Frost history / Prineville, OR
Prineville, OR: frost dates by year
Last spring and first fall frost at NOAA station USC00356883, 1951 to 2023, measured from daily minimum temperatures.
Elevation 2,876 ft, 44.301, -120.841. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Jun 27 | Sep 2 |
| Earliest | Apr 25 (2023) | Aug 1 (1957) |
| Latest | Jul 30 (1954) | Oct 17 (2022) |
| Trend | 6.3 days earlier per decade | 6.8 days later per decade |
| Years with data | 58 | 58 |
At 28°F (hard freeze) the median last spring date is May 24 and the median first fall date is Sep 16.
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 |
|---|---|---|---|---|
| 2023 | Apr 25 | Sep 23 | Apr 20 | Oct 2 |
| 2022 | May 30 | Oct 17 | May 20 | Oct 27 |
| 2021 | May 8 | Oct 7 | Apr 27 | Oct 7 |
| 2020 | Jun 7 | Oct 15 | May 7 | Oct 22 |
| 2019 | May 3 | Oct 1 | May 1 | Oct 2 |
| 2018 | May 2 | Sep 24 | Apr 23 | Oct 5 |
| 2016 | Jun 15 | Oct 3 | Apr 5 | Oct 3 |
| 2015 | no data | Sep 15 | no data | Nov 4 |
| 2014 | Jul 25 | no data | Jul 21 | no data |
| 2013 | May 25 | Sep 26 | May 22 | Oct 2 |
| 2012 | May 26 | Oct 4 | May 10 | Oct 21 |
| 2011 | Jun 16 | Oct 7 | May 3 | Oct 25 |
| 2010 | Jun 15 | Sep 4 | May 23 | Oct 5 |
| 2009 | no data | Sep 30 | no data | Sep 30 |
| 1999 | Jun 27 | Aug 31 | May 22 | Sep 4 |
| 1998 | May 28 | Sep 10 | May 28 | Oct 5 |
| 1997 | Jun 23 | Sep 19 | May 8 | Sep 20 |
| 1996 | Jul 19 | Sep 3 | Jun 19 | Sep 18 |
| 1995 | Jun 9 | Aug 18 | May 19 | Sep 22 |
| 1994 | Jun 19 | Sep 13 | May 2 | Oct 3 |
| 1993 | Jun 24 | Aug 26 | Jun 12 | Sep 13 |
| 1992 | May 22 | Aug 24 | May 21 | Aug 24 |
| 1991 | Jun 17 | Sep 8 | Jun 14 | Sep 15 |
| 1990 | Jun 13 | Sep 21 | May 25 | Oct 6 |
| 1989 | Jun 16 | Sep 4 | May 28 | Sep 10 |
| 1988 | Jul 6 | Aug 21 | May 30 | Sep 12 |
| 1987 | Jul 20 | no data | May 21 | no data |
| 1986 | Jul 15 | Sep 10 | May 22 | Oct 2 |
| 1985 | Jun 25 | Aug 9 | May 15 | Sep 18 |
| 1984 | Jul 7 | Aug 20 | Jun 8 | Sep 12 |
| 1983 | Jul 11 | Sep 5 | May 13 | Sep 9 |
| 1982 | Jul 22 | Sep 11 | May 30 | Sep 15 |
| 1981 | Jul 12 | Aug 27 | Jun 14 | Sep 23 |
| 1980 | Jun 4 | Aug 15 | Jun 4 | Aug 21 |
| 1979 | no data | Sep 10 | no data | Oct 3 |
| 1978 | Jul 16 | Sep 8 | May 31 | Sep 8 |
| 1977 | Jul 5 | Sep 1 | May 18 | Sep 9 |
| 1976 | Jun 27 | Sep 7 | Jun 27 | Sep 7 |
| 1975 | Jun 29 | Aug 24 | May 26 | Sep 21 |
| 1974 | Jun 26 | Aug 20 | May 30 | Sep 13 |
| 1973 | Jul 12 | Aug 18 | Jun 18 | Sep 1 |
| 1972 | May 25 | Aug 31 | May 24 | Sep 22 |
| 1971 | Jul 7 | Aug 23 | May 30 | Sep 14 |
| 1970 | Jun 30 | Sep 2 | May 28 | Sep 9 |
| 1969 | Jun 26 | Aug 5 | May 15 | Aug 29 |
| 1968 | Jun 29 | no data | May 12 | no data |
| 1967 | Jul 28 | Aug 24 | May 26 | Sep 12 |
| 1966 | Jun 25 | no data | May 23 | no data |
| 1965 | Jul 12 | Aug 29 | Jun 1 | Aug 30 |
| 1964 | no data | Aug 19 | no data | Sep 3 |
| 1962 | Jul 15 | Aug 22 | Jun 5 | Sep 12 |
| 1961 | Jun 30 | Sep 3 | May 27 | Sep 6 |
| 1960 | Jul 2 | Aug 13 | Jun 21 | Aug 22 |
| 1959 | Jul 29 | Aug 6 | May 30 | Sep 9 |
| 1958 | May 14 | Sep 2 | May 13 | Sep 20 |
| 1957 | Jul 17 | Aug 1 | May 3 | Sep 19 |
| 1956 | Jun 30 | Aug 30 | May 13 | Sep 2 |
| 1955 | Jul 7 | Aug 3 | Jun 16 | Sep 18 |
| 1954 | Jul 30 | Aug 9 | May 28 | Sep 5 |
| 1953 | Jul 23 | Sep 17 | Jun 5 | Sep 17 |
| 1952 | Jul 7 | Aug 19 | May 9 | Sep 13 |
| 1951 | Jun 8 | Aug 12 | May 30 | Sep 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.