Montana Hail Map & History
Montana was hit as recently as 2026-09-13, 1 day ago. NOAA's Storm Prediction Center has logged 479 separate hail days in Montana since 2010, across 3,189 individual storm reports. 117 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.
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See call-center options ->Hail history in Montana
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.
When it hails in Montana
Montana's busiest hail month is July, with 172 of its 479 hail days on record. June through August holds 403 of them, 84% of the record.
| Month | Hail days since 2010 |
|---|---|
| April | 3 |
| May | 52 |
| June | 149 |
| July | 172 |
| August | 82 |
| September | 21 |
Top Montana counties by hail frequency
| County | Hail days since 2010 | Largest stone |
|---|---|---|
| Valley | 63 | 4.00″ |
| Carter | 62 | 4.25″ |
| Powder River | 61 | 4.25″ |
| Yellowstone | 54 | 3.00″ |
| Rosebud | 50 | 2.75″ |
| Roosevelt | 49 | 4.00″ |
Montana hail history by county
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 · Roosevelt County · Garfield 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 · Lewis and Clark County · Missoula County · Flathead County · Teton County · Carbon County · Golden Valley County · Hill County · Ravalli County · Blaine County · Gallatin County · Jefferson County · Wheatland County · Powell County · Park County · Toole County
Recent Montana hail days
| Date | Max hail | Reports |
|---|---|---|
| 2026-09-13 | 1.00″ | 2 |
| 2026-09-06 | 3.25″ | 23 |
| 2026-09-02 | 1.00″ | 1 |
| 2026-08-29 | 1.00″ | 1 |
| 2026-08-23 | 1.00″ | 2 |
| 2026-08-17 | 1.00″ | 1 |
| 2026-08-14 | 1.00″ | 1 |
| 2026-08-11 | 1.75″ | 1 |
How to read the Montana map
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.
Nearby states
Mississippi · Virginia · Wisconsin · Tennessee · Florida · Alabama
FAQ
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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.