Hail history for Cass County, Iowa
Every NOAA hail report filed in Cass County since 1971, with preliminary National Weather Service reports to November 3, 2026.
Readout · Cass County
- Last hail
- Sep 6, 2026
- 1.00 in, quarter size · preliminary
- Hail days, last 5 years
- 7
- since Nov 3, 2021 · 7 reports
- Largest ever
- 3.00 in
- teacup · Sep 18, 2010
175 reports on 95 days since 1971 · #29 of 100 Iowa counties
Hail map · Cass County
- Under 1 in
- 1–1.75 in
- 1.75–2.5 in
- 2.5–4 in
- 4 in +
- No size
For homeowners
Roof damage after hail? Get a free inspection
Hail bruises shingles and cracks seals in ways you can't see from the ground, and most insurers set a claim deadline after the storm. The latest hail report in Cass County is from September 6, 2026. A local roofer can check and document it at no cost.
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What the record says about Cass County
The latest hail report in Cass County is from September 6, 2026, 1.00 in (quarter size). Since November 3, 2021 there have been 7 separate hail days; the biggest stones in that time were 2.00 in on April 30, 2024.
Over the 20 years 2006–2025, Cass County logged 63 reports on 42 hail days, about 3.1 reports a year. That is 15% less than the median Iowa county (3.7 a year) and ranks #29 of 100 Iowa counties for all-time reports. Cass County holds 1% of all 16,032 hail reports in Iowa.
13% of reports with a size were 2 inches (hen egg) or larger, against 7% for the median Iowa county. The largest hail on record here is 3.00 in (teacup) on September 18, 2010 near 4.73 W Massena Swain Arpt.
Reports were down 76% in 2016–2025 (12) compared with 2006–2015 (51). The busiest year was 2001, with 28 reports on 7 days. Hail here peaks in May (30% of reports); 70% fall between April and June.
Reports a year 2006–2025 average
- Cass County 3.1
- Median Iowa county 3.7
Hail days 2006–2025
- Cass County 42
- Median Iowa county 39.5
Share 2 in or larger of sized reports
- Cass County 13%
- Median Iowa county 7%
Hail over time
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Total |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 | 1 | 1 | |||||||||||
| 2025 | 1 | 1 | 2 | ||||||||||
| 2024 | 1 | 1 | 2 | ||||||||||
| 2023 | 0 | ||||||||||||
| 2022 | 1 | 1 | 2 | ||||||||||
| 2021 | 1 | 1 | |||||||||||
| 2020 | 0 | ||||||||||||
| 2019 | 0 | ||||||||||||
| 2018 | 1 | 2 | 3 | ||||||||||
| 2017 | 1 | 1 | 2 |
Hail days since Nov 3, 2021
| Date | Reports | Largest | Storm page |
|---|---|---|---|
| Sep 6, 2026 | 1 | 1.00 in | View |
| Jun 15, 2025 | 1 | 1.50 in | — |
| Apr 17, 2025 | 1 | 1.00 in | — |
| May 21, 2024 | 1 | 1.00 in | — |
| Apr 30, 2024 | 1 | 2.00 in | — |
| Sep 17, 2022 | 1 | 1.75 in | — |
| Jun 14, 2022 | 1 | 0.75 in | — |
Largest hail on record
| Date | Size | Location | Damage | Time · source |
|---|---|---|---|---|
| Sep 18, 2010 | 3.00 inteacup | 4.73 W Massena Swain Arpt | $25K | 22:16 local · NCEI |
| May 13, 2001 | 3.00 inteacup | Atlantic | $75K | 08:02 local · NCEI |
| Aug 5, 2000 | 3.00 inteacup | Marne | $25K | 19:49 local · NCEI |
| Apr 14, 1994 | 3.00 inteacup | Griswold | $500K | 19:56 local · NCEI |
| Aug 5, 2000 | 2.75 inbaseball | 6 S Anita | $10K | 20:25 local · NCEI |
Sizes filed before 1996 are often rough estimates (round numbers like 7.00 or 8.00 in) without an exact spot; they are shown as NOAA filed them.
Size of every report
- Under 1 in 59 34%
- 1–2 in 94 54%
- 2 in + 22 13%
Most recent reports
| Date | Size | Location | Time · source |
|---|---|---|---|
| Sep 6, 2026 | 1.00 inquarter | 2 N Atlantic | 20:31 UTC · NWS prelim. |
| Jun 15, 2025 | 1.50 inping pong ball | 0.86 NE Griswold | 19:55 local · NCEI |
| Apr 17, 2025 | 1.00 inquarter | 0.52 W Lewis | 19:14 local · NCEI |
| May 21, 2024 | 1.00 inquarter | 3.61 SSE Cumberland | 14:10 local · NCEI |
| Apr 30, 2024 | 2.00 inhen egg | 2.6 W Massena Swain Arpt | 15:37 local · NCEI |
| Sep 17, 2022 | 1.75 ingolf ball | 0.86 NE Griswold | 19:58 local · NCEI |
| Jun 14, 2022 | 0.75 inpenny | 0.69 N Atlantic | 21:34 local · NCEI |
| Jun 18, 2021 | 1.25 inhalf dollar | 1.25 ENE Atlantic | 22:32 local · NCEI |
| Aug 31, 2018 | 2.00 inhen egg | 0.86 SE Marne | 21:27 local · NCEI |
| Aug 31, 2018 | 1.00 inquarter | 0.86 SE Marne | 21:21 local · NCEI |
| May 1, 2018 | 1.00 inquarter | 3.61 NNE Marne | 02:56 local · NCEI |
| Jun 15, 2017 | 1.00 inquarter | 3.7 W Cumberland | 18:22 local · NCEI |
Cities and towns in Cass County
Smaller places with fewer than 10 reports
These places have too few reports for a page of their own, so their record lives here.
| Place | Reports | Hail days | Latest |
|---|---|---|---|
| Cumberland | 9 | 9 | Jun 3, 2014 |
| Wiota | 6 | 5 | May 25, 2008 |
Questions about hail in Cass County
How often does it hail in Cass County, Iowa?
175 hail reports have been logged in Cass County since 1971. Over the 20 years 2006–2025 that averages 3.1 reports a year. That ranks #29 of 100 Iowa counties by number of reports.
When is hail season in Cass County?
Most reports come in May, June, April. May alone accounts for 30% of all reports.
What is the largest hail recorded in Cass County?
3.00 in (teacup size) on September 18, 2010 near 4.73 W Massena Swain Arpt. 13% of reports here were 2 inches or larger.
When did it last hail in Cass County?
The most recent report in this data is from September 6, 2026 (1.00 in). Final NOAA data runs to July 31, 2026; preliminary NWS reports run to November 3, 2026.
How many hail storms has Cass County had in the last five years?
7 separate days with hail reports since November 3, 2021, adding up to 7 reports. The most recent was September 6, 2026.
Where does this hail data come from?
Hail reports come from the NOAA NCEI Storm Events Database, which the National Weather Service compiles from spotter, public, law enforcement and media reports. Recent days use preliminary NWS Local Storm Reports via the Iowa Environmental Mesonet until NOAA publishes final data. Only reported hail is counted, so areas with fewer people tend to have fewer reports.