Hail history for Sweet Grass County, MT

Sweet Grass County has 130 recorded hail events in the NOAA Storm Events Database — 84 of them 1″ or larger and 4 at 2″ or larger. The largest on record: 2.5″ (tennis ball) on June 13, 2013.

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 130 since 1955

1″ or larger 84 NWS severe threshold

2″ or larger 4 hen egg class and up

Largest recorded 2.5″ tennis ball · June 13, 2013

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 Sweet Grass County

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

Most recent recorded events

Latest 8 of 130 recorded events · data through April 2026
Date	Size	Comparable to
June 16, 2025	1.0″	Quarter
June 14, 2025	1.25″	Half dollar
July 4, 2022	1.0″	Quarter
May 19, 2020	0.75″	Penny
May 19, 2020	0.75″	Penny
August 11, 2019	1.0″	Quarter
August 11, 2019	1.0″	Quarter
August 11, 2019	1.0″	Quarter

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

From the storm reports

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

June 16, 2025 · 1.0″ (quarter)

Hail report.

June 26, 2014 · 1.75″ (golf ball)

Hail accumulated to 2 inches on the ground and was accompanied by 40 to 50 mph winds.

August 1, 2013 · 1.75″ (golf ball)

The winds were estimated at 60 mph. The hail and wind combination broke skylights and windows.

Events by decade

1950s	1960s	1970s	1980s	1990s	2000s	2010s	2020s
2	0	0	3	14	37	69	5

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 Sweet Grass County

Has it ever hailed in Sweet Grass County?

Yes — 130 hail events have been recorded for Sweet Grass County, MT in the NOAA Storm Events Database since 1955, including 84 of 1″ (quarter size) or larger.

When did it last hail in Sweet Grass County?

The most recent recorded hail event for Sweet Grass County, MT is June 16, 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 Sweet Grass County?

2.5″ (tennis ball), recorded on June 13, 2013. 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 Montana hail history

All 56 Montana 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.