◆ ALTOONA, IA HAIL HISTORY · POLK COUNTY
Altoona, IA hail history & hail map
Altoona, Iowa has had 7 hail events in the past 5 years, with hail up to 1.25″ (Half Dollar). Most recent: Sep 8, 2026. Free hail map, storm dates and NWS/CoCoRaHS reports.
✓ Data compiled by a degreed meteorologist from NOAA & NWS sources
7Hail 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 Altoona, shaded by hail size; blue dots are ground reports.
Recent hail storm dates in Altoona
| Date | Peak hail | Sources |
|---|---|---|
| Sep 8, 2026 | 1.00″ Quarter | Radar 1.00″ · 1 ground report (max 0.88″) |
| May 19, 2025 | 1.00″ Quarter | 2 ground reports (max 1.00″) |
| Jul 30, 2024 | 0.75″ Penny | Radar 0.75″ |
| Jul 15, 2024 | 1.25″ Half Dollar | Radar 1.25″ |
| Apr 19, 2023 | 0.25″ Small | 1 ground report (max 0.25″) |
| Apr 5, 2023 | 0.88″ Nickel | Radar 0.75″ · 1 ground report (max 0.88″) |
| Mar 6, 2022 | 1.00″ Quarter | Radar 0.75″ · 1 ground report (max 1.00″) |
More Iowa hail history
Events count days with NOAA MRMS radar hail over Altoona (41.640, -93.450) 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.