◆ GRASS VLY, MT HAIL HISTORY · MISSOULA COUNTY
Grass Vly, MT hail history & hail map
Grass Vly, Montana has had 2 hail events in the past 5 years, with hail up to 1.25″ (Half Dollar). Most recent: Aug 1, 2025. Free hail map, storm dates and NWS/CoCoRaHS reports.
✓ Data compiled by a degreed meteorologist from NOAA & NWS sources
2Hail events in the past 5 years
1.25″Largest recorded hail · Half Dollar
1.00″Largest ground report (within 3 mi)
1.25″Largest radar-estimated hail
Radar hail swaths (NOAA MRMS MESH) in the past 5 years over Grass Vly, shaded by hail size; blue dots are ground reports.
Recent hail storm dates in Grass Vly
| Date | Peak hail | Sources |
|---|---|---|
| Aug 1, 2025 | 1.00″ Quarter | Radar 0.75″ · 1 ground report (max 1.00″) |
| Jul 8, 2022 | 1.25″ Half Dollar | Radar 1.25″ |
More Montana hail history
All Montana cities & hail days →
Events count days with NOAA MRMS radar hail over Grass Vly (46.974, -114.211) or an NWS / CoCoRaHS hail report within 3 miles. Data window: NOAA MRMS radar hail swaths Oct 2021 – Nov 2026; NWS / NCEI Storm Events reports Nov 2024 – Jul 2026; CoCoRaHS volunteer reports Oct 2021 – present. Radar hail sizes are estimates, not ground truth; hail at any single address can differ.