Hail history for Contra Costa County, California
Every NOAA hail report filed in Contra Costa County since 1983, with preliminary National Weather Service reports to November 3, 2026.
Readout · Contra Costa County
- Last hail
- Apr 6, 2020
- 0.25 in, pea size
- Hail days, last 5 years
- 0
- since Nov 3, 2021 · 0 reports
- Largest ever
- 0.75 in
- penny · Apr 29, 1983
14 reports on 8 days since 1983 · #24 of 47 California counties
Hail map · Contra Costa County
- Under 1 in
- 1–1.75 in
- 1.75–2.5 in
- 2.5–4 in
- 4 in +
- No size
For homeowners
Concerned about your roof after hail?
Send a request to Moxisync Labs for review. The latest hail report in Contra Costa County is from April 6, 2020. We’re building local roofer coverage. Submitting a request does not guarantee a quote or book an inspection.
Phone line opening soon
What the record says about Contra Costa County
The latest hail report in Contra Costa County is from April 6, 2020, 0.25 in (pea size). There has been no hail report here in the five years since November 3, 2021.
Over the 20 years 2006–2025, Contra Costa County logged 12 reports on 7 hail days, about 0.6 reports a year. That is 50% more than the median California county (0.4 a year) and ranks #24 of 47 California counties for all-time reports. Contra Costa County holds 1% of all 938 hail reports in California.
0% of reports with a size were 2 inches (hen egg) or larger, against 0% for the median California county. The largest hail on record here is 0.75 in (penny) on April 29, 1983.
Reports were up 1200% in 2016–2025 (12) compared with 2006–2015 (0). The busiest year was 2018, with 10 reports on 5 days. Hail here peaks in March (43% of reports); 36% fall between April and June.
Reports a year 2006–2025 average
- Contra Costa County 0.6
- Median California county 0.4
Hail days 2006–2025
- Contra Costa County 7
- Median California county 7
Share 2 in or larger of sized reports
- Contra Costa County 0%
- Median California county 0%
Hail over time
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Total |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 | 0 | ||||||||||||
| 2025 | 0 | ||||||||||||
| 2024 | 0 | ||||||||||||
| 2023 | 0 | ||||||||||||
| 2022 | 0 | ||||||||||||
| 2021 | 0 | ||||||||||||
| 2020 | 1 | 1 | |||||||||||
| 2019 | 1 | 1 | |||||||||||
| 2018 | 2 | 6 | 2 | 10 | |||||||||
| 2017 | 0 |
Largest hail on record
| Date | Size | Location | Time · source |
|---|---|---|---|
| Apr 29, 1983 | 0.75 inpenny | — | 17:30 local · NCEI |
| Apr 29, 1983 | 0.75 inpenny | — | 16:00 local · NCEI |
| Mar 3, 2018 | 0.50 inmarble | Concord | 12:24 local · NCEI |
| Apr 6, 2020 | 0.25 inpea | 2 NNW San Ramon | 10:57 local · NCEI |
| Feb 17, 2019 | 0.25 inpea | 1.71 SE Pleasant Hill | 17:50 local · NCEI |
Sizes filed before 1996 are often rough estimates (round numbers like 7.00 or 8.00 in) without an exact spot; they are shown as NOAA filed them.
Size of every report
- Under 1 in 14 100%
- 1–2 in 0 0%
- 2 in + 0 0%
Most recent reports
| Date | Size | Location | Time · source |
|---|---|---|---|
| Apr 6, 2020 | 0.25 inpea | 2 NNW San Ramon | 10:57 local · NCEI |
| Feb 17, 2019 | 0.25 inpea | 1.71 SE Pleasant Hill | 17:50 local · NCEI |
| Apr 16, 2018 | 0.25 inpea | 0.58 ESE Cowell | 12:40 local · NCEI |
| Apr 16, 2018 | 0.25 inpea | Orinda | 07:56 local · NCEI |
| Mar 3, 2018 | 0.25 inpea | 5 NW Danville | 13:35 local · NCEI |
| Mar 3, 2018 | 0.25 inpea | Lafayette | 13:07 local · NCEI |
| Mar 3, 2018 | 0.50 inmarble | Concord | 12:24 local · NCEI |
| Mar 3, 2018 | 0.25 inpea | Martinez | 11:55 local · NCEI |
| Mar 2, 2018 | 0.25 inpea | El Cerrito | 12:34 local · NCEI |
| Mar 2, 2018 | 0.25 inpea | Kensington | 10:22 local · NCEI |
| Feb 26, 2018 | 0.25 inpea | Pleasant Hill | 16:23 local · NCEI |
| Feb 22, 2018 | 0.25 inpea | Concord | 14:45 local · NCEI |
Smaller places with fewer than 10 reports
These places have too few reports for a page of their own, so their record lives here.
| Place | Reports | Hail days | Latest |
|---|---|---|---|
| Concord | 3 | 3 | Apr 16, 2018 |
| Walnut Creek | 3 | 3 | Mar 30, 2024 |
| Brentwood | 2 | 1 | Apr 29, 1983 |
| Danville | 1 | 1 | Apr 6, 2020 |
| El Cerrito | 1 | 1 | Mar 2, 2018 |
| Kensington | 1 | 1 | Mar 2, 2018 |
| Lafayette | 1 | 1 | Mar 3, 2018 |
| Martinez | 1 | 1 | Mar 3, 2018 |
| Pleasant Hill | 1 | 1 | Feb 26, 2018 |
Questions about hail in Contra Costa County
How often does it hail in Contra Costa County, California?
14 hail reports have been logged in Contra Costa County since 1983. Over the 20 years 2006–2025 that averages 0.6 reports a year. That ranks #24 of 47 California counties by number of reports.
When is hail season in Contra Costa County?
Most reports come in March, April, February. March alone accounts for 43% of all reports.
What is the largest hail recorded in Contra Costa County?
0.75 in (penny size) on April 29, 1983. 0% of reports here were 2 inches or larger.
When did it last hail in Contra Costa County?
The most recent report in this data is from April 6, 2020 (0.25 in). Final NOAA data runs to July 31, 2026; preliminary NWS reports run to November 3, 2026.
How many hail storms has Contra Costa County had in the last five years?
None: there has been no hail report in Contra Costa County since November 3, 2021. The last one was on April 6, 2020.
Where does this hail data come from?
Hail reports come from the NOAA NCEI Storm Events Database, which the National Weather Service compiles from spotter, public, law enforcement and media reports. Recent days use preliminary NWS Local Storm Reports via the Iowa Environmental Mesonet until NOAA publishes final data. Only reported hail is counted, so areas with fewer people tend to have fewer reports.