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Flood in Sonoma County, California
300 floods and flash floods events in the NCEI Storm Events record, 1950 to 2026. Event types counted: Flood, Flash Flood, Coastal Flood, Lakeshore Flood.
NCEI notes that Storm Data is compiled from a variety of sources including the National Weather Service, other federal, state and local agencies, the media and the public; that property and crop damage figures are estimates; and that some events are recorded by NWS forecast zone rather than by county. FEMA notes that NFIP claim records are redacted and aggregated to protect the privacy of policyholders. Storm records through 30 Jun 2026.
NCEI records 300 flood events in Sonoma County, California, between 1950 and 2026, spread over 23 years.
February is the busiest month, with 128 of the recorded events. The last 20 years account for 283 events against 17 in the 20 years before, a change that reflects reporting practice as much as weather.
The county holds 4.2% of the 7,136 flood events recorded in California; its 19.0 per 100 square miles compares with 4.6 statewide.
NCEI attributes 6 deaths in the county to floods and flash floods.
Compared with California
| Measure | Sonoma County | California | US |
|---|---|---|---|
| Flood events since 1950 | 300 | 7,136 | 183,559 |
| Per 100 square miles | 19.0 | 4.6 | 5.2 |
| Per 10,000 residents | 6.2 | 1.8 | 5.5 |
| Deaths recorded | 6 | 121 | 2,961 |
| Busiest month | February | January | June |
By year
Seasonality
78Feb
128Mar
17Apr
21May
0Jun
1Jul
0Aug
0Sep
0Oct
1Nov
12Dec
42
Recorded events
The 182 events kept for this page are the 120 most recent plus the 80 with the most damage, deaths or injuries out of 300. Magnitude is hail size, tornado rating or wind speed as recorded.
| Date | Event type | Magnitude | Property damage | Crop damage | Deaths | Injuries | Geography |
|---|---|---|---|---|---|---|---|
| 5 Jan 2026 | Flood | — | — | — | — | — | County |
| 5 Jan 2026 | Flood | — | — | — | — | — | County |
| 5 Jan 2026 | Flood | — | — | — | — | — | County |
| 5 Jan 2026 | Flood | — | — | — | — | — | County |
| 5 Jan 2026 | Flood | — | — | — | — | — | County |
| 5 Jan 2026 | Flood | — | — | — | — | — | County |
| 5 Jan 2026 | Flood | — | — | — | — | — | County |
| 5 Jan 2026 | Flood | — | — | — | — | — | County |
| 5 Jan 2026 | Flood | — | — | — | — | — | County |
| 5 Jan 2026 | Flood | — | — | — | — | — | County |
| 3 Jan 2026 | Flood | — | — | — | — | — | County |
| 3 Jan 2026 | Flood | — | — | — | — | — | County |
| 26 Dec 2025 | Flood | — | — | — | — | — | County |
| 21 Dec 2025 | Flood | — | — | — | — | — | County |
| 17 Nov 2025 | Flood | — | — | — | — | — | County |
| 13 Nov 2025 | Flood | — | — | — | — | — | County |
| 13 Feb 2025 | Flood | — | — | — | — | — | County |
| 13 Feb 2025 | Flood | — | — | — | — | — | County |
| 13 Feb 2025 | Flood | — | — | — | — | — | County |
| 6 Feb 2025 | Flood | — | — | — | — | — | County |
| 5 Feb 2025 | Flood | — | $10 | — | — | 2 | County |
| 5 Feb 2025 | Flood | — | — | — | 1 | — | County |
| 4 Feb 2025 | Flood | — | — | — | — | — | County |
| 4 Feb 2025 | Flood | — | — | — | 1 | — | County |
| 4 Feb 2025 | Flood | — | $10 | — | — | — | County |
| 4 Feb 2025 | Flood | — | $10 | — | — | — | County |
| 29 Dec 2024 | Flood | — | — | — | — | — | County |
| 29 Dec 2024 | Flood | — | — | — | — | — | County |
| 29 Dec 2024 | Flood | — | — | — | — | — | County |
| 27 Dec 2024 | Flood | — | — | — | — | — | County |
