Frost history / Middle Fork Lodge, ID
Middle Fork Lodge, ID: frost dates by year
Last spring and first fall frost at NOAA station USC00105897, 1971 to 2012, measured from daily minimum temperatures.
Elevation 4,480 ft, 44.719, -115.015. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Jun 9 | Sep 12 |
| Earliest | May 15 (2009) | Aug 17 (1975) |
| Latest | Jul 26 (1986) | Oct 9 (2011) |
| Trend | 3.4 days earlier per decade | 3.6 days later per decade |
| Years with data | 33 | 34 |
At 28°F (hard freeze) the median last spring date is May 14 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 |
|---|---|---|---|---|
| 2012 | Jun 20 | Sep 12 | Jun 7 | Oct 4 |
| 2011 | Jun 4 | Oct 9 | May 17 | Oct 18 |
| 2010 | Jun 18 | Sep 6 | May 21 | Oct 12 |
| 2009 | May 15 | Sep 21 | May 13 | Oct 2 |
| 2008 | Jun 11 | Sep 2 | May 13 | Oct 8 |
| 2007 | May 29 | Sep 24 | May 6 | Sep 30 |
| 2006 | May 30 | Sep 1 | May 10 | Sep 17 |
| 2005 | Jun 13 | Sep 11 | May 1 | Sep 11 |
| 2004 | May 29 | Sep 21 | May 12 | Oct 11 |
| 2003 | May 21 | no data | May 20 | no data |
| 2002 | no data | Sep 21 | no data | Oct 2 |
| 1999 | no data | Sep 5 | no data | Sep 20 |
| 1998 | May 19 | Oct 3 | Apr 27 | Oct 5 |
| 1997 | May 19 | Sep 19 | May 9 | Oct 6 |
| 1996 | Jun 19 | Sep 6 | May 13 | Sep 7 |
| 1995 | Jun 20 | Sep 21 | May 14 | Sep 21 |
| 1994 | Jul 6 | Sep 19 | May 4 | Oct 4 |
| 1993 | Jun 23 | Sep 13 | May 1 | Sep 21 |
| 1992 | Jun 6 | Aug 24 | May 12 | Aug 24 |
| 1991 | Jun 21 | Sep 15 | Jun 21 | Sep 22 |
| 1990 | Jun 13 | Sep 5 | May 9 | Oct 7 |
| 1989 | May 31 | Sep 10 | May 27 | Sep 12 |
| 1988 | Jun 9 | Sep 12 | May 3 | Sep 12 |
| 1987 | Jun 3 | Sep 17 | May 3 | Sep 17 |
| 1986 | Jul 26 | Aug 31 | Jul 26 | Sep 22 |
| 1985 | May 31 | Sep 16 | May 14 | Sep 23 |
| 1984 | no data | Aug 23 | no data | Sep 2 |
| 1983 | Jun 21 | Aug 30 | May 15 | Sep 9 |
| 1982 | Jun 10 | no data | May 30 | no data |
| 1981 | Jul 8 | Sep 14 | May 13 | Sep 21 |
| 1980 | no data | Sep 5 | no data | Oct 10 |
| 1978 | May 31 | Sep 17 | May 25 | Sep 20 |
| 1977 | May 30 | no data | May 30 | no data |
| 1976 | May 30 | Sep 7 | May 15 | Sep 9 |
| 1975 | Jul 2 | Aug 17 | Jun 8 | Sep 20 |
| 1974 | Jun 9 | no data | May 17 | no data |
| 1973 | Jun 20 | no data | May 28 | no data |
| 1972 | no data | Sep 15 | no data | Sep 25 |
| 1971 | no data | Sep 3 | no data | Sep 15 |
"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.