Hail history for Cass County, IA

Cass County has 174 recorded hail events in the NOAA Storm Events Database — 115 of them 1″ or larger and 22 at 2″ or larger. The largest on record: 3.0″ (tea cup) on September 18, 2010.

Records 1950–present Data through April 2026 Peak month May

Core sample · every recorded event, 1955–2026

Mark size = measured hail diameter; slivers are events with no recorded size. Amber ≥2″, red ≥2.75″ (baseball class). Denser recent decades partly reflect better reporting, not only more storms.

Recorded events 174 since 1971

1″ or larger 115 NWS severe threshold

2″ or larger 22 hen egg class and up

Largest recorded 3.0″ tea cup · September 18, 2010

Read the record honestly: Storm Events contains what was reported to the National Weather Service. Sparse or rural counties under-report, and coverage improved sharply after the mid-1990s — a quiet-looking stretch is not proof nothing fell.

When it hails in Cass County

Recorded events by month, 1950–present. The amber bar marks Cass County's peak: May.

Most recent recorded events

Latest 8 of 174 recorded events · data through April 2026
Date	Size	Comparable to
June 15, 2025	1.5″	Ping-pong ball
April 17, 2025	1.0″	Quarter
May 21, 2024	1.0″	Quarter
April 30, 2024	2.0″	Hen egg
September 17, 2022	1.75″	Golf ball
June 14, 2022	0.75″	Penny
June 18, 2021	1.25″	Half dollar
August 31, 2018	2.0″	Hen egg

Looking for a specific storm? Use the did-it-hail date lookup for Cass County.

From the storm reports

Narratives as filed with the NOAA Storm Events Database (public records; lightly trimmed for length).

June 15, 2025 · 1.5″ (ping-pong ball)

Multiple hail sizes observed with largest up to ping pong ball sized.

April 30, 2024 · 2.0″ (hen egg)

Delayed report, time estimated by radar.

August 31, 2018 · 2.0″ (hen egg)

Trained spotter reported ping pong ball sized hail.

Events by decade

1950s	1960s	1970s	1980s	1990s	2000s	2010s	2020s
0	0	2	18	18	100	29	7

The climb across decades is largely a reporting story: spotter networks, radar, and digital filing pulled far more storms into the record after the 1990s.

Questions about hail in Cass County

Has it ever hailed in Cass County?

Yes — 174 hail events have been recorded for Cass County, IA in the NOAA Storm Events Database since 1971, including 115 of 1″ (quarter size) or larger.

When did it last hail in Cass County?

The most recent recorded hail event for Cass County, IA is June 15, 2025, with 1.5″ (ping-pong ball) hail. The database is currently updated through April 2026, so a storm from the last few weeks may not appear yet. To check a specific day, use the did-it-hail date lookup.

What is the largest hail ever recorded in Cass County?

3.0″ (tea cup), recorded on September 18, 2010. Hail that size is destructive-class and typically damages roofs, vehicles, and siding. See how big that really is on the actual-size hail chart.

Does a recorded hail event mean my roof was damaged?

No. This page reports storm records, not damage. Hail size and damage vary block by block within a county, and only an inspection can establish what happened to a specific roof. If you suspect damage, talk to your insurer or a licensed roofer — they can pull the same NOAA records for your claim.

More Iowa hail history

All 99 Iowa counties, ranked by recorded hail →

Source: NOAA/NCEI Storm Events Database, public domain, updated monthly by NCEI — this site's copy runs through April 2026. HailHistory reports records; it does not give insurance advice or assess damage.