Louisville hail storm history
Boulder County·NOAA NCEI Storm Events Database·~75-day publication lag
Louisville, located in Boulder County on Colorado's Front Range, has experienced 3 hailstorms with hail 1 inch or larger over the past 10 years. The town's position along the eastern slope of the Rocky Mountains places it in a zone where afternoon convective storms regularly move northeast from the mountains, creating conditions for hail development during the warmer months.
Hail risk in Louisville peaks between May and July, with secondary activity in April and August. Storm activity is concentrated in the afternoon hours between 2 p.m. and 7 p.m. Mountain Time, when daytime heating of the Front Range foothills strengthens updrafts in passing thunderstorms. The largest recorded hailstone in Louisville measured 1 inch in diameter, consistent with the town's typical severe weather profile.
Annual frequency — last 10 years
When hail hits — monthly pattern
Avg events per month · all years · NOAA data
All recorded hail events
Of 26 recorded events, 8 (31%) reached 1.5" or larger — the threshold for likely functional damage on standard asphalt shingles.
The report was from mPING.
Louisville's 3 documented hail events over 10 years reflect the lower reporting density for smaller municipalities in NOAA's severe weather database. Boulder County as a whole has 7 documented hail events in NOAA records, providing broader context for regional hail activity patterns. Recent event data is more reliable than historical records prior to 2015.
NOAA Storm Events Database source