Frost history / Nampa Sugar Factory, ID
Nampa Sugar Factory, ID: frost dates by year
Last spring and first fall frost at NOAA station USC00106305, 1977 to 2015, measured from daily minimum temperatures.
Elevation 2,470 ft, 43.604, -116.575. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 5 | Oct 11 |
| Earliest | Apr 15 (1994) | Sep 19 (1978) |
| Latest | May 28 (2007) | Nov 9 (2010) |
| Trend | 0.9 days earlier per decade | 5.2 days later per decade |
| Years with data | 33 | 31 |
At 28°F (hard freeze) the median last spring date is Apr 14 and the median first fall date is Oct 25.
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 |
|---|---|---|---|---|
| 2015 | Apr 27 | no data | Apr 16 | no data |
| 2014 | May 9 | Nov 8 | Mar 25 | Nov 11 |
| 2013 | May 23 | no data | Apr 14 | no data |
| 2012 | May 8 | Oct 7 | Apr 7 | Oct 26 |
| 2011 | May 2 | Oct 26 | Apr 24 | Oct 26 |
| 2010 | May 7 | Nov 9 | Apr 11 | Nov 9 |
| 2009 | Apr 17 | Oct 2 | Apr 4 | Oct 12 |
| 2008 | May 2 | Oct 11 | Apr 27 | Oct 22 |
| 2007 | May 28 | Oct 18 | Apr 11 | Oct 31 |
| 2006 | Apr 19 | Oct 21 | Mar 21 | Oct 30 |
| 2005 | Apr 15 | no data | Apr 14 | no data |
| 2004 | Apr 16 | Oct 25 | Mar 7 | Oct 25 |
| 2003 | May 19 | Oct 14 | Apr 7 | Oct 30 |
| 2002 | May 8 | Oct 12 | May 8 | Oct 12 |
| 2001 | May 3 | Oct 10 | May 3 | Oct 10 |
| 2000 | no data | Oct 23 | no data | Nov 2 |
| 1999 | May 11 | Sep 28 | May 11 | Oct 17 |
| 1998 | Apr 20 | Oct 6 | Apr 15 | Oct 17 |
| 1997 | no data | Oct 8 | no data | Oct 25 |
| 1996 | May 4 | no data | Apr 22 | no data |
| 1995 | no data | Sep 22 | no data | Oct 19 |
| 1994 | Apr 15 | Oct 22 | Mar 28 | Oct 24 |
| 1993 | May 9 | Oct 10 | Mar 12 | Oct 27 |
| 1992 | Apr 25 | Oct 25 | Apr 7 | Nov 6 |
| 1991 | Apr 30 | Oct 18 | Apr 15 | Oct 30 |
| 1990 | May 9 | Oct 7 | Mar 29 | Oct 8 |
| 1989 | May 19 | Oct 16 | Mar 30 | Oct 16 |
| 1988 | May 3 | Oct 30 | Apr 10 | Nov 7 |
| 1987 | Apr 21 | Oct 11 | Apr 20 | Nov 15 |
| 1986 | May 5 | Oct 11 | Apr 30 | Oct 12 |
| 1985 | May 13 | no data | Apr 20 | no data |
| 1984 | May 7 | Sep 23 | Apr 28 | Sep 25 |
| 1983 | May 12 | Sep 21 | Apr 11 | Oct 24 |
| 1982 | May 19 | Oct 5 | Apr 22 | Oct 10 |
| 1979 | Apr 26 | Oct 26 | Apr 21 | Oct 30 |
| 1978 | no data | Sep 19 | no data | Oct 13 |
| 1977 | May 11 | no data | Apr 20 | no data |
"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.