Frost history / Hartline, WA
Hartline, WA: frost dates by year
Last spring and first fall frost at NOAA station USC00453529, 1953 to 2019, measured from daily minimum temperatures.
Elevation 1,906 ft, 47.689, -119.106. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 12 | Oct 3 |
| Earliest | Mar 26 (1990) | Aug 22 (1960) |
| Latest | Jul 14 (1983) | Nov 3 (1986) |
| Trend | 1.8 days earlier per decade | 2.0 days later per decade |
| Years with data | 44 | 43 |
At 28°F (hard freeze) the median last spring date is Apr 26 and the median first fall date is Oct 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 |
|---|---|---|---|---|
| 2019 | May 3 | Sep 30 | Mar 18 | Oct 1 |
| 2018 | no data | Oct 3 | no data | Nov 7 |
| 2017 | May 14 | no data | Apr 15 | no data |
| 2015 | Apr 26 | no data | Apr 26 | no data |
| 2014 | May 10 | Oct 27 | Apr 5 | Nov 11 |
| 2013 | no data | Oct 1 | no data | Oct 29 |
| 2002 | May 8 | no data | May 8 | no data |
| 2000 | May 12 | Sep 22 | May 8 | Nov 2 |
| 1999 | Jun 7 | Sep 28 | May 10 | Oct 27 |
| 1998 | May 16 | no data | Apr 13 | no data |
| 1996 | May 8 | no data | May 8 | no data |
| 1995 | Apr 19 | no data | Apr 17 | no data |
| 1994 | no data | Oct 23 | no data | Oct 31 |
| 1993 | Apr 6 | Oct 18 | Mar 17 | Nov 5 |
| 1992 | no data | Oct 7 | no data | Oct 14 |
| 1991 | Jun 17 | Oct 18 | Apr 26 | Oct 22 |
| 1990 | Mar 26 | Oct 7 | Mar 26 | Oct 8 |
| 1989 | May 24 | no data | Apr 4 | no data |
| 1988 | May 2 | Sep 17 | May 2 | Sep 18 |
| 1987 | May 19 | Oct 20 | May 19 | Nov 17 |
| 1986 | May 14 | Nov 3 | Apr 30 | Nov 6 |
| 1985 | May 4 | Oct 6 | Apr 23 | Oct 8 |
| 1984 | May 31 | Sep 23 | May 31 | Oct 18 |
| 1983 | Jul 14 | Sep 19 | Apr 15 | Nov 4 |
| 1982 | May 4 | Oct 7 | May 4 | Oct 19 |
| 1981 | May 8 | Sep 29 | May 3 | Oct 2 |
| 1980 | Apr 10 | Oct 23 | Apr 7 | Oct 27 |
| 1979 | May 7 | Oct 20 | Apr 21 | Nov 1 |
| 1978 | May 23 | Oct 13 | Apr 23 | Oct 25 |
| 1977 | May 29 | Sep 22 | May 27 | Oct 26 |
| 1976 | Jun 2 | Oct 19 | Jun 1 | Oct 19 |
| 1975 | May 19 | Oct 8 | Apr 21 | Oct 24 |
| 1974 | May 16 | Oct 3 | May 16 | Oct 5 |
| 1973 | May 11 | Oct 2 | May 9 | Oct 3 |
| 1972 | Apr 30 | Sep 19 | Apr 29 | Sep 21 |
| 1971 | Apr 28 | Oct 13 | Apr 11 | Oct 26 |
| 1970 | May 12 | Sep 13 | May 9 | Oct 6 |
| 1969 | Apr 26 | Oct 12 | Mar 23 | Oct 12 |
| 1968 | May 5 | Sep 18 | Apr 21 | Oct 30 |
| 1967 | May 29 | Oct 23 | Apr 30 | Oct 24 |
| 1962 | Jun 4 | Oct 5 | May 4 | Oct 7 |
| 1961 | May 11 | Sep 24 | Apr 21 | Oct 8 |
| 1960 | May 22 | Aug 22 | May 22 | Oct 29 |
| 1959 | Jun 10 | Oct 7 | May 4 | Oct 10 |
| 1958 | May 13 | Sep 24 | Mar 18 | Sep 24 |
| 1957 | Apr 26 | Sep 19 | Mar 28 | Sep 19 |
| 1956 | May 13 | Oct 13 | Apr 6 | Oct 22 |
| 1955 | no data | Sep 30 | no data | Oct 6 |
| 1954 | no data | Oct 1 | no data | Oct 12 |
| 1953 | May 22 | Sep 29 | May 22 | Oct 2 |
"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.