Marshall County climate

Marshall County Frost Dates and Growing Season

NOAA 1991-2020 normals for Holly Springs 4 N, 9.1 km from Marshall County, elevation 483 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Holly Springs 4 N. 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 6 and the first fall freeze around October 26, a growing season of about 204 days.

Median at 36°F
last April 18, first October 17
Median at 32°F
last April 6, first October 26
Median at 28°F
last March 26, first November 5

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 4Apr 29Apr 25Apr 21Apr 18Apr 15Apr 11Apr 8Apr 2
32°FApr 23Apr 17Apr 12Apr 9Apr 6Apr 4Mar 31Mar 26Mar 19
28°FApr 12Apr 7Apr 4Mar 31Mar 26Mar 20Mar 16Mar 11Mar 4
24°FApr 2Mar 24Mar 18Mar 14Mar 10Mar 6Mar 1Feb 25Feb 18
20°FMar 16Mar 10Mar 4Feb 28Feb 24Feb 19Feb 12Feb 4Jan 27
16°FMar 5Feb 27Feb 20Feb 13Feb 6Feb 1Jan 27Jan 20Jan 11

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

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°F204196191186182178173169161
32°F227218213208204200195190182
28°F256245239232227221215209202
24°F285272267259253247241234226
20°F319307299291284277270261252
16°F353340333324317309303295283

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
97% 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
3,406
Cooling degree days, base 65°F
1,709
Growing degree days, base 40°F
7,772
Growing degree days, base 45°F
6,261
Growing degree days, base 50°F
4,896
Growing degree days, base 55°F
3,677
Growing degree days, base 60°F
2,613

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January789031
February607147
March42111160
April19347326
May50162577
June2336784
July0448913
August1413877
September20227657
October18456355
November4427127
December697142

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 9.1 km from Marshall County. Low ground, valleys and open fields freeze earlier and later than a town center or a hillside.

More

Sources

NOAA NCEI U.S. Climate Normals, 1991-2020, annual and seasonal normals for station USC00224173 (Holly Springs 4 N). Public domain.