Round Rock, TX Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Round Rock, a city in Williamson County, Texas.
This Afternoon
80°F
Sunny
Sunny. High near 80, with temperatures falling to around 74 in the afternoon. North northwest wind 5 to 10 mph.
7-day forecast for Round Rock
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 80°F | Sunny | 5 to 10 mph NNW | 0% |
| Tonight | 50°F | Mostly Clear | 5 mph NNW | 0% |
| Wednesday | 73°F | Sunny | 0 to 5 mph N | 0% |
| Wednesday Night | 50°F | Clear | 0 mph | 0% |
| Thursday | 79°F | Sunny | 0 to 5 mph SSW | 3% |
| Thursday Night | 53°F | Partly Cloudy | 5 to 10 mph WNW | 8% |
| Friday | 71°F | Sunny | 5 to 10 mph N | 0% |
| Friday Night | 49°F | Partly Cloudy | 5 mph N | 1% |
| Saturday | 68°F | Partly Sunny | 5 to 10 mph N | 14% |
| Saturday Night | 48°F | Partly Cloudy | 0 to 5 mph N | 10% |
| Sunday | 69°F | Mostly Sunny | 5 mph N | 5% |
| Sunday Night | 46°F | Mostly Clear | 0 to 5 mph NNW | 7% |
| Monday | 71°F | Sunny | 0 to 5 mph NE | 3% |
| Monday Night | 47°F | Mostly Clear | 0 to 5 mph S | 3% |
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 Nov 4, 2026.