Boulder hail storm history
Boulder County·NOAA NCEI Storm Events Database·~75-day publication lag
Boulder, located in Boulder County on Colorado's Front Range, has experienced 1 documented hail event of 1 inch or larger over the past 10 years. The city's elevation and geography make it vulnerable to afternoon convective storms that track northeast from the Rocky Mountains, though large hail events remain infrequent compared to other Colorado regions.
Hail risk in Boulder peaks from May through July, with secondary activity in April and August. Most significant hail events occur between 2 p.m. and 7 p.m. Mountain Time, when afternoon convective storms develop and move across the Front Range toward Boulder County.
Annual frequency — last 10 years
When hail hits — monthly pattern
Avg events per month · all years · NOAA data
All recorded hail events
Of 40 recorded events, 5 (13%) reached 1.5" or larger — the threshold for likely functional damage on standard asphalt shingles.
Report from mping.
Picture of 1 inch hail on Twitter.
The report was from mping.
Boulder's hail event count is based on NOAA Storm Data records, which rely on trained spotters and reported damage. The city's low 10-year event frequency (0.1 events per year) reflects both genuine rarity and potential underreporting of smaller hail events that do not trigger formal damage assessments.
NOAA Storm Events Database source