Frost history / Pine Bluffs 5W, WY
Pine Bluffs 5W, WY: frost dates by year
Last spring and first fall frost at NOAA station USC00487240, 1988 to 2009, measured from daily minimum temperatures.
Elevation 5,180 ft, 41.172, -104.158. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 19 | Sep 21 |
| Earliest | Apr 26 (1992) | Sep 9 (2001) |
| Latest | Jun 22 (1989) | Oct 10 (2004) |
| Trend | 1.6 days later per decade | 0.6 days later per decade |
| Years with data | 21 | 20 |
At 28°F (hard freeze) the median last spring date is May 6 and the median first fall date is Oct 2.
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 |
|---|---|---|---|---|
| 2009 | May 14 | no data | Apr 14 | no data |
| 2008 | May 14 | no data | May 14 | no data |
| 2007 | Jun 8 | Sep 11 | Apr 20 | Oct 9 |
| 2006 | May 16 | Sep 17 | May 16 | Sep 17 |
| 2005 | May 28 | Sep 29 | May 28 | Oct 6 |
| 2004 | Jun 1 | Oct 10 | May 14 | Oct 26 |
| 2003 | May 20 | Sep 18 | Apr 21 | Sep 18 |
| 2002 | May 25 | Sep 22 | May 13 | Oct 12 |
| 2001 | May 25 | Sep 9 | Apr 23 | Sep 9 |
| 2000 | May 14 | Sep 23 | May 14 | Sep 24 |
| 1999 | May 12 | Sep 13 | May 12 | Sep 29 |
| 1998 | Jun 6 | Oct 6 | Apr 30 | Oct 7 |
| 1997 | May 19 | Oct 9 | May 12 | Oct 9 |
| 1996 | May 28 | Sep 26 | May 5 | Sep 26 |
| 1995 | Jun 11 | Sep 21 | May 4 | Sep 21 |
| 1994 | May 4 | Sep 22 | May 1 | Sep 22 |
| 1993 | May 11 | Sep 13 | May 10 | Sep 14 |
| 1992 | Apr 26 | Sep 18 | Apr 26 | Oct 8 |
| 1991 | May 6 | Sep 19 | May 5 | Sep 19 |
| 1990 | May 17 | Oct 3 | May 17 | Oct 8 |
| 1989 | Jun 22 | Sep 12 | May 6 | Oct 5 |
| 1988 | no data | Sep 20 | no data | Oct 21 |
"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.