Frost history / Malheur Refuge Hq, OR
Malheur Refuge Hq, OR: frost dates by year
Last spring and first fall frost at NOAA station USC00355162, 1959 to 2025, measured from daily minimum temperatures.
Elevation 4,118 ft, 43.265, -118.845. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Jun 12 | Sep 3 |
| Earliest | May 14 (1970) | Aug 14 (1995) |
| Latest | Jul 20 (1968) | Oct 2 (2012) |
| Trend | little change (less than half a day per decade) | 2.7 days later per decade |
| Years with data | 27 | 28 |
At 28°F (hard freeze) the median last spring date is May 12 and the median first fall date is Sep 19.
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 14 | no data | Apr 21 | no data |
| 2024 | Jun 17 | Sep 29 | May 7 | Sep 29 |
| 2013 | Jun 13 | no data | May 21 | no data |
| 2012 | no data | Oct 2 | no data | Oct 3 |
| 2010 | Jun 17 | Sep 6 | May 23 | Oct 12 |
| 2009 | no data | Sep 8 | no data | Oct 2 |
| 2008 | no data | Sep 24 | no data | Oct 8 |
| 1997 | Jun 24 | no data | May 1 | no data |
| 1996 | Jun 19 | Aug 19 | Jun 19 | Sep 6 |
| 1995 | no data | Aug 14 | no data | Aug 18 |
| 1994 | Jun 8 | Sep 5 | Jun 8 | Oct 4 |
| 1993 | Jun 23 | Aug 27 | May 7 | Sep 21 |
| 1992 | Jun 14 | Aug 24 | May 12 | Aug 24 |
| 1985 | Jun 2 | no data | May 5 | no data |
| 1983 | May 17 | Sep 10 | May 12 | Sep 20 |
| 1982 | Jun 9 | Sep 11 | May 11 | Sep 11 |
| 1981 | Jun 14 | Sep 2 | May 8 | Sep 20 |
| 1980 | no data | Aug 29 | no data | Sep 22 |
| 1978 | no data | Aug 18 | no data | Sep 19 |
| 1973 | Jun 18 | no data | Jun 18 | no data |
| 1972 | Jun 12 | Sep 7 | May 1 | Sep 7 |
| 1971 | May 20 | Aug 23 | May 20 | Sep 15 |
| 1970 | May 14 | Sep 9 | May 14 | Sep 9 |
| 1969 | May 28 | Aug 29 | May 3 | Aug 29 |
| 1968 | Jul 20 | Sep 3 | May 7 | Sep 20 |
| 1967 | Jun 2 | Sep 12 | May 13 | Sep 14 |
| 1966 | Jun 2 | Aug 30 | May 15 | Aug 30 |
| 1965 | May 17 | Aug 30 | May 17 | Sep 17 |
| 1964 | Jun 20 | Aug 27 | May 23 | Aug 29 |
| 1963 | May 16 | Aug 25 | Apr 24 | Oct 13 |
| 1962 | Jul 5 | no data | Jun 4 | no data |
| 1961 | May 27 | Sep 3 | May 4 | Sep 12 |
| 1960 | Jun 21 | Aug 25 | May 23 | Sep 21 |
| 1959 | no data | Sep 16 | no data | Sep 29 |
"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.