Hail history for Alameda County, CA

Alameda County has 20 recorded hail events in the NOAA Storm Events Database — 0 of them 1″ or larger. The largest on record: 0.75″ (penny) on February 9, 1999.

Records 1950–present Data through April 2026 Peak month March

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 20 since 1999

1″ or larger 0 NWS severe threshold

2″ or larger 0 hen egg class and up

Largest recorded 0.75″ penny · February 9, 1999

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 Alameda County

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

Most recent recorded events

Latest 8 of 20 recorded events · data through April 2026
Date	Size	Comparable to
March 30, 2024	0.25″	Pea
March 15, 2021	0.25″	Pea
March 17, 2020	0.25″	Pea
January 16, 2020	0.13″	Pea
November 26, 2019	0.25″	Pea
January 20, 2019	0.25″	Pea
April 16, 2018	0.25″	Pea
April 16, 2018	0.25″	Pea

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

From the storm reports

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

March 30, 2024 · 0.25″ (pea)

Approximate location. Pea-sized hail was reported in the Walnut Creek area via social media.

February 9, 1999 · 0.75″ (penny)

Smal hail fell in and around the Oakland Zoo.

Events by decade

1950s	1960s	1970s	1980s	1990s	2000s	2010s	2020s
0	0	0	0	1	0	15	4

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 Alameda County

Has it ever hailed in Alameda County?

Yes — 20 hail events have been recorded for Alameda County, CA in the NOAA Storm Events Database since 1999, including 0 of 1″ (quarter size) or larger.

When did it last hail in Alameda County?

The most recent recorded hail event for Alameda County, CA is March 30, 2024, with 0.25″ (pea) 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 Alameda County?

0.75″ (penny), recorded on February 9, 1999. Hail that size is below the National Weather Service 1″ 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 California hail history

All 58 California 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.