Frost history / Whitefish, MT
Whitefish, MT: frost dates by year
Last spring and first fall frost at NOAA station USC00248902, 1987 to 2012, measured from daily minimum temperatures.
Elevation 3,100 ft, 48.408, -114.359. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 21 | Sep 21 |
| Earliest | May 3 (1993) | Aug 24 (1992) |
| Latest | Jul 3 (1999) | Oct 12 (2010) |
| Trend | 3.3 days later per decade | 4.5 days later per decade |
| Years with data | 23 | 25 |
At 28°F (hard freeze) the median last spring date is May 6 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 |
|---|---|---|---|---|
| 2012 | no data | Sep 12 | no data | Oct 4 |
| 2011 | May 18 | Sep 29 | May 2 | Oct 18 |
| 2010 | May 23 | Oct 12 | May 6 | Oct 14 |
| 2009 | Jun 7 | Sep 21 | May 2 | Oct 5 |
| 2008 | Jun 11 | Sep 8 | May 10 | Sep 8 |
| 2007 | May 6 | Sep 30 | Apr 22 | Oct 18 |
| 2006 | May 30 | Sep 1 | May 10 | Oct 11 |
| 2005 | May 24 | Sep 24 | Apr 30 | Sep 25 |
| 2004 | May 13 | no data | May 13 | no data |
| 2003 | May 20 | Oct 4 | May 17 | Oct 25 |
| 2002 | no data | Sep 22 | no data | Sep 28 |
| 2001 | May 30 | Oct 5 | May 6 | Oct 5 |
| 2000 | Jun 1 | Sep 22 | May 13 | Sep 22 |
| 1999 | Jul 3 | Sep 12 | May 11 | Oct 1 |
| 1998 | May 19 | Oct 4 | May 16 | Oct 4 |
| 1997 | May 21 | Sep 20 | Apr 22 | Oct 21 |
| 1996 | May 21 | Sep 23 | May 15 | Sep 23 |
| 1995 | Jun 8 | Sep 21 | May 1 | Sep 21 |
| 1994 | May 3 | Sep 23 | Apr 29 | Oct 8 |
| 1993 | May 3 | Sep 13 | May 3 | Oct 9 |
| 1992 | May 17 | Aug 24 | May 16 | Sep 7 |
| 1991 | May 26 | Sep 19 | May 4 | Oct 4 |
| 1990 | May 20 | Oct 6 | May 9 | Oct 6 |
| 1989 | May 29 | Sep 9 | May 12 | Sep 11 |
| 1988 | May 15 | Aug 29 | May 1 | Oct 10 |
| 1987 | no data | Sep 17 | no data | Sep 17 |
"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.