Hall County climate

Hall County Frost Dates and Growing Season

NOAA 1991-2020 normals for Gainesville, 4.1 km from Hall County, elevation 1170 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Gainesville. 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 27 and the first fall freeze around November 12, a growing season of about 231 days.

Median at 36°F
last April 7, first November 1
Median at 32°F
last March 27, first November 12
Median at 28°F
last March 12, first November 26

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 23Apr 17Apr 13Apr 10Apr 7Apr 4Apr 1Mar 29Mar 22
32°FApr 11Apr 5Apr 2Mar 30Mar 27Mar 23Mar 18Mar 14Mar 6
28°FMar 31Mar 25Mar 20Mar 16Mar 12Mar 8Mar 3Feb 26Feb 19
24°FMar 19Mar 13Mar 6Mar 1Feb 24Feb 19Feb 12Feb 6Jan 28
20°FMar 6Feb 27Feb 18Feb 10Feb 5Jan 31Jan 25Jan 18Jan 8
16°FFeb 26Feb 11Feb 3Jan 30Jan 24Jan 19Jan 13Jan 8Jan 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°FOct 20Oct 24Oct 27Oct 30Nov 1Nov 4Nov 7Nov 10Nov 14
32°FOct 31Nov 2Nov 6Nov 8Nov 12Nov 15Nov 19Nov 25Dec 1
28°FNov 7Nov 13Nov 17Nov 22Nov 26Dec 1Dec 4Dec 9Dec 20
24°FNov 21Nov 27Dec 3Dec 7Dec 13Dec 20Dec 27Jan 1Jan 10
20°FDec 5Dec 14Dec 22Dec 27Jan 1Jan 4Jan 9Jan 16Jan 29
16°FDec 19Dec 29Jan 1Jan 5Jan 9Jan 13Jan 18Jan 25Feb 4

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°F228221216212207203198194187
32°F257249242235231227222216209
28°F291279272265260254248242233
24°F325314306299293287280271260
20°F359346338331325316308300289
16°F365365365358349341334327312

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
99% of years
20°F or colder
93% of years
16°F or colder
68% 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
3,262
Cooling degree days, base 65°F
1,418
Growing degree days, base 40°F
7,485
Growing degree days, base 45°F
5,926
Growing degree days, base 50°F
4,538
Growing degree days, base 55°F
3,324
Growing degree days, base 60°F
2,286

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January741022
February583032
March4273130
April20026290
May53115527
June3282729
July0397862
August0361826
September16196630
October16235346
November4282108
December650136

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 4.1 km from Hall 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 USC00093621 (Gainesville). Public domain.