Great Falls hail storm history
Cascade County·NOAA NCEI Storm Events Database·~75-day publication lag
Great Falls is located in the Missouri River valley of central Cascade County, where the Rocky Mountain Front transitions into the northern High Plains. This geographic position creates a complex convective environment where hail-producing storms develop along the foothills and track eastward across the county. As a result, Great Falls experiences documented hail events throughout the spring and summer months.
Check if your roof was damaged by recent hail
Hail activity in Great Falls peaks during June and July, with secondary risk extending through May and August. Storms that produce hail typically form along the Rocky Mountain Front and move across Cascade County, with the high elevation and semi-arid climate creating conditions favorable for severe convection during the transition seasons. While hail events are less frequent in this region than in eastern Montana, individual storms can still produce significant damage when they occur.
Annual frequency — last 10 years
When hail hits — monthly pattern
Avg events per month · all years · NOAA data
All recorded hail events
Of 75 recorded events, 26 (35%) reached 1.5" or larger — the threshold for likely functional damage on standard asphalt shingles.
Public reported 1 inch hail. Time of report estimated via radar.
Facebook report of 1 inch hail in Tiger Butte.
Corrects previous hail report from 9 WNW Monarch. Facebook report of 1 inch hail in Tiger Butte.
Public report with image of quarter sized hail next to a quarter for reference.
Public reports quarter sized hail. Gusty winds were also observed, which blew around items at the re…
A photo submitted from the public showed estimated 2.5 inch hail, along with damage to a vehicle win…
Spotter reported quarter size hail in Belt.
Reports on social media of vehicles in Wayne being dented from large hail.
Employee reported one inch hail on southeast side of Great Falls. Started off as small hail.
Pictures submitted of large hail (1 inch) in Black Eagle.
Video showing hail was taken in Sun River. Person who took the video reported up to quarter sized ha…
Report from mping.
Posted on Twitter.
A lot of quarter to ping pong sized hail. Also, reports wind shredded pine trees and a lot of branch…
Public reports 1 inch diameter hail via mping.
A COOP observer reported quarter sized (1 inch in diameter) hail.
Trained spotter reported 1 inch sized hail at 1 W Sun Prairie.
Quarter size hail reported on the northwest side of Great falls.
Hail of 1 inch diameter measured on north side of runway at Malmstrom Air Force Base.
Storm started around 230 PM and lasted until 245 PM. Hail was mostly pea to penny size. The larger h…
Trained spotter reported quarter size hail.
Spotter reported quarter-sized hail.
Quarter size hail reported in the Big Bend/Fox Farm area of Great Falls.
Hail reported 8 miles SE of Ulm.
A thunderstorm dropped 1 inch diameter hail at Belt 10WNW and at Belt 7NW.
A thunderstorm dropped 1 inch diameter hail near Benefis East in Great Falls. Also, a 1.75 inch diam…
A thunderstorm dropped 1.5 inch diameter hail in Great Falls. The storm produced reports of hail ran…
A severe thunderstorm dropped 1.75 inch diameter hail at Highwood 10SE and 2 inch diameter hail at H…
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 ↗