Fallon County was hit as recently as 2026-06-27, 34 days ago. Fallon County is hit in most years, and usually several times over. The largest stone on record here is 3 inches, a teacup and 3 times the National Weather Service's 1 inch severe criterion, reported on 2026-06-02 near Webster.
Colored swath = NOAA MRMS radar-estimated hail size; dots = NOAA SPC reports in Montana. Radar-indicated, not a guarantee of damage.
The last hail here fell on 2026-06-27, around Webster. A free SwathIQ account -- hand-reviewed, invite within 24-48h -- pulls Fallon County 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 ->NOAA's Storm Prediction Center has logged 41 separate hail days here since 2010 -- 2.4 a year over 17 years of record. Those days carry 79 separate reports between them, two or three on a typical one. 2 of those 17 years produced none at all. The busiest single year was 2013, with 6 hail days. The last five years track the long-run rate, with 12 days since 2022.
7 of the 41 days reached 2 inches or more -- 17%, or about one hail day in 6, the last on 2026-06-02. Those big days do not follow the county's usual calendar: most of them fall in June, not July. 20 of the 41 days reached golf-ball size, 1.75 inches or bigger.
Across the whole of Montana, see the Montana hail map and history.
Reports cluster nearest Baker -- 21 of the county's 41 hail days -- then Ollie (9), Webster (7), Plevna (7) and Ismay (3). That one town is named on 51% of them. Beyond those, NOAA names Medicine Rocks S, Westmore and Willard on more than one hail day apiece.
| Place | Hail days since 2010 | Largest stone |
|---|---|---|
| 20 NNE Baker | 6 | 1.75″ |
| 3 Wsw Ollie | 6 | 1.75″ |
| Baker | 4 | 1.75″ |
| 8 Ese Webster | 2 | 2.00″ |
| 3 Sse Plevna | 2 | 1.75″ |
The season runs May through July: 35 of the 41 hail days on record fall in those 3 months (85%). July is the single busiest month, with 20 of them (49%). That peak closes the window: the season builds all the way to its worst month and then stops. Hail has also been reported in August and September, outside that window. Reports span 5 of the 12 calendar months; the other 7 have never produced one.
| Month | Hail days |
|---|---|
| May | 3 |
| June | 12 |
| July | 20 |
| August | 3 |
| September | 3 |
That day put 2 reports on the map, the biggest 1.75 inches near Webster. 2 hail days have already been reported this year.
| Date | Max hail | Reports |
|---|---|---|
| 2026-06-27 | 1.75″ | 2 |
| 2026-06-02 | 3.00″ | 1 |
| 2025-07-25 | 1.25″ | 2 |
| 2025-07-20 | 1.00″ | 1 |
| 2025-06-25 | 1.75″ | 2 |
| 2025-06-20 | 2.00″ | 1 |
| 2024-05-29 | 1.25″ | 1 |
| 2023-07-11 | 1.75″ | 3 |
The colored swath is NOAA's MRMS radar estimate of the largest hail per ~1 km cell; the dots are SPC ground reports. Yellow is about an inch, red 1.5 to 2″, purple 2″ and up (hail size vs roof damage). On this county's worst day the reports reached 3 inches, which is the purple band. Look up a street address with the hail history by address tool.
The nearest counties with a page of their own, over the state line included: Wibaux County (28 hail days), Prairie County (33), Custer County (43), Slope County, North Dakota (23) and Bowman County, North Dakota (37). Fallon County sits in between.
Wibaux County · Prairie County · Custer County · Slope County, North Dakota · Bowman County, North Dakota
Back to the Montana hail map or the U.S. hail map.
Data & method: NOAA/NWS Storm Prediction Center reports + NOAA MRMS MESH radar, Fallon County, Montana only. Radar-indicated and observation-based -- informational only, not a guarantee of damage or a valid claim.