Longmont hail storm history
Boulder County·NOAA NCEI Storm Events Database·~75-day publication lag
Longmont sits along Colorado's Front Range in Boulder County, a corridor where afternoon convective storms tracking northeast from the Rocky Mountains create consistent hail risk. The city's elevation and position relative to mountain-driven storm systems expose it to repeated warm-season hail events.
Check if your roof was damaged by recent hail
Hail risk in Longmont peaks between May and July, with secondary activity in April and August. Most significant events occur during afternoon hours between 2 p.m. and 7 p.m. Mountain Time, when atmospheric instability is highest and storms move through the region most rapidly.
Annual frequency — last 10 years
When hail hits — monthly pattern
Avg events per month · all years · NOAA data
All recorded hail events
Of 102 recorded events, 20 (20%) reached 1.5" or larger — the threshold for likely functional damage on standard asphalt shingles.
Report from mping.
Report from Mping.
Hail up to the size of a half dollar fell for a duration of 6 minutes.
Size was estimated.
NOAA National Centers for Environmental Information Storm Events Database. Publication lag is approximately 75 days — current-year events may be incomplete.
NOAA Storm Events Database ↗