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Hail history for Contra Costa County, CA

12 hail reports in Contra Costa County since 2006 on 7 days. The largest stones measured 0.5 in (marble) on Mar 3, 2018.

Cities in Contra Costa County

• Concord
  6 hail days
• Richmond
  9 hail days
• San Ramon
  7 hail days
• Walnut Creek
  10 hail days
• Danville
  7 hail days
• Martinez
  5 hail days
• Pleasant Hill
  6 hail days
• San Pablo
  5 hail days
• Lafayette
  11 hail days
• Bay Point
  5 hail days
• Orinda
  10 hail days
• Moraga
  11 hail days
• Alamo
  7 hail days
• El Sobrante
  5 hail days
• Clayton
  7 hail days
• Blackhawk
  6 hail days
• Contra Costa Centre
  7 hail days
• Waldon
  7 hail days
• Saranap
  10 hail days
• Kensington
  6 hail days
• Vine Hill
  6 hail days
• North Richmond
  6 hail days
• Pacheco
  6 hail days

Recent hail in Contra Costa County

No hail was reported in Contra Costa County in the last two years.

Hail days in Contra Costa County by year

When hail season peaks in Contra Costa County

Damaging thunderstorm winds in Contra Costa County

3 reports of damaging thunderstorm wind in Contra Costa County since 2006, on 2 days. The strongest measured gust was 63 mph on Aug 16, 2020.

Severe thunderstorm wind means gusts of 58 mph or more, or wind that caused damage. Measured gusts come from weather stations; estimated ones from spotters and damage surveys.

Filing a roof or car hail claim?

Insurers ask for the date of loss. The dates on this page are when hail was reported near Contra Costa County; hail can hit one street and miss the next, so a report is not proof of damage at your address. A licensed roofer or your insurance adjuster can inspect the roof. Many policies set a time limit for filing a claim — check yours.

Data: NOAA NCEI Storm Events Database (final records through Jun 30, 2026) and National Weather Service Local Storm Reports (preliminary, since then).