Frost history / Harrison 4NW, NE
Harrison 4NW, NE: frost dates by year
Last spring and first fall frost at NOAA station USC00253617, 2005 to 2016, measured from daily minimum temperatures.
Elevation 5,073 ft, 42.743, -103.922. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 15 | Oct 1 |
| Earliest | May 11 (2013) | Sep 11 (2014) |
| Latest | Jun 8 (2009) | Oct 18 (2011) |
| Trend | 13.3 days earlier per decade | 6.5 days later per decade |
| Years with data | 10 | 10 |
At 28°F (hard freeze) the median last spring date is May 11 and the median first fall date is Oct 5.
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 |
|---|---|---|---|---|
| 2016 | no data | Oct 5 | no data | Oct 5 |
| 2015 | no data | Oct 16 | no data | Oct 29 |
| 2014 | May 13 | Sep 11 | May 1 | Sep 12 |
| 2013 | May 11 | Sep 27 | May 11 | Oct 5 |
| 2012 | May 12 | Oct 4 | May 12 | Oct 4 |
| 2011 | May 16 | Oct 18 | May 3 | Oct 26 |
| 2010 | May 14 | Sep 18 | May 13 | Oct 25 |
| 2009 | Jun 8 | no data | May 16 | no data |
| 2008 | May 27 | no data | May 11 | no data |
| 2007 | Jun 8 | Sep 25 | Apr 14 | Oct 16 |
| 2006 | May 16 | Sep 19 | May 10 | Sep 28 |
| 2005 | May 12 | Oct 5 | May 12 | Oct 5 |
"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.