Castle Rock hail storm history
Douglas County·NOAA NCEI Storm Events Database·~75-day publication lag
Castle Rock, located in Douglas County, experienced 14 hail events of 1 inch or larger over the past 10 years, with an average of 1.4 events annually. The city sits on the Front Range where afternoon convective storms tracking northeast from the Rocky Mountains create consistent hail risk. The largest recorded hailstone in Castle Rock measured 2 inches in diameter.
Hail risk in Castle Rock peaks from May through July, when afternoon thunderstorms develop between 2 p.m. and 7 p.m. Mountain Time. April and August represent secondary risk months. Of the 14 documented 1-inch-or-larger events in the past decade, 3 produced hail of 1.5 inches or larger, indicating that while major hail events occur infrequently, they do happen in Castle Rock.
Annual frequency — last 10 years
When hail hits — monthly pattern
Avg events per month · all years · NOAA data
All recorded hail events
Of 82 recorded events, 17 (21%) reached 1.5" or larger — the threshold for likely functional damage on standard asphalt shingles.
The report was received from MPING.
Report from mping.
Hail up to 1.25 inches in diameter fell across the Palmer Divide from a supercell thunderstorm.
The report was from Mping.
Castle Rock hail data comes from NOAA storm reports for Douglas County, which has documented 16 total hail events in its records. Event counts for individual cities depend on reporting density and storm track proximity to populated areas; rural areas and periods with lower trained spotter coverage may have underreported events.
NOAA Storm Events Database source