Liberty climate

Liberty Frost Dates and Growing Season

NOAA 1991-2020 normals for Eden-Liberty, 1.6 km from Liberty, elevation 5195 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Eden-Liberty. 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 25 and the first fall freeze around September 26, a growing season of about 123 days.

Median at 36°F
last June 10, first September 15
Median at 32°F
last May 25, first September 26
Median at 28°F
last May 4, first October 7

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 26Jun 21Jun 17Jun 14Jun 10Jun 7Jun 4May 31May 23
32°FJun 16Jun 8Jun 4May 31May 25May 20May 16May 11May 4
28°FMay 30May 19May 13May 8May 4May 1Apr 27Apr 22Apr 17
24°FMay 4Apr 28Apr 24Apr 19Apr 15Apr 11Apr 8Apr 4Mar 30
20°FApr 16Apr 9Apr 5Apr 2Mar 30Mar 26Mar 21Mar 16Mar 10
16°FApr 3Mar 28Mar 22Mar 17Mar 14Mar 10Mar 7Mar 3Feb 26

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 1Sep 5Sep 9Sep 13Sep 15Sep 17Sep 20Sep 23Sep 28
32°FSep 12Sep 17Sep 21Sep 24Sep 26Sep 29Oct 1Oct 5Oct 12
28°FSep 23Sep 28Oct 1Oct 4Oct 7Oct 10Oct 14Oct 18Oct 23
24°FOct 4Oct 8Oct 13Oct 16Oct 20Oct 23Oct 27Oct 31Nov 5
20°FOct 17Oct 23Oct 27Oct 31Nov 2Nov 6Nov 9Nov 13Nov 18
16°FOct 26Nov 2Nov 6Nov 9Nov 14Nov 17Nov 20Nov 24Nov 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°F119110105999591868172
32°F14814013412912311811210698
28°F180172167161156151146138127
24°F209202197192188182176171162
20°F240231225220216212206200194
16°F265258252247242237231224216

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
7,193
Cooling degree days, base 65°F
319
Growing degree days, base 40°F
3,930
Growing degree days, base 45°F
2,898
Growing degree days, base 50°F
2,026
Growing degree days, base 55°F
1,306
Growing degree days, base 60°F
734

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,26800
February1,05000
March85705
April619026
May3873129
June14128342
July11152606
August17123572
September19413279
October541063
November87605
December1,23200

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 1.6 km from Liberty. 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 USC00422389 (Eden-Liberty). Public domain.