Round Rock hail storm history
Williamson County·NOAA NCEI Storm Events Database·~75-day publication lag
Round Rock, located in Williamson County, has experienced 15 hail events of 1 inch or larger over the past 10 years, with 7 of those classified as significant storms producing hail 1.5 inches or greater. The largest recorded hailstone in the area measured 2.5 inches in diameter—roughly the size of a tennis ball. This frequency of approximately 1.5 events per year places Round Rock in an active hail corridor for central Texas.
Hail season in Round Rock peaks from April through June, when Gulf moisture collides with drier continental air masses moving from the west. May is particularly active for afternoon and evening thunderstorms capable of producing hail. The secondary hail months of March and July account for additional storm activity, though at lower frequency than the peak season window.
Annual frequency — last 10 years
When hail hits — monthly pattern
Avg events per month · all years · NOAA data
All recorded hail events
Of 87 recorded events, 43 (49%) reached 1.5" or larger — the threshold for likely functional damage on standard asphalt shingles.
A thunderstorm produced golf ball size hail between Leander and Cedar Park.
A thunderstorm produced two inch diameter hail in the Carneros Ranch neighborhood in Leander.
A thunderstorm produced golf ball size hail northeast of Hutto.
A thunderstorm produced quarter size hail at the intersection of Paloma Lake Blvd. and Diego Dr. on …
A thunderstorm produced penny size hail in Hutto.
A thunderstorm produced half dollar size hail northeast of Elgin.
A thunderstorm produced four inch diameter hail off of CR 460 in Coupland.
A thunderstorm produced golf ball size hail on the eastside of Hutto.
A thunderstorm produced quarter to golf ball size hail on the north side of Elgin.
A thunderstorm produced quarter size hail southeast of Elgin.
A thunderstorm produced quarter size hail at the intersection of FM 1431 and I-35 in Round Rock.
A thunderstorm produced golf ball size hail in Cedar Park.
A thunderstorm produced penny size hail in Leander.
A thunderstorm produced quarter size hail in Jollyville.
A thunderstorm produced dime to quarter size hail at the Brushy Creek RV Park between Hutto and Coup…
A thunderstorm produced nickel size hail in Leander.
A thunderstorm produced ping pong ball size hail in Elgin.
A thunderstorm produced quarter size hail in Jollyville.
A thunderstorm produced penny size hail near Cedar Park.
A thunderstorm produced quarter size hail near the intersection of Hwy 79 and Hwy 130 west of Hutto.
A thunderstorm produced one to one and a quarter inch hail near the intersection of CR 405 and FM 16…
A thunderstorm produced quarter size hail near I-35 and Hwy 45 in Round Rock.
A thunderstorm produced quarter size hail near I-35 and Hwy 45 in Round Rock.
Round Rock-specific hail records rely on NOAA storm reports tied to precise locations; events affecting nearby Cedar Park and Taylor High School are documented separately by location. Williamson County as a whole has 19 recorded hail events in NOAA archives, providing context for regional storm patterns, though individual city-level reporting density may vary based on where damage or eyewitness accounts were documented.
NOAA Storm Events Database source