Missoula hail storm history
Missoula County·NOAA NCEI Storm Events Database·~75-day publication lag
Missoula lies in the Clark Fork River valley of western Montana, where terrain and atmospheric conditions combine to create regular hail risk. The city sits partially shielded by the Rocky Mountains but remains exposed to hail from orographic convection and afternoon thunderstorms that develop over the surrounding mountain terrain. Missoula County has a documented history of hail events capable of damaging roofs and other structures.
Check if your roof was damaged by recent hail
Hail season in Missoula runs from May through August, with June and July representing the peak months for hail activity. During these months, daytime heating drives convective development over the surrounding mountain terrain, and orographic lifting can produce localized hail cells in a short distance around the city. May and August see secondary activity as spring and late-summer weather patterns create occasional severe thunderstorms.
Annual frequency — last 10 years
When hail hits — monthly pattern
Avg events per month · all years · NOAA data
All recorded hail events
Of 27 recorded events, 3 (11%) reached 1.5" or larger — the threshold for likely functional damage on standard asphalt shingles.
Hail estimated slightly over one inch in diameter was reported in Lolo, an event confirmed by at lea…
An NWS employee measured 1 inch hail near Frenchtown.
An NWS employee reported one inch hail in Missoula.
There were two reports of 1 hail near Clinton, followed by another near US-200 2 miles from Potomac,…
One inch hail was reported on the 'eastside' of Florence, MT.
Local reports between Stevensville and Florence, MT varied between 1 to 1.50 for hail size, with dam…
Several reports of 1.00 inch hail.
A severe thunderstorm developed close to Clinton, MT, and began a slow movement to the northeast ove…
A severe thunderstorm dropped hail up to two inches in diameter on a small rural community in the Ro…
A thunderstorm produced nickel to quarter-sized hail in the town of Bonner during the afternoon of t…
Local Firefighters on the Lolo Peak wildfire reported quarter sized hail with no damages.
A person from the public located in Missoula tweeted a photo of hail that appeared to be quarter siz…
A co-workers friend reports quarter size hail.
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 ↗