Hail history for Slope County, ND

Slope County has 96 recorded hail events in the NOAA Storm Events Database — 68 of them 1″ or larger and 8 at 2″ or larger. The largest on record: 4.5″ (grapefruit) on July 17, 2003.

Records 1950–present Data through April 2026 Peak month July

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 1981

1″ or larger 68 NWS severe threshold

2″ or larger 8 hen egg class and up

Largest recorded 4.5″ grapefruit · July 17, 2003

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 Slope County

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

Most recent recorded events

Latest 8 of 96 recorded events · data through April 2026
Date	Size	Comparable to
July 20, 2025	1.0″	Quarter
June 15, 2024	1.0″	Quarter
July 2, 2022	0.88″	Nickel
July 2, 2022	0.88″	Nickel
September 2, 2021	1.0″	Quarter
July 8, 2021	1.75″	Golf ball
July 8, 2021	1.75″	Golf ball
July 8, 2021	1.75″	Golf ball

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

From the storm reports

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

September 2, 2021 · 1.0″ (quarter)

The hail broke a skylight on a home.

July 10, 2016 · 2.75″ (baseball)

Crops and vehicles were extensively damaged from the baseball sized hail.

July 9, 2007 · 2.0″ (hen egg)

The ground was white with hail at conclusion. Minor damage to buildings was reported.

Events by decade

1950s	1960s	1970s	1980s	1990s	2000s	2010s	2020s
0	0	0	5	18	24	39	10

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 Slope County

Has it ever hailed in Slope County?

Yes — 96 hail events have been recorded for Slope County, ND in the NOAA Storm Events Database since 1981, including 68 of 1″ (quarter size) or larger.

When did it last hail in Slope County?

The most recent recorded hail event for Slope County, ND is July 20, 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 Slope County?

4.5″ (grapefruit), recorded on July 17, 2003. 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 North Dakota hail history

All 53 North Dakota 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.