Frost history / Brian Head, UT
Brian Head, UT: frost dates by year
Last spring and first fall frost at NOAA station USC00420900, 1992 to 2006, measured from daily minimum temperatures.
Elevation 9,770 ft, 37.693, -112.847. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Jun 17 | Sep 7 |
| Earliest | Jun 4 (2002) | Aug 5 (2006) |
| Latest | Jul 6 (2004) | Sep 21 (1997) |
| Trend | 10.8 days earlier per decade | 26.9 days earlier per decade |
| Years with data | 10 | 12 |
At 28°F (hard freeze) the median last spring date is Jun 14 and the median first fall date is Sep 15.
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 |
|---|---|---|---|---|
| 2006 | Jun 16 | Aug 5 | Jun 16 | Sep 16 |
| 2005 | Jun 14 | Aug 20 | Jun 10 | Sep 10 |
| 2004 | Jul 6 | Sep 3 | Jun 11 | Sep 4 |
| 2003 | no data | Sep 11 | no data | Sep 13 |
| 2002 | Jun 4 | Sep 9 | Jun 1 | Sep 19 |
| 2001 | Jun 17 | Sep 6 | Jun 16 | Sep 6 |
| 2000 | Jun 17 | Sep 8 | Jun 11 | Sep 23 |
| 1999 | Jun 13 | Sep 4 | Jun 12 | Sep 5 |
| 1998 | Jun 23 | Sep 13 | Jun 17 | Oct 1 |
| 1997 | Jul 6 | Sep 21 | Jul 1 | Sep 21 |
| 1996 | no data | Sep 7 | no data | Sep 14 |
| 1995 | no data | Sep 18 | no data | Sep 20 |
| 1992 | Jul 2 | no data | Jul 2 | 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.