Landmark climate

Landmark Frost Dates and Growing Season

NOAA 1991-2020 normals for Little Rock AP Adams Fld, 14.9 km from Landmark, elevation 258 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Little Rock AP Adams Fld. 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 21 and the first fall freeze around November 10, a growing season of about 234 days.

Median at 36°F
last April 3, first October 31
Median at 32°F
last March 21, first November 10
Median at 28°F
last March 8, first November 21

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 21Apr 13Apr 9Apr 6Apr 3Mar 31Mar 27Mar 23Mar 16
32°FApr 6Apr 1Mar 28Mar 25Mar 21Mar 16Mar 13Mar 8Mar 2
28°FMar 26Mar 19Mar 15Mar 12Mar 8Mar 4Mar 1Feb 26Feb 20
24°FMar 15Mar 10Mar 5Mar 1Feb 26Feb 22Feb 18Feb 12Feb 1
20°FMar 7Feb 28Feb 21Feb 15Feb 10Feb 4Jan 30Jan 24Jan 14
16°FFeb 22Feb 10Feb 4Jan 31Jan 27Jan 21Jan 14Jan 6Dec 30

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 20Oct 23Oct 26Oct 29Oct 31Nov 2Nov 5Nov 8Nov 14
32°FOct 29Nov 1Nov 4Nov 7Nov 10Nov 13Nov 17Nov 20Nov 25
28°FNov 6Nov 10Nov 15Nov 18Nov 21Nov 24Nov 28Dec 2Dec 8
24°FNov 15Nov 21Nov 26Nov 30Dec 3Dec 7Dec 12Dec 19Dec 27
20°FNov 29Dec 5Dec 11Dec 17Dec 22Dec 28Jan 1Jan 6Jan 16
16°FDec 10Dec 19Dec 27Jan 1Jan 3Jan 8Jan 15Jan 21Feb 2

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°F234226220216211206202197190
32°F257249244240234230225219210
28°F281273267261256252247241233
24°F310301294288283278271264255
20°F344335328321315307301294283
16°F365365357349342335329320308

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
98% of years
16°F or colder
81% 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
3,165
Cooling degree days, base 65°F
1,989
Growing degree days, base 40°F
8,209
Growing degree days, base 45°F
6,660
Growing degree days, base 50°F
5,263
Growing degree days, base 55°F
4,019
Growing degree days, base 60°F
2,925

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January754129
February569151
March39111164
April15448352
May30182617
June0389838
July0510975
August0490955
September11281720
October14569397
November4257125
December684141

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 14.9 km from Landmark. 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 USW00013963 (Little Rock AP Adams Fld). Public domain.