Trigg County climate

Trigg County Frost Dates and Growing Season

NOAA 1991-2020 normals for Kenlake Resort, 24.2 km from Trigg County, elevation 484 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Kenlake Resort. 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 March 30 and the first fall freeze around November 4, a growing season of about 221 days.

Median at 36°F
last April 11, first October 26
Median at 32°F
last March 30, first November 4
Median at 28°F
last March 16, first November 16

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°FApr 28Apr 22Apr 18Apr 14Apr 11Apr 8Apr 4Mar 31Mar 26
32°FApr 16Apr 9Apr 6Apr 2Mar 30Mar 26Mar 22Mar 17Mar 12
28°FApr 6Mar 30Mar 24Mar 20Mar 16Mar 12Mar 8Mar 4Feb 26
24°FMar 23Mar 16Mar 11Mar 7Mar 4Feb 28Feb 25Feb 19Feb 12
20°FMar 11Mar 4Feb 28Feb 25Feb 21Feb 16Feb 12Feb 6Feb 1
16°FMar 2Feb 24Feb 18Feb 13Feb 8Feb 3Jan 31Jan 26Jan 15

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 15Oct 18Oct 22Oct 24Oct 26Oct 28Oct 31Nov 3Nov 7
32°FOct 23Oct 28Oct 31Nov 2Nov 4Nov 8Nov 11Nov 14Nov 21
28°FNov 1Nov 5Nov 10Nov 13Nov 16Nov 20Nov 23Nov 28Dec 4
24°FNov 11Nov 16Nov 20Nov 25Nov 29Dec 1Dec 5Dec 10Dec 19
20°FNov 20Nov 29Dec 2Dec 6Dec 11Dec 17Dec 22Dec 27Jan 2
16°FDec 1Dec 8Dec 16Dec 21Dec 27Dec 31Jan 5Jan 12Jan 21

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°F219211206201197193189183176
32°F246237231226221216211206198
28°F272262255250246240234229220
24°F299288281276270265259252244
20°F322313306300295289283275266
16°F342334328323318312306299288

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
3,841
Cooling degree days, base 65°F
1,742
Growing degree days, base 40°F
7,547
Growing degree days, base 45°F
6,099
Growing degree days, base 50°F
4,786
Growing degree days, base 55°F
3,620
Growing degree days, base 60°F
2,611

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January897016
February692136
March49112128
April21443303
May62150554
June2342790
July0456921
August0439903
September21240669
October19656339
November4834102
December784026

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 24.2 km from Trigg County. 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 USC00154375 (Kenlake Resort). Public domain.