Last frost date in Sienna, TX

Average last frost
February 15

The average last frost in Sienna is February 15. By March 15 the chance of another 32°F night drops to 1 in 10. The first fall frost usually arrives about December 6, which leaves 297 frost-free days. An early freeze before November 13 happens one year in ten.

Safe after (10% risk)
Mar 15
Average first frost
Dec 6
Frost-free season
297 days
Hard freeze (28°F) ends
Jan 26
Next 7 nights in Sienna

No frost in the next 7 nights

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

  1. ThuOct 2256°
  2. FriOct 2359°
  3. SatOct 2461°
  4. SunOct 2562°
  5. MonOct 2662°
  6. TueOct 2761°
  7. WedOct 2859°
JanFebMarAprMayJunJulAugSepOctNovDecLast frost Feb 15First frost Dec 6297 frost-free daysBlue: chance of 32°F frost. Green: average frost-free season.JFMAMJJASOND297 frost-free days
Frost risk through the year at Thompsons 3 WSW, 7.5 miles from Sienna.

Planting calendar for Sienna

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 22–Mar 8
PumpkinsMar 1–Mar 15
SunflowersFeb 15–Mar 8
CucumbersMar 1–Mar 8
CornFeb 22–Mar 8
Sweet potatoesMar 8–Mar 22
WatermelonMar 1–Mar 15
Green beansFeb 22–Mar 15
ZucchiniFeb 22–Mar 8
OkraMar 8–Mar 22
PeppersMar 1–Mar 15
BasilFeb 22–Mar 8
Butternut squashFeb 22–Mar 8
CantaloupeMar 1–Mar 15
EggplantMar 1–Mar 15
Cool-season crops
JanFebMarAprMayJunJulAugSepOctNovDec
PotatoesJan 18–Feb 1
OnionsJan 4–Jan 25
CarrotsJan 25–Mar 1
LettuceFeb 1–Feb 22
BroccoliJan 18–Feb 1
BeetsJan 18–Mar 1
PeasJan 4–Jan 18
CabbageJan 18–Feb 1
RadishesJan 11–Feb 22
Brussels sproutsFeb 1–Feb 15
SpinachJan 4–Jan 25
CilantroFeb 1–Feb 22
KaleJan 18–Feb 1
Collard greensJan 18–Feb 1
TurnipsJan 18–Feb 1
DillFeb 15–Mar 1
CeleryFeb 22–Mar 1
CauliflowerFeb 1–Feb 15
LeeksFeb 1–Feb 15
Swiss chardFeb 1–Mar 1
ParsleyFeb 1–Feb 22
Fall bulbs and garlic
JanFebMarAprMayJunJulAugSepOctNovDec
Tulip bulbsDec 15–Jan 15
GarlicOct 15–Nov 30
Daffodil bulbsOct 15–Nov 30
Perennials
JanFebMarAprMayJunJulAugSepOctNovDec
StrawberriesJan 18–Feb 1
AsparagusJan 18–Feb 1

Frost probabilities

ThresholdSpring, 90% chance laterSpring, 50%Spring, 10%Fall, 10% chance earlierFall, 50%Fall, 90%
Light frost, 32°FJan 13Feb 15Mar 15Nov 13Dec 6Jan 5
Hard freeze, 28°FDec 21Jan 26Mar 5Nov 29Dec 29Jan 29

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 Thompsons 3 WSW (USC00418996) sits 7.5 miles from the center of Sienna at 70 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 Sienna, TX?

The average last frost date in Sienna is February 15, based on NOAA 1991–2020 climate normals. There is a 10% chance of frost after March 15.

When is the first frost in Sienna?

The first frost in fall usually comes around December 6. One year in ten it arrives before November 13.

How long is the growing season in Sienna?

About 297 days between the average last and first frost.

When should I plant tomatoes in Sienna?

Plant tomato seedlings outside from February 22 to March 8. Start seeds indoors six to eight weeks earlier.

Nearby in Texas

All 171 cities in Texas