Nacogdoches County climate

Nacogdoches County Frost Dates and Growing Season

NOAA 1991-2020 normals for Nacogdoches, 2.6 km from Nacogdoches County, elevation 435 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Nacogdoches. 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 13 and the first fall freeze around November 17, a growing season of about 248 days.

Median at 36°F
last March 30, first November 6
Median at 32°F
last March 13, first November 17
Median at 28°F
last February 28, first December 1

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 17Apr 11Apr 6Apr 3Mar 30Mar 25Mar 20Mar 13Mar 7
32°FApr 6Mar 31Mar 23Mar 18Mar 13Mar 9Mar 5Feb 28Feb 21
28°FMar 20Mar 13Mar 8Mar 3Feb 28Feb 24Feb 18Feb 8Jan 30
24°FMar 10Mar 1Feb 22Feb 14Feb 6Jan 31Jan 26Jan 17Jan 2
20°FMar 1Feb 15Feb 5Jan 31Jan 25Jan 18Jan 11Jan 1Dec 23
16°FFeb 21Feb 6Feb 1Jan 28Jan 23Jan 16Jan 9Jan 5Jan 2

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 26Oct 31Nov 2Nov 4Nov 6Nov 9Nov 13Nov 17Nov 23
32°FNov 1Nov 5Nov 10Nov 13Nov 17Nov 21Nov 25Dec 1Dec 5
28°FNov 9Nov 16Nov 21Nov 26Dec 1Dec 3Dec 7Dec 14Dec 25
24°FNov 22Nov 30Dec 5Dec 10Dec 17Dec 26Jan 1Jan 8Jan 21
20°FDec 7Dec 17Dec 25Dec 31Jan 3Jan 9Jan 15Jan 25Feb 9
16°FJan 1Jan 3Jan 4Jan 8Jan 12Jan 17Jan 26Feb 1Feb 12

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°F250240233228223217213207198
32°F278267260254248242235228218
28°F315301292283276270263256245
24°F355341333324314306298288274
20°F365365365365358348338326310
16°F365365365365365365365365353

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
95% of years
20°F or colder
60% of years
16°F or colder
16% 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
2,214
Cooling degree days, base 65°F
2,521
Growing degree days, base 40°F
9,514
Growing degree days, base 45°F
7,830
Growing degree days, base 50°F
6,273
Growing degree days, base 55°F
4,859
Growing degree days, base 60°F
3,606

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January561479
February4019122
March25830273
April9489448
May15266716
June0456906
July05631,028
August05641,029
September3374820
October76135526
November28826233
December518694

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 2.6 km from Nacogdoches 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 USC00416177 (Nacogdoches). Public domain.