Kearns climate

Kearns Frost Dates and Growing Season

NOAA 1991-2020 normals for Salt Lake City Intl AP, 13.3 km from Kearns, elevation 4225 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Salt Lake City Intl AP. A median date has an even chance of a later freeze in spring, or an earlier one in fall.

The last spring freeze typically comes around April 8 and the first fall freeze around October 31, a growing season of about 204 days.

Median at 36°F
last April 27, first October 19
Median at 32°F
last April 8, first October 31
Median at 28°F
last March 15, first November 10

Last freeze in spring

The chance of a later freeze than the date shown. At 10 percent, one spring in ten still freezes after the date; planting after the 10 percent date for 32°F is the cautious choice.

Threshold10%20%30%40%50%60%70%80%90%
36°FMay 14May 8May 3Apr 30Apr 27Apr 22Apr 18Apr 14Apr 8
32°FApr 30Apr 21Apr 16Apr 11Apr 8Apr 4Mar 31Mar 27Mar 17
28°FApr 8Mar 31Mar 27Mar 20Mar 15Mar 11Mar 7Mar 4Feb 27
24°FMar 19Mar 11Mar 7Mar 2Feb 28Feb 25Feb 20Feb 15Feb 8
20°FMar 4Feb 28Feb 24Feb 20Feb 16Feb 12Feb 7Feb 3Jan 27
16°FFeb 24Feb 18Feb 13Feb 9Feb 5Feb 1Jan 26Jan 16Jan 5

First freeze in fall

The chance of an earlier freeze than the date shown. At 10 percent, one fall in ten freezes before the date.

Threshold10%20%30%40%50%60%70%80%90%
36°FOct 7Oct 11Oct 15Oct 17Oct 19Oct 22Oct 25Oct 28Nov 2
32°FOct 17Oct 22Oct 25Oct 28Oct 31Nov 2Nov 5Nov 9Nov 13
28°FOct 27Nov 1Nov 4Nov 7Nov 10Nov 13Nov 17Nov 20Nov 24
24°FNov 5Nov 10Nov 14Nov 18Nov 21Nov 24Nov 27Dec 1Dec 6
20°FNov 13Nov 20Nov 23Nov 27Dec 1Dec 4Dec 8Dec 14Dec 20
16°FNov 22Nov 28Dec 1Dec 6Dec 11Dec 16Dec 21Dec 27Jan 4

Growing season length

Days between the last spring and first fall freeze at each threshold, with the chance of a season at least that long.

Threshold10%20%30%40%50%60%70%80%90%
36°F196188184178174170166159152
32°F229219213208204198193187177
28°F261253247243237233227221210
24°F288281275270266261256250240
20°F315306299293288283278272263
16°F340330323316311305298290283

How often it gets that cold

The share of years with at least one night at or below each temperature.

36°F or colder
100% of years
32°F or colder
100% of years
28°F or colder
100% of years
24°F or colder
100% of years
20°F or colder
100% of years
16°F or colder
98% of years

Degree days

A degree day is one degree of the daily mean temperature beyond a base, for one day. Heating degree days count cold (the fuel a house burns), cooling degree days heat, growing degree days the warmth a crop needs; each crop has its own base.

Heating degree days, base 65°F
5,154
Cooling degree days, base 65°F
1,420
Growing degree days, base 40°F
6,210
Growing degree days, base 45°F
4,935
Growing degree days, base 50°F
3,827
Growing degree days, base 55°F
2,879
Growing degree days, base 60°F
2,084

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,04101
February79404
March596043
April4005127
May17263366
June36234648
July1500964
August2441904
September59163555
October33714190
November698025
December1,01802

What this means

NOAA computes these from the daily lows at the station over 1991-2020, fitting the dates of each year's last and first freeze to a distribution, so a date can be stated at any level of risk. 36°F is a frost risk for tender plants on a clear, calm night, since the ground cools below the air above it; 32°F is a freeze; 28°F is a hard freeze that kills most annuals.

The station is 13.3 km from Kearns. Low ground, valleys and open fields freeze earlier and later than a town center or a hillside.

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Sources

NOAA NCEI U.S. Climate Normals, 1991-2020, annual and seasonal normals for station USW00024127 (Salt Lake City Intl AP). Public domain.