Hail history for Big Horn County, WY

Big Horn County has 62 recorded hail events in the NOAA Storm Events Database — 38 of them 1″ or larger and 5 at 2″ or larger. The largest on record: 2.5″ (tennis ball) on August 7, 2009.

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 62 since 1961

1″ or larger 38 NWS severe threshold

2″ or larger 5 hen egg class and up

Largest recorded 2.5″ tennis ball · August 7, 2009

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 Big Horn County

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

Most recent recorded events

Latest 8 of 62 recorded events · data through April 2026
Date	Size	Comparable to
May 26, 2023	1.25″	Half dollar
May 25, 2023	1.0″	Quarter
May 17, 2022	1.0″	Quarter
June 19, 2019	0.88″	Nickel
July 27, 2018	1.25″	Half dollar
July 26, 2018	1.75″	Golf ball
May 31, 2018	0.88″	Nickel
June 12, 2017	1.5″	Ping-pong ball

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

From the storm reports

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

May 26, 2023 · 1.25″ (half dollar)

A trained spotter reported half dollar size hail the southwest of Byron, WY.

August 7, 2009 · 2.5″ (tennis ball)

Hail of 2.00 to 2.50 inches was measured on the east side of the Greybull River above Greybull.

August 7, 2009 · 2.0″ (hen egg)

Hailstones of golf ball size were numerous at a residence in Greybull. Some stones reached two inches in diameter.

Events by decade

1950s	1960s	1970s	1980s	1990s	2000s	2010s	2020s
0	1	1	0	7	31	19	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 Big Horn County

Has it ever hailed in Big Horn County?

Yes — 62 hail events have been recorded for Big Horn County, WY in the NOAA Storm Events Database since 1961, including 38 of 1″ (quarter size) or larger.

When did it last hail in Big Horn County?

The most recent recorded hail event for Big Horn County, WY is May 26, 2023, with 1.25″ (half dollar) 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 Big Horn County?

2.5″ (tennis ball), recorded on August 7, 2009. 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 Wyoming hail history

All 23 Wyoming 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.