Frost history / Alkali Lake, OR
Alkali Lake, OR: frost dates by year
Last spring and first fall frost at NOAA station USC00350118, 1961 to 2025, measured from daily minimum temperatures.
Elevation 4,332 ft, 42.969, -119.993. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Jun 23 | Sep 3 |
| Earliest | May 26 (1964) | Aug 1 (1995) |
| Latest | Jul 21 (1972) | Oct 20 (1979) |
| Trend | 0.7 days earlier per decade | 2.0 days later per decade |
| Years with data | 32 | 36 |
At 28°F (hard freeze) the median last spring date is May 22 and the median first fall date is Sep 21.
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 | no data | Oct 6 | no data | Oct 15 |
| 2024 | Jun 18 | Aug 28 | May 21 | Sep 30 |
| 2023 | Jun 21 | Sep 20 | Apr 25 | Sep 28 |
| 2022 | Jun 14 | Sep 17 | May 20 | Oct 20 |
| 2021 | Jun 6 | no data | May 10 | no data |
| 2020 | Jul 2 | Sep 19 | Jun 6 | Sep 27 |
| 2019 | no data | Sep 28 | no data | Oct 1 |
| 2017 | no data | Sep 15 | no data | Sep 21 |
| 2016 | Jun 18 | Sep 5 | May 9 | Sep 13 |
| 2015 | no data | Sep 6 | no data | Sep 18 |
| 2014 | no data | Sep 3 | no data | Sep 30 |
| 1995 | no data | Aug 1 | no data | Sep 22 |
| 1994 | Jun 16 | Sep 14 | May 1 | Oct 3 |
| 1993 | Jun 24 | Aug 25 | May 8 | Sep 20 |
| 1992 | Jun 19 | Aug 23 | May 22 | Sep 8 |
| 1991 | Jun 17 | Sep 17 | May 10 | Sep 21 |
| 1990 | Jun 15 | Sep 1 | May 25 | Oct 6 |
| 1986 | Jul 17 | Sep 10 | May 22 | Sep 10 |
| 1985 | Jun 25 | Sep 3 | May 15 | Sep 28 |
| 1983 | Jun 24 | no data | May 12 | no data |
| 1981 | Jun 14 | Sep 22 | May 12 | Sep 29 |
| 1980 | Jun 4 | Sep 3 | Jun 2 | Oct 9 |
| 1979 | Jul 3 | Oct 20 | May 29 | Oct 28 |
| 1976 | Jul 1 | Aug 26 | Jun 26 | Sep 7 |
| 1975 | Jun 7 | Aug 31 | Jun 6 | Oct 14 |
| 1974 | Jun 26 | Aug 20 | Jun 8 | Sep 27 |
| 1973 | Jul 1 | Aug 26 | Jun 18 | Sep 1 |
| 1972 | Jul 21 | no data | May 25 | no data |
| 1971 | Jun 11 | Aug 23 | May 20 | Sep 7 |
| 1970 | Jun 30 | Sep 12 | May 14 | Sep 12 |
| 1969 | May 29 | Aug 29 | May 29 | Aug 29 |
| 1968 | Jun 30 | Aug 15 | May 15 | Sep 22 |
| 1967 | Jun 3 | Sep 12 | May 25 | Sep 12 |
| 1966 | Jul 3 | Sep 12 | May 23 | Sep 12 |
| 1965 | Jun 27 | Aug 29 | May 18 | Sep 17 |
| 1964 | May 26 | Aug 27 | May 26 | Aug 29 |
| 1963 | Jun 29 | Oct 4 | May 10 | Oct 7 |
| 1962 | Jul 2 | Aug 27 | Jun 4 | Sep 9 |
| 1961 | no data | Sep 3 | no data | Sep 8 |
"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.