Hail reports Montana
No hail has been reported anywhere in Montana during the last 24 hours. In an average year, Montana sees 236 hail reports, and the largest hailstone on record measured 4.50 inches. That stone fell at Roundup on Jun 26, 1996. The average is based on reports from 2005 through 2025, and the record goes back to 1996. Hail report data comes from National Weather Service Local Storm Reports filed by trained spotters.
as of
NCEI Storm Events data place Montana at 16 among 51 states and DC for average hail reports per year. Full state hail ranking
From 2005 through 2025, the Storm Events Database logs about 236 hail reports in Montana a year, across about 33 days.
Largest hailstones on record in Montana
| Diameter | Size | Place | Date |
|---|---|---|---|
| 4.50 inches | Grapefruit | Roundup, Musselshell County | Jun 26, 1996 |
| 4.50 inches | Grapefruit | Winifred, Fergus County | Jun 26, 1996 |
| 4.50 inches | Grapefruit | Weldon, McCone County | Jul 18, 1999 |
| 4.50 inches | Grapefruit | Glasgow, Valley County | Jul 21, 1999 |
| 4.50 inches | Grapefruit | Broadus, Powder River County | Jul 18, 2001 |
| 4.50 inches | Grapefruit | Vida, McCone County | Jul 20, 2001 |
| 4.50 inches | Grapefruit | Vida, McCone County | Jul 20, 2001 |
| 4.50 inches | Grapefruit | Alzada, Carter County | Jun 18, 2002 |
| 4.25 inches | Softball | Hinsdale, Valley County | Jul 11, 2004 |
| 4.25 inches | Softball | Roundup, Musselshell County | Jun 24, 2007 |
Record figures come from the Storm Events Database at NCEI, a reviewed log that trails live reports by 2 to 3 months. Records start in 1996 and averages cover 2005-2025.
Hail reports by month
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Reports | 0.0 | 0.0 | 0.0 | 1 | 27 | 86 | 82 | 34 | 5 | 0.0 | 0.0 | 0.0 |
Counties in Montana with the most hail reports
| County | Reports a year |
|---|---|
| Yellowstone | 15.4 |
| Valley | 13.7 |
| Powder River | 11.3 |
| Garfield | 8.7 |
| Carter | 8.5 |
| Rosebud | 8.4 |
| Phillips | 8.0 |
| Dawson | 7.4 |
| Roosevelt | 7.3 |
| Big Horn | 7.2 |
Cities in Montana with hail data
Montana counties with hail reports in 2026
- Cascade County3 · 1.00 inches
- Judith Basin County2 · 1.00 inches
- Lewis and Clark County1 · 0.50 inches
A county earns a spot here as soon as one report in the period is filed.
Recent days with reports in Montana
National Weather Service offices file Local Storm Reports; the Iowa Environmental Mesonet of Iowa State University relays them to this page, where they appear as live spotter reports. Under 17 U.S.C. 105, no copyright attaches to the government-produced figures on this page, including reports, alerts, station observations, and normals, which were created by the National Weather Service and other NOAA offices. The notice that 17 U.S.C. 403 requires appears in this sentence. It does not imply endorsement by or affiliation with those agencies. See: Data sources and attribution.