Frost history / Squaw Butte-Northern Great Bas, OR
Squaw Butte-Northern Great Bas, OR: frost dates by year
Last spring and first fall frost at NOAA station USC00358029, 1951 to 2025, measured from daily minimum temperatures.
Elevation 4,660 ft, 43.487, -119.721. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Jun 17 | Sep 17 |
| Earliest | May 11 (2015) | Aug 1 (1963) |
| Latest | Jul 28 (1959) | Oct 22 (2022) |
| Trend | 2.6 days earlier per decade | 4.2 days later per decade |
| Years with data | 46 | 47 |
At 28°F (hard freeze) the median last spring date is May 26 and the median first fall date is Oct 4.
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 | Jun 21 | Oct 9 | Apr 21 | Oct 20 |
| 2023 | Jun 19 | Sep 22 | Apr 24 | Oct 24 |
| 2022 | Jun 13 | Oct 22 | May 21 | Oct 22 |
| 2021 | Jun 6 | Sep 29 | May 8 | Oct 11 |
| 2020 | no data | Oct 14 | no data | Oct 21 |
| 2019 | no data | Sep 29 | no data | Sep 30 |
| 2018 | Jun 10 | no data | Apr 23 | no data |
| 2016 | no data | Oct 1 | no data | Oct 1 |
| 2015 | May 11 | no data | May 7 | no data |
| 2014 | no data | Sep 30 | no data | Oct 27 |
| 2013 | Jun 14 | no data | May 25 | no data |
| 2012 | Jun 10 | Oct 3 | Jun 6 | Oct 17 |
| 2011 | Jun 8 | no data | May 16 | no data |
| 2003 | May 18 | no data | May 12 | no data |
| 2002 | Jun 16 | no data | May 26 | no data |
| 1999 | no data | Aug 31 | no data | Sep 25 |
| 1998 | May 26 | Oct 3 | May 16 | Oct 6 |
| 1997 | no data | Sep 18 | no data | Oct 8 |
| 1995 | no data | Oct 1 | no data | Oct 5 |
| 1994 | no data | Oct 4 | no data | Oct 22 |
| 1993 | Jul 1 | no data | Jun 12 | no data |
| 1992 | Jun 13 | Aug 24 | May 1 | Aug 24 |
| 1991 | Jun 21 | Sep 21 | May 9 | Oct 22 |
| 1990 | Jun 13 | no data | May 16 | no data |
| 1989 | May 29 | Oct 3 | May 19 | Oct 15 |
| 1988 | Jun 29 | Sep 17 | May 30 | Sep 18 |
| 1987 | Jun 1 | no data | May 20 | no data |
| 1986 | no data | Sep 16 | no data | Nov 8 |
| 1981 | Jul 8 | no data | Jun 28 | no data |
| 1980 | Jun 4 | Sep 3 | Jun 2 | Oct 22 |
| 1979 | Jul 2 | Oct 20 | Jun 7 | Oct 30 |
| 1978 | no data | Sep 8 | no data | Oct 22 |
| 1977 | Jun 2 | Sep 22 | May 28 | Oct 31 |
| 1976 | Jul 2 | Oct 4 | May 20 | Oct 17 |
| 1975 | no data | Sep 8 | no data | Oct 7 |
| 1974 | Jul 11 | Sep 27 | May 21 | Oct 4 |
| 1973 | Jul 2 | Oct 1 | Jun 18 | Oct 1 |
| 1972 | Jun 12 | Sep 7 | Jun 12 | Sep 20 |
| 1971 | Jul 10 | Sep 3 | May 30 | Sep 18 |
| 1970 | Jun 30 | Sep 9 | May 30 | Sep 13 |
| 1969 | no data | Aug 5 | no data | Sep 14 |
| 1968 | Jun 29 | Sep 16 | May 16 | Sep 22 |
| 1967 | Jun 3 | no data | May 26 | no data |
| 1966 | no data | Sep 12 | no data | Oct 3 |
| 1965 | Jun 27 | Aug 29 | May 23 | Sep 16 |
| 1964 | Jun 27 | Aug 19 | May 25 | Sep 18 |
| 1963 | Jun 29 | Aug 1 | May 10 | Oct 24 |
| 1962 | Jul 6 | no data | Jun 6 | no data |
| 1961 | May 30 | Sep 6 | May 30 | Sep 22 |
| 1960 | Jun 21 | Aug 27 | Jun 20 | Sep 21 |
| 1959 | Jul 28 | Sep 16 | May 28 | Sep 29 |
| 1958 | May 14 | Sep 20 | May 13 | Sep 20 |
| 1957 | Jul 17 | Sep 19 | Apr 26 | Oct 4 |
| 1956 | Jun 11 | Sep 21 | Jun 5 | Oct 13 |
| 1955 | Jul 7 | Sep 15 | Jun 1 | Sep 21 |
| 1954 | Jun 28 | Sep 11 | Jun 28 | Sep 18 |
| 1953 | Jun 24 | Sep 17 | May 27 | Sep 26 |
| 1952 | Jun 13 | Sep 13 | Jun 12 | Oct 14 |
| 1951 | Jun 8 | Aug 30 | Jun 7 | Sep 11 |
"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.