Hail history for Allamakee County, IA

Allamakee County has 96 recorded hail events in the NOAA Storm Events Database — 48 of them 1″ or larger and 7 at 2″ or larger. The largest on record: 2.5″ (tennis ball) on May 11, 2000.

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 96 since 1958

1″ or larger 48 NWS severe threshold

2″ or larger 7 hen egg class and up

Largest recorded 2.5″ tennis ball · May 11, 2000

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 Allamakee County

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

Most recent recorded events

Latest 8 of 96 recorded events · data through April 2026
Date	Size	Comparable to
April 17, 2026	1.0″	Quarter
April 17, 2026	1.0″	Quarter
September 21, 2024	0.88″	Nickel
April 13, 2018	0.88″	Nickel
May 17, 2017	0.75″	Penny
June 29, 2015	0.88″	Nickel
June 29, 2015	1.0″	Quarter
June 29, 2015	1.0″	Quarter

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

From the storm reports

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

April 17, 2026 · 1.0″ (quarter)

The public reported quarter sized hail in Harpers Ferry.

September 4, 2012 · 2.0″ (hen egg)

Up to 2 inch diameter hail fell in Dorchester.

September 4, 2012 · 1.75″ (golf ball)

Golf ball sized hail fell in New Albin.

Events by decade

1950s	1960s	1970s	1980s	1990s	2000s	2010s	2020s
1	2	3	1	14	50	22	3

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 Allamakee County

Has it ever hailed in Allamakee County?

Yes — 96 hail events have been recorded for Allamakee County, IA in the NOAA Storm Events Database since 1958, including 48 of 1″ (quarter size) or larger.

When did it last hail in Allamakee County?

The most recent recorded hail event for Allamakee County, IA is April 17, 2026, 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 Allamakee County?

2.5″ (tennis ball), recorded on May 11, 2000. Hail that size meets or exceeds the National Weather Service severe threshold. 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.