Montana was hit as recently as 2026-07-18, 13 days ago. NOAA's Storm Prediction Center has logged 470 separate hail days in Montana since 2010, across 3,156 individual storm reports. 116 of those days brought hail 2 inches or larger, and the largest stone on record is 4.5 inches on 2015-07-04 near Havre, Hill.
Montana's High Plains east of the Divide -- Billings and Great Falls -- take frequent summer hail from afternoon storms. Pick a date below to see the NOAA radar swath and reports, or check a specific address.
Colored swath = NOAA MRMS radar-estimated hail size; dots = NOAA SPC reports in Montana. Radar-indicated, not a guarantee of damage.
A free SwathIQ account -- hand-reviewed, invite within 24-48h -- pulls Montana addresses inside a hail swath above your size threshold into a door-knock list you can export, scoped to your approved markets.
Get free access Check an addressOur US-based call center calls the homeowners in this storm and books roof inspections straight onto your calendar. You work the storm; we fill the schedule. We dial -- you do not have to knock a single door.
See call-center options ->Montana averages 28 reported hail days a year across 17 years of NOAA archive, about 7 of them carrying hail 2″ or larger -- the size that routinely totals roofs. Major metros watched here: Billings, Great Falls, Missoula, Bozeman.
Montana's busiest hail month is July, with 171 of its 470 hail days on record. June through August holds 397 of them, 84% of the record.
| Month | Hail days since 2010 |
|---|---|
| April | 3 |
| May | 52 |
| June | 149 |
| July | 171 |
| August | 77 |
| September | 18 |
| County | Hail days since 2010 | Largest stone |
|---|---|---|
| Valley | 63 | 4.00″ |
| Carter | 60 | 4.25″ |
| Powder River | 60 | 4.25″ |
| Yellowstone | 53 | 3.00″ |
| Rosebud | 50 | 2.75″ |
| Roosevelt | 48 | 4.00″ |
42 Montana counties have at least 13 NOAA hail days on record since 2010 -- enough archive signal for a page of their own. Ordered by hail days.
Valley County · Carter County · Powder River County · Yellowstone County · Rosebud County · Fergus County · Garfield County · Roosevelt County · Big Horn County · Cascade County · Custer County · McCone County · Stillwater County · Fallon County · Richland County · Dawson County · Phillips County · Judith Basin County · Prairie County · Sheridan County · Musselshell County · Petroleum County · Wibaux County · Glacier County · Chouteau County · Daniels County · Sweet Grass County · Flathead County · Lewis and Clark County · Missoula County · Teton County · Carbon County · Golden Valley County · Ravalli County · Blaine County · Hill County · Gallatin County · Jefferson County · Wheatland County · Park County · Powell County · Toole County
| Date | Max hail | Reports |
|---|---|---|
| 2026-07-18 | 1.00″ | 1 |
| 2026-07-17 | 1.00″ | 2 |
| 2026-07-16 | 1.75″ | 7 |
| 2026-07-14 | 2.50″ | 3 |
| 2026-07-07 | 1.50″ | 2 |
| 2026-07-05 | 1.75″ | 3 |
| 2026-07-02 | 1.00″ | 3 |
| 2026-06-27 | 2.00″ | 15 |
The colored swath is NOAA's MRMS radar estimate of the largest hail in each ~1 km cell; the dots are individual SPC ground reports. Yellow is around an inch, red is 1.5 to 2″, and purple is 2″ and up -- see how hail size maps to roof damage. Click any spot on the map to see the hail history at that point, or look up a full street address on the hail history by address tool. Today's nationwide activity is on today's hail report.
Mississippi · Virginia · Wisconsin · Tennessee · Florida · Alabama
Data & method: NOAA/NWS Storm Prediction Center reports + NOAA MRMS MESH radar, Montana only. Radar-indicated and observation-based -- informational only, not a guarantee of damage or a valid claim.