Logan County climate

Logan County Frost Dates and Growing Season

NOAA 1991-2020 normals for Russell Springs 3N, 5.2 km from Logan County, elevation 3064 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Russell Springs 3N. 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 30 and the first fall freeze around October 14, a growing season of about 164 days.

Median at 36°F
last May 9, first October 4
Median at 32°F
last April 30, first October 14
Median at 28°F
last April 20, first October 22

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 23May 18May 15May 11May 9May 6May 4May 1Apr 28
32°FMay 15May 9May 5May 2Apr 30Apr 28Apr 25Apr 21Apr 16
28°FMay 3Apr 30Apr 26Apr 23Apr 20Apr 17Apr 14Apr 10Apr 5
24°FApr 24Apr 18Apr 15Apr 11Apr 8Apr 5Apr 2Mar 31Mar 24
20°FApr 14Apr 8Apr 4Apr 2Mar 31Mar 27Mar 23Mar 18Mar 12
16°FApr 5Mar 31Mar 26Mar 22Mar 18Mar 14Mar 11Mar 7Mar 1

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 22Sep 26Sep 29Oct 1Oct 4Oct 6Oct 8Oct 11Oct 15
32°FOct 1Oct 5Oct 8Oct 11Oct 14Oct 16Oct 18Oct 21Oct 24
28°FOct 7Oct 13Oct 17Oct 19Oct 22Oct 24Oct 26Oct 29Nov 2
24°FOct 16Oct 21Oct 24Oct 27Oct 29Nov 1Nov 4Nov 8Nov 11
20°FOct 22Oct 28Nov 1Nov 4Nov 7Nov 9Nov 12Nov 16Nov 21
16°FOct 28Nov 4Nov 8Nov 11Nov 15Nov 18Nov 21Nov 25Dec 1

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°F164158153151147143139135130
32°F184178172168164161158153147
28°F202196192188184180176170164
24°F223215211206202199194189182
20°F243235230224220215210205197
16°F262256250244239235229223214

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
5,673
Cooling degree days, base 65°F
1,187
Growing degree days, base 40°F
5,827
Growing degree days, base 45°F
4,619
Growing degree days, base 50°F
3,560
Growing degree days, base 55°F
2,638
Growing degree days, base 60°F
1,848

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,09301
February91306
March729137
April4424122
May19057349
June25241666
July2405868
August4328789
September80139513
October37814186
November752024
December1,06601

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 5.2 km from Logan 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 USC00147050 (Russell Springs 3N). Public domain.