Last frost date in Round Rock, TX
Expect the last frost in Round Rock around March 11. Frost after March 29 happens in only one year out of ten. The first fall frost usually arrives about November 20, which leaves 254 frost-free days. An early freeze before November 3 happens one year in ten.
- Safe after (10% risk)
- Mar 29
- Average first frost
- Nov 20
- Frost-free season
- 254 days
- Hard freeze (28°F) ends
- Mar 1
No frost in the next 7 nights
National Weather Service forecast, updated Oct 22, 12:57 UTC
- ThuOct 2258°
- FriOct 2358°
- SatOct 2459°
- SunOct 2556°
- MonOct 2660°
- TueOct 2757°
- WedOct 2857°
Planting calendar for Round Rock
Windows count forward or back from the average frost dates above. Click a crop for dates across Texas.
TomatoesMar 18–Apr 1
PumpkinsMar 25–Apr 8
SunflowersMar 11–Apr 1
CucumbersMar 25–Apr 1
CornMar 18–Apr 1
Sweet potatoesApr 1–Apr 15
WatermelonMar 25–Apr 8
Green beansMar 18–Apr 8
ZucchiniMar 18–Apr 1
OkraApr 1–Apr 15
PeppersMar 25–Apr 8
BasilMar 18–Apr 1
Butternut squashMar 18–Apr 1
CantaloupeMar 25–Apr 8
EggplantMar 25–Apr 8
PotatoesFeb 11–Feb 25
OnionsJan 28–Feb 18
CarrotsFeb 18–Mar 25
LettuceFeb 25–Mar 18
BroccoliFeb 11–Feb 25
BeetsFeb 11–Mar 25
PeasJan 28–Feb 11
CabbageFeb 11–Feb 25
RadishesFeb 4–Mar 18
Brussels sproutsFeb 25–Mar 11
SpinachJan 28–Feb 18
CilantroFeb 25–Mar 18
KaleFeb 11–Feb 25
Collard greensFeb 11–Feb 25
TurnipsFeb 11–Feb 25
DillMar 11–Mar 25
CeleryMar 18–Mar 25
CauliflowerFeb 25–Mar 11
LeeksFeb 25–Mar 11
Swiss chardFeb 25–Mar 25
ParsleyFeb 25–Mar 18
Tulip bulbsNov 6–Dec 11
GarlicOct 15–Nov 30
Daffodil bulbsOct 15–Nov 30
StrawberriesFeb 11–Feb 25
AsparagusFeb 11–Feb 25Frost probabilities
| Threshold | Spring, 90% chance later | Spring, 50% | Spring, 10% | Fall, 10% chance earlier | Fall, 50% | Fall, 90% |
|---|---|---|---|---|---|---|
| Light frost, 32°F | Feb 22 | Mar 11 | Mar 29 | Nov 3 | Nov 20 | Dec 9 |
| Hard freeze, 28°F | Jan 31 | Mar 1 | Mar 19 | Nov 12 | Dec 3 | Dec 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 Austin Great Hills (USC00410433) sits 9.9 miles from the center of Round Rock at 880 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 Round Rock, TX?
The average last frost date in Round Rock is March 11, based on NOAA 1991–2020 climate normals. There is a 10% chance of frost after March 29.
When is the first frost in Round Rock?
The first frost in fall usually comes around November 20. One year in ten it arrives before November 3.
How long is the growing season in Round Rock?
About 254 days between the average last and first frost.
When should I plant tomatoes in Round Rock?
Plant tomato seedlings outside from March 18 to April 1. Start seeds indoors six to eight weeks earlier.
Nearby in Texas
- Brushy CreekMar 11
- PflugervilleMar 11
- HuttoMar 8
- Cedar ParkMar 11
- GeorgetownMar 6
- LeanderMar 6
- ManorMar 4
- AustinFeb 20
- Harker HeightsMar 14
- BeltonMar 14
- KilleenMar 14
- KyleFeb 28