Hail history for Grundy County, IA

Grundy County has 91 recorded hail events in the NOAA Storm Events Database — 51 of them 1″ or larger and 6 at 2″ or larger. The largest on record: 3.0″ (tea cup) on May 31, 1971.

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 91 since 1960

1″ or larger 51 NWS severe threshold

2″ or larger 6 hen egg class and up

Largest recorded 3.0″ tea cup · May 31, 1971

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 Grundy County

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

Most recent recorded events

Latest 8 of 91 recorded events · data through April 2026
Date	Size	Comparable to
September 22, 2025	1.0″	Quarter
May 19, 2024	1.0″	Quarter
July 28, 2023	1.0″	Quarter
August 19, 2022	1.0″	Quarter
August 19, 2022	1.5″	Ping-pong ball
June 15, 2022	1.0″	Quarter
July 11, 2020	1.0″	Quarter
June 28, 2019	1.0″	Quarter

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

From the storm reports

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

September 22, 2025 · 1.0″ (quarter)

Quarter sized hail reported by trained spotter.

August 19, 2022 · 1.5″ (ping-pong ball)

Delayed report via social media of ping pong ball sized hail north of Grundy Center. Time estimated by radar.

Events by decade

1950s	1960s	1970s	1980s	1990s	2000s	2010s	2020s
0	1	6	4	11	42	20	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 Grundy County

Has it ever hailed in Grundy County?

Yes — 91 hail events have been recorded for Grundy County, IA in the NOAA Storm Events Database since 1960, including 51 of 1″ (quarter size) or larger.

When did it last hail in Grundy County?

The most recent recorded hail event for Grundy County, IA is September 22, 2025, with 1.0″ (quarter) 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 Grundy County?

3.0″ (tea cup), recorded on May 31, 1971. 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.