Hail history for Stillwater County, MT

Stillwater County has 185 recorded hail events in the NOAA Storm Events Database — 134 of them 1″ or larger and 9 at 2″ or larger. The largest on record: 2.75″ (baseball) on August 11, 2019.

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 185 since 1958

1″ or larger 134 NWS severe threshold

2″ or larger 9 hen egg class and up

Largest recorded 2.75″ baseball · August 11, 2019

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 Stillwater County

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

Most recent recorded events

Latest 8 of 185 recorded events · data through April 2026
Date	Size	Comparable to
August 7, 2025	1.75″	Golf ball
June 13, 2025	1.5″	Ping-pong ball
June 13, 2025	1.75″	Golf ball
June 13, 2025	1.25″	Half dollar
June 13, 2025	1.0″	Quarter
August 6, 2024	1.0″	Quarter
August 6, 2023	1.5″	Ping-pong ball
July 24, 2022	1.0″	Quarter

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

From the storm reports

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

August 7, 2025 · 1.75″ (golf ball)

Large hail lasted 10 minutes.

August 11, 2019 · 2.0″ (hen egg)

Car windshields were broken along with four house windows.

June 6, 2011 · 2.75″ (baseball)

There was heavy damage to a car windshield.

Events by decade

1950s	1960s	1970s	1980s	1990s	2000s	2010s	2020s
10	1	0	1	22	54	80	17

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 Stillwater County

Has it ever hailed in Stillwater County?

Yes — 185 hail events have been recorded for Stillwater County, MT in the NOAA Storm Events Database since 1958, including 134 of 1″ (quarter size) or larger.

When did it last hail in Stillwater County?

The most recent recorded hail event for Stillwater County, MT is August 7, 2025, with 1.75″ (golf ball) 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 Stillwater County?

2.75″ (baseball), recorded on August 11, 2019. 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 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.