Round Rock, TX Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Round Rock, a city in Williamson County, Texas.
Today
99°F
Sunny
Sunny, with a high near 99. Heat index values as high as 104. South wind 5 to 10 mph.
7-day forecast for Round Rock
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 99°F | Sunny | 5 to 10 mph S | 2% |
| Tonight | 76°F | Mostly Clear | 5 to 10 mph S | 2% |
| Wednesday | 99°F | Sunny | 5 to 10 mph S | 1% |
| Wednesday Night | 77°F | Mostly Clear | 5 to 10 mph S | 1% |
| Thursday | 99°F | Sunny | 5 mph S | 4% |
| Thursday Night | 77°F | Partly Cloudy | 5 to 10 mph SSE | 4% |
| Friday | 97°F | Sunny | 5 mph S | 5% |
| Friday Night | 76°F | Mostly Clear | 5 to 10 mph SSE | 5% |
| Saturday | 96°F | Sunny | 5 mph SSE | 4% |
| Saturday Night | 76°F | Mostly Clear | 5 mph SSE | 4% |
| Sunday | 96°F | Sunny | 5 mph S | 5% |
| Sunday Night | 76°F | Mostly Clear | 5 to 10 mph SSE | 5% |
| Monday | 97°F | Mostly Sunny | 5 to 10 mph S | 4% |
| Monday Night | 76°F | Mostly Clear | 10 mph S | 4% |
Forecast source: National Weather Service (api.weather.gov) for Round Rock (30.527, -97.660). Updated through the day.
Growing snapshot for Round Rock
Last spring frost
Mar 11
First fall frost
Nov 20
Growing season
254 days
Hardiness zone
9a
More local growing data for Round Rock: nearby ZIP 78664 weather · frost dates · planting calendar · Texas frost dates
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Climate data from the nearest NOAA station, Austin Great Hills, Tx (9.5 mi from Round Rock). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.