Frost history / Salt Lake Triad Ctr, UT
Salt Lake Triad Ctr, UT: frost dates by year
Last spring and first fall frost at NOAA station USC00427606, 1987 to 2019, measured from daily minimum temperatures.
Elevation 4,280 ft, 40.771, -111.896. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Apr 11 | Nov 5 |
| Earliest | Feb 16 (1992) | Oct 10 (2019) |
| Latest | May 1 (1988) | Nov 21 (1999) |
| Trend | 4.5 days later per decade | 5.6 days earlier per decade |
| Years with data | 11 | 13 |
At 28°F (hard freeze) the median last spring date is Mar 12 and the median first fall date is Nov 16.
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 |
|---|---|---|---|---|
| 2019 | no data | Oct 10 | no data | Oct 28 |
| 2012 | Apr 6 | no data | Mar 8 | no data |
| 2011 | Apr 30 | Nov 5 | Feb 27 | Dec 2 |
| 2000 | Mar 30 | no data | Mar 20 | no data |
| 1999 | Apr 11 | Nov 21 | Apr 10 | Nov 23 |
| 1998 | Apr 15 | Nov 6 | Mar 9 | Dec 5 |
| 1997 | no data | Nov 14 | no data | Nov 16 |
| 1994 | no data | Oct 30 | no data | Nov 13 |
| 1993 | Mar 12 | Nov 5 | Mar 12 | Nov 14 |
| 1992 | Feb 16 | Nov 3 | Feb 3 | Nov 10 |
| 1991 | no data | Oct 27 | no data | Oct 29 |
| 1990 | Apr 29 | Nov 3 | Mar 14 | Nov 7 |
| 1989 | Mar 14 | Oct 30 | Mar 5 | Nov 27 |
| 1988 | May 1 | Nov 15 | Mar 28 | Nov 19 |
| 1987 | Apr 19 | Nov 15 | Mar 30 | Nov 18 |
"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.