◆ GRAND RIVER, IA HAIL HISTORY · DECATUR COUNTY
Grand River, IA hail history & hail map
Grand River, Iowa has had 6 hail events in the past 5 years, with hail up to 2.00″ (Golf Ball). Most recent: Jun 11, 2026. Free hail map, storm dates and NWS/CoCoRaHS reports.
✓ Data compiled by a degreed meteorologist from NOAA & NWS sources
6Hail events in the past 5 years
2.00″Largest recorded hail · Golf Ball
2.00″Largest ground report (within 3 mi)
1.75″Largest radar-estimated hail
Radar hail swaths (NOAA MRMS MESH) in the past 5 years over Grand River, shaded by hail size; blue dots are ground reports.
Recent hail storm dates in Grand River
| Date | Peak hail | Sources |
|---|---|---|
| Jun 11, 2026 | 1.75″ Golf Ball | Radar 1.75″ |
| May 19, 2025 | 2.00″ Golf Ball | 1 ground report (max 2.00″) |
| Jun 26, 2024 | 1.25″ Half Dollar | Radar 1.25″ |
| Apr 30, 2024 | 1.00″ Quarter | Radar 1.00″ |
| Sep 18, 2022 | 1.00″ Quarter | Radar 1.00″ |
| Jun 17, 2022 | 0.75″ Penny | Radar 0.75″ |
More Iowa hail history
Events count days with NOAA MRMS radar hail over Grand River (40.820, -93.960) 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.