Shreveport climate

Shreveport Frost Dates and Growing Season

NOAA 1991-2020 normals for Shreveport Dwtn AP, 2 km from Shreveport, elevation 179 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Shreveport Dwtn AP. 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 February 28 and the first fall freeze around November 24, a growing season of about 268 days.

Median at 36°F
last March 14, first November 12
Median at 32°F
last February 28, first November 24
Median at 28°F
last February 11, first December 10

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 3Mar 29Mar 23Mar 19Mar 14Mar 10Mar 5Mar 1Feb 24
32°FMar 19Mar 12Mar 7Mar 4Feb 28Feb 24Feb 20Feb 14Feb 4
28°FMar 7Feb 28Feb 23Feb 17Feb 11Feb 6Feb 1Jan 26Jan 16
24°FFeb 24Feb 15Feb 7Feb 1Jan 28Jan 22Jan 16Jan 9Dec 29
20°FFeb 14Feb 5Jan 30Jan 24Jan 17Jan 13Jan 6Dec 31Dec 22
16°F–––––––––

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 31Nov 3Nov 6Nov 9Nov 12Nov 15Nov 19Nov 23Nov 29
32°FNov 7Nov 12Nov 16Nov 20Nov 24Nov 28Dec 1Dec 6Dec 14
28°FNov 17Nov 25Nov 30Dec 5Dec 10Dec 17Dec 23Dec 31Jan 7
24°FDec 3Dec 15Dec 22Dec 29Jan 2Jan 6Jan 11Jan 18Feb 1
20°FDec 15Dec 25Dec 31Jan 4Jan 9Jan 14Jan 21Jan 29Feb 7
16°F–––––––––

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°F267259252247243238233226217
32°F298286279273268263258250241
28°F337328319311304297288280269
24°F365363353345339333327317305
20°F365365365365365365360348334
16°F365365365365365365365365365

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
99% of years
24°F or colder
81% of years
20°F or colder
38% of years
16°F or colder
8% 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
1,947
Cooling degree days, base 65°F
2,894
Growing degree days, base 40°F
10,128
Growing degree days, base 45°F
8,410
Growing degree days, base 50°F
6,810
Growing degree days, base 55°F
5,350
Growing degree days, base 60°F
4,039

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January5116103
February36812143
March21243317
April65121507
May5326786
June0516966
July06291,094
August06211,086
September2420868
October62158562
November25631256
December46610122

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 2 km from Shreveport. 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 USW00053905 (Shreveport Dwtn AP). Public domain.