Last frost date in Alton, TX

Average last frost
January 23

The average last frost in Alton is January 23. By February 27 the chance of another 32°F night drops to 1 in 10. The first fall frost usually arrives about December 28, which leaves 340 frost-free days. An early freeze before December 2 happens one year in ten.

Safe after (10% risk)
Feb 27
Average first frost
Dec 28
Frost-free season
340 days
Hard freeze (28°F) ends
Jan 7
Next 7 nights in Alton

No frost in the next 7 nights

National Weather Service forecast, updated Oct 22, 12:57 UTC

  1. ThuOct 2265°
  2. FriOct 2367°
  3. SatOct 2469°
  4. SunOct 2567°
  5. MonOct 2667°
  6. TueOct 2767°
  7. WedOct 2865°
JanFebMarAprMayJunJulAugSepOctNovDecLast frost Jan 23First frost Dec 28340 frost-free daysBlue: chance of 32°F frost. Green: average frost-free season.JFMAMJJASOND340 frost-free days
Frost risk through the year at La Joya, 2.5 miles from Alton.

Planting calendar for Alton

Windows count forward or back from the average frost dates above. Click a crop for dates across Texas.

Start indoorsPlant outSow outdoorsFall plantingAverage last and first frost
Warm-season crops
JanFebMarAprMayJunJulAugSepOctNovDec
TomatoesFeb 15–Mar 1
PumpkinsFeb 15–Mar 1
SunflowersFeb 15–Mar 8
CucumbersFeb 22–Mar 1
CornFeb 15–Mar 1
Sweet potatoesFeb 15–Mar 1
WatermelonFeb 15–Mar 1
Green beansFeb 15–Mar 8
ZucchiniFeb 15–Mar 1
OkraFeb 15–Mar 1
PeppersFeb 15–Mar 1
BasilFeb 15–Mar 1
Butternut squashFeb 15–Mar 1
CantaloupeFeb 15–Mar 1
EggplantFeb 15–Mar 1
Cool-season crops
JanFebMarAprMayJunJulAugSepOctNovDec
PotatoesDec 26–Jan 9
OnionsDec 12–Jan 2
CarrotsJan 2–Feb 6
LettuceJan 9–Jan 30
BroccoliDec 26–Jan 9
BeetsDec 26–Feb 6
PeasDec 12–Dec 26
CabbageDec 26–Jan 9
RadishesDec 19–Jan 30
Brussels sproutsJan 9–Jan 23
SpinachDec 12–Jan 2
CilantroJan 9–Jan 30
KaleDec 26–Jan 9
Collard greensDec 26–Jan 9
TurnipsDec 26–Jan 9
DillJan 23–Feb 6
CeleryJan 30–Feb 6
CauliflowerJan 9–Jan 23
LeeksJan 9–Jan 23
Swiss chardJan 9–Feb 6
ParsleyJan 9–Jan 30
Fall bulbs and garlic
JanFebMarAprMayJunJulAugSepOctNovDec
Tulip bulbsDec 15–Jan 15
GarlicOct 15–Nov 30
Daffodil bulbsOct 15–Nov 30
Perennials
JanFebMarAprMayJunJulAugSepOctNovDec
StrawberriesDec 26–Jan 9
AsparagusDec 26–Jan 9

Frost probabilities

ThresholdSpring, 90% chance laterSpring, 50%Spring, 10%Fall, 10% chance earlierFall, 50%Fall, 90%
Light frost, 32°FDec 22Jan 23Feb 27Dec 2Dec 28Feb 1
Hard freeze, 28°FDec 17Jan 7Feb 6Dec 13Jan 1Feb 1

Read the spring 10% column as the date after which only one year in ten still gets frost. That is the safer date for tomatoes, peppers and basil.

Where these numbers come from

NOAA station La Joya (USC00414911) sits 2.5 miles from the center of Alton at 213 feet. Its averages cover 1991 to 2020. Low spots, valleys and open fields can keep getting frost a week or two after the station stops; city centers and lakeshores usually get less of it.

Questions

When is the last frost in Alton, TX?

The average last frost date in Alton is January 23, based on NOAA 1991–2020 climate normals. There is a 10% chance of frost after February 27.

When is the first frost in Alton?

The first frost in fall usually comes around December 28. One year in ten it arrives before December 2.

How long is the growing season in Alton?

About 340 days between the average last and first frost.

When should I plant tomatoes in Alton?

Plant tomato seedlings outside from February 15 to March 1. Start seeds indoors six to eight weeks earlier.

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