Last frost date in Alamo, TX

Average last frost
January 9

In Alamo, the last spring frost comes around January 9 in an average year. Wait until February 12 if you want 90% odds of no more frost. The first fall frost usually arrives about January 1, which leaves 365 frost-free days. An early freeze before December 8 happens one year in ten.

Safe after (10% risk)
Feb 12
Average first frost
Jan 1
Frost-free season
365 days
Hard freeze (28°F) ends
Jan 4
Next 7 nights in Alamo

No frost in the next 7 nights

National Weather Service forecast, updated Oct 22, 12:24 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 9First frost Jan 1365 frost-free daysBlue: chance of 32°F frost. Green: average frost-free season.JFMAMJJASOND365 frost-free days
Frost risk through the year at Mcallen, 8.3 miles from Alamo.

Planting calendar for Alamo

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 12–Dec 26
OnionsNov 28–Dec 19
CarrotsDec 19–Jan 23
LettuceDec 26–Jan 16
BroccoliDec 12–Dec 26
BeetsDec 12–Jan 23
PeasNov 28–Dec 12
CabbageDec 12–Dec 26
RadishesDec 5–Jan 16
Brussels sproutsDec 26–Jan 9
SpinachNov 28–Dec 19
CilantroDec 26–Jan 16
KaleDec 12–Dec 26
Collard greensDec 12–Dec 26
TurnipsDec 12–Dec 26
DillJan 9–Jan 23
CeleryJan 16–Jan 23
CauliflowerDec 26–Jan 9
LeeksDec 26–Jan 9
Swiss chardDec 26–Jan 23
ParsleyDec 26–Jan 16
Fall bulbs and garlic
JanFebMarAprMayJunJulAugSepOctNovDec
Tulip bulbsDec 15–Jan 15
GarlicOct 15–Nov 30
Daffodil bulbsOct 15–Nov 30
Perennials
JanFebMarAprMayJunJulAugSepOctNovDec
StrawberriesDec 12–Dec 26
AsparagusDec 12–Dec 26

Frost probabilities

ThresholdSpring, 90% chance laterSpring, 50%Spring, 10%Fall, 10% chance earlierFall, 50%Fall, 90%
Light frost, 32°FDec 14Jan 9Feb 12Dec 8Jan 1Feb 4
Hard freeze, 28°FDec 15Jan 4Feb 9Dec 14Jan 2Feb 6

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 Mcallen (USC00415701) sits 8.3 miles from the center of Alamo at 100 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 Alamo, TX?

The average last frost date in Alamo is January 9, based on NOAA 1991–2020 climate normals. There is a 10% chance of frost after February 12.

When is the first frost in Alamo?

The first frost in fall usually comes around January 1. One year in ten it arrives before December 8.

How long is the growing season in Alamo?

About 365 days between the average last and first frost.

When should I plant tomatoes in Alamo?

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

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