Sevierville climate

Sevierville Frost Dates and Growing Season

NOAA 1991-2020 normals for Sevierville, 7.6 km from Sevierville, elevation 899 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Sevierville. 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 29, a growing season of about 205 days.

Median at 36°F
last April 19, first October 21
Median at 32°F
last April 6, first October 29
Median at 28°F
last March 27, first November 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°FMay 5Apr 30Apr 25Apr 22Apr 19Apr 16Apr 13Apr 9Apr 4
32°FApr 21Apr 16Apr 11Apr 9Apr 6Apr 4Apr 1Mar 29Mar 23
28°FApr 9Apr 5Apr 2Mar 31Mar 27Mar 23Mar 19Mar 15Mar 8
24°FApr 1Mar 26Mar 22Mar 17Mar 14Mar 10Mar 5Feb 28Feb 20
20°FMar 22Mar 15Mar 8Mar 3Feb 28Feb 23Feb 15Feb 8Jan 31
16°FMar 12Mar 3Feb 25Feb 15Feb 8Feb 2Jan 29Jan 22Jan 12

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

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°F203197192188184180176171163
32°F223217212209205201197192185
28°F248240235230225221217212204
24°F281271264258252247241235226
20°F314302294288281275269262250
16°F348336329322314306299288277

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
98% 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
3,695
Cooling degree days, base 65°F
1,539
Growing degree days, base 40°F
7,342
Growing degree days, base 45°F
5,871
Growing degree days, base 50°F
4,551
Growing degree days, base 55°F
3,393
Growing degree days, base 60°F
2,393

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January831018
February644026
March4844110
April22227278
May58134542
June2305753
July0414879
August0389854
September19221652
October19243332
November500282
December744025

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 7.6 km from Sevierville. 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 USC00408179 (Sevierville). Public domain.