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
96°F
Mostly Sunny
Mostly sunny, with a high near 96. East southeast wind around 5 mph.
7-day forecast for Round Rock
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 96°F | Mostly Sunny | 5 mph ESE | 0% |
| Tonight | 73°F | Mostly Clear | 0 to 5 mph SSE | 0% |
| Saturday | 98°F | Sunny | 0 to 5 mph S | 0% |
| Saturday Night | 74°F | Mostly Clear | 5 to 10 mph SSE | 0% |
| Sunday | 98°F | Mostly Sunny | 5 mph S | 0% |
| Sunday Night | 75°F | Partly Cloudy | 5 to 10 mph SSE | 14% |
| Monday | 98°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 5 mph SSE | 15% |
| Monday Night | 75°F | Slight Chance Showers And Thunderstorms then Mostly Clear | 0 to 5 mph SSE | 15% |
| Tuesday | 98°F | Sunny | 0 to 5 mph NNE | 12% |
| Tuesday Night | 75°F | Partly Cloudy | 0 to 5 mph ENE | 12% |
| Wednesday | 98°F | Mostly Sunny | 0 to 10 mph NE | 5% |
| Wednesday Night | 75°F | Partly Cloudy | 0 to 10 mph E | 4% |
| Thursday | 97°F | Mostly Sunny | 0 to 10 mph ENE | 5% |
| Thursday Night | 73°F | Partly Cloudy | 0 to 10 mph E | 5% |
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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Hutto
Jarrell
Liberty Hill
Santa Rita Ranch
Serenada
Sonterra
Taylor
Thrall
Weir
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 Sep 19, 2026.