Hail history for Sioux County, IA

Sioux County has 256 recorded hail events in the NOAA Storm Events Database — 159 of them 1″ or larger and 15 at 2″ or larger. The largest on record: 2.75″ (baseball) on August 7, 1984.

Records 1950–present Data through April 2026 Peak month June

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 256 since 1961

1″ or larger 159 NWS severe threshold

2″ or larger 15 hen egg class and up

Largest recorded 2.75″ baseball · August 7, 1984

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 Sioux County

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

Most recent recorded events

Latest 8 of 256 recorded events · data through April 2026
Date	Size	Comparable to
September 21, 2025	0.75″	Penny
September 21, 2025	1.75″	Golf ball
June 14, 2025	1.0″	Quarter
June 2, 2025	1.75″	Golf ball
June 2, 2025	0.88″	Nickel
June 2, 2025	1.0″	Quarter
June 2, 2025	0.75″	Penny
June 2, 2025	1.5″	Ping-pong ball

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

From the storm reports

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

June 14, 2025 · 1.0″ (quarter)

Hail was accompanied by heavy rain and strong winds.

August 18, 2022 · 2.5″ (tennis ball)

Crop damage is an estimate from insured losses. Information provided by the United States Department of Agriculture.

August 16, 2002 · 2.5″ (tennis ball)

Large hail broke windows and damaged vehicles. The amount of damage was not known.

Events by decade

1950s	1960s	1970s	1980s	1990s	2000s	2010s	2020s
0	2	9	11	14	125	70	25

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 Sioux County

Has it ever hailed in Sioux County?

Yes — 256 hail events have been recorded for Sioux County, IA in the NOAA Storm Events Database since 1961, including 159 of 1″ (quarter size) or larger.

When did it last hail in Sioux County?

The most recent recorded hail event for Sioux County, IA is September 21, 2025, with 0.75″ (penny) 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 Sioux County?

2.75″ (baseball), recorded on August 7, 1984. 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.