982 | Jun 6 | no data | May 10 | no data |
| 1981 | Jun 15 | Sep 29 | May 16 | Oct 7 |
| 1977 | no data | Sep 22 | no data | Nov 3 |
| 1976 | Jul 1 | Oct 3 | May 11 | Oct 26 |
| 1975 | no data | Oct 7 | no data | Oct 22 |
| 1974 | no data | Oct 4 | no data | Oct 5 |
| 1973 | Jun 18 | no data | Jun 18 | no data |
| 1972 | Jun 11 | Aug 17 | Jun 11 | Sep 25 |
| 1971 | Jun 1 | Sep 3 | May 17 | Sep 29 |
| 1970 | May 23 | Sep 13 | May 12 | Sep 13 |
| 1969 | May 15 | Oct 3 | May 2 | Oct 4 |
| 1968 | May 25 | Sep 20 | May 15 | Sep 21 |
| 1967 | Jun 2 | Oct 3 | May 12 | Oct 14 |
| 1966 | Jul 3 | Sep 12 | Jun 4 | Oct 13 |
| 1965 | Jul 22 | Sep 10 | Jun 27 | Sep 17 |
| 1964 | no data | Aug 28 | no data | Oct 17 |
| 1963 | Jun 29 | Sep 17 | May 9 | Oct 27 |
| 1962 | Jun 5 | Oct 5 | Jun 4 | Oct 11 |
| 1961 | May 27 | Sep 23 | May 5 | Sep 29 |
| 1960 | no data | Sep 21 | no data | Oct 9 |
"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.