Hinckley climate

Hinckley Frost Dates and Growing Season

NOAA 1991-2020 normals for Deseret, 4.5 km from Hinckley, elevation 4590 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Deseret. 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 May 14 and the first fall freeze around September 30, a growing season of about 137 days.

Median at 36°F
last May 28, first September 21
Median at 32°F
last May 14, first September 30
Median at 28°F
last May 1, first October 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°FJun 16Jun 9Jun 4May 31May 28May 25May 21May 17May 12
32°FMay 31May 25May 20May 17May 14May 10May 7May 3Apr 29
28°FMay 16May 11May 7May 3May 1Apr 28Apr 25Apr 21Apr 16
24°FMay 4Apr 30Apr 26Apr 21Apr 18Apr 14Apr 10Apr 6Apr 1
20°FApr 19Apr 13Apr 7Apr 3Mar 31Mar 27Mar 22Mar 15Mar 7
16°FApr 2Mar 26Mar 19Mar 12Mar 8Mar 4Feb 28Feb 24Feb 16

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°FSep 5Sep 11Sep 15Sep 18Sep 21Sep 23Sep 26Sep 28Oct 2
32°FSep 16Sep 22Sep 25Sep 28Sep 30Oct 2Oct 5Oct 9Oct 14
28°FSep 29Oct 1Oct 5Oct 7Oct 10Oct 13Oct 17Oct 20Oct 24
24°FOct 7Oct 13Oct 16Oct 19Oct 21Oct 24Oct 28Nov 1Nov 4
20°FOct 16Oct 21Oct 25Oct 29Nov 1Nov 3Nov 6Nov 10Nov 15
16°FOct 26Nov 1Nov 4Nov 8Nov 11Nov 15Nov 18Nov 22Nov 27

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°F1341271221181141091049991
32°F157150146141137133128122115
28°F181174169164160156151147139
24°F207199194189185180176169161
20°F237229223217211207202196187
16°F270262256250244238231224213

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
100% 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
5,971
Cooling degree days, base 65°F
905
Growing degree days, base 40°F
5,270
Growing degree days, base 45°F
4,085
Growing degree days, base 50°F
3,071
Growing degree days, base 55°F
2,210
Growing degree days, base 60°F
1,492

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,15900
February87101
March668022
April460185
May22025284
June48156558
July2349812
August3300763
September9873429
October4502109
November82708
December1,16500

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 4.5 km from Hinckley. 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 USC00422101 (Deseret). Public domain.