| 27 Dec 2024 | Flood | — | — | — | — | — | County |
| 27 Dec 2024 | Flood | — | — | — | — | — | County |
| 26 Dec 2024 | Flood | — | — | — | — | — | County |
| 14 Dec 2024 | Flood | — | — | — | — | — | County |
| 23 Nov 2024 | Flood | — | — | — | 1 | — | County |
| 21 Nov 2024 | Flood | — | $10 | — | — | — | County |
| 21 Nov 2024 | Flood | — | $10 | — | — | — | County |
| 20 Nov 2024 | Flood | — | $10 | — | — | — | County |
| 19 Feb 2024 | Flood | — | — | — | — | — | County |
| 19 Feb 2024 | Flood | — | — | — | — | — | County |
| 18 Feb 2024 | Flood | — | — | — | — | — | County |
| 18 Feb 2024 | Flood | — | — | — | — | — | County |
| 18 Feb 2024 | Flood | — | — | — | — | — | County |
| 18 Feb 2024 | Flood | — | — | — | — | — | County |
| 18 Feb 2024 | Flood | — | — | — | — | — | County |
| 17 Feb 2024 | Flood | — | — | — | — | — | County |
| 17 Feb 2024 | Flood | — | — | — | — | — | County |
| 17 Feb 2024 | Flood | — | — | — | — | — | County |
| 17 Feb 2024 | Flood | — | — | — | — | — | County |
| 4 Feb 2024 | Flood | — | $10 | — | — | — | County |
| 31 Jan 2024 | Flood | — | — | — | — | — | County |
| 22 Jan 2024 | Flood | — | $10 | — | — | — | County |
| 22 Jan 2024 | Flood | — | $10 | — | — | — | County |
| 22 Jan 2024 | Flood | — | $10 | — | — | — | County |
| 22 Jan 2024 | Flood | — | $10 | — | — | — | County |
| 22 Jan 2024 | Flood | — | $10 | — | — | — | County |
| 21 Jan 2024 | Flood | — | $10 | — | — | — | County |
| 21 Jan 2024 | Flood | — | $10 | — | — | — | County |
| 9 Jan 2023 | Flood | — | — | — | 1 | — | County |
| 13 Dec 2021 | Flood | — | — | — | — | — | County |
| 13 Dec 2021 | Flood | — | — | — | — | — | County |
| 8 Nov 2021 | Flood | — | — | — | — | — | County |
| 26 Jan 2021 | Flood | — | — | — | — | — | County |
| 16 Jan 2020 | Flood | — | — | — | — | — | County |
| 16 Jan 2020 | Flood | — | — | — | — | — | County |
| 7 Dec 2019 | Flood | — | — | — | — | — | County |
| 30 Nov 2019 | Flood | — | — | — | — | — | County |
| 6 Mar 2019 | Flood | — | — | — | — | — | County |
| 5 Mar 2019 | Flood | — | — | — | — | — | County |
| 27 Feb 2019 | Flood | — | — | — | — | — | County |
| 27 Feb 2019 | Flood | — | — | — | — | — | County |
| 27 Feb 2019 | Flood | — | — | — | — | — | County |
| 27 Feb 2019 | Flood | — | — | — | — | — | County |
| 27 Feb 2019 | Flood | — | — | — | — | — | County |
| 27 Feb 2019 | Flood | — | — | — | — | — | County |
| 27 Feb 2019 | Flood | — | — | — | — | — | County |
| 27 Feb 2019 | Flood | — | — | — | — | — | County |
| 27 Feb 2019 | Flood | — | — | — | — | — | County |
| 27 Feb 2019 | Flood | — | — | — | — | — | County |
| 26 Feb 2019 | Flood | — | — | — | — | — | County |
| 26 Feb 2019 | Flood | — | — | — | — | — | County |
| 26 Feb 2019 | Flood | — | — | — | — | — | County |
| 26 Feb 2019 | Flood | — | — | — | — | — | County |
| 26 Feb 2019 | Flood | — | — | — | — | — | County |
| 26 Feb 2019 | Flood | — | — | — | — | — | County |
| 26 Feb 2019 | Flood | — | — | — | — | — | County |
| 26 Feb 2019 | Flood | — | — | — | — | — | County |
| 26 Feb 2019 | Flood | — | — | — | — | — | County |
| 26 Feb 2019 | Flood | — | — | — | — | — | County |
| 26 Feb 2019 | Flood | — | — | — | — | — | County |
| 26 Feb 2019 | Flood | — | — | — | — | — | County |
| 26 Feb 2019 | Flood | — | — | — | — | — | County |
| 26 Feb 2019 | Flood | — | — | — | — | — | County |
| 26 Feb 2019 | Flood | — | — | — | — | — | County |
| 26 Feb 2019 | Flood | — | — | — | — | — | County |
| 26 Feb 2019 | Flood | — | — | — | — | — | County |
| 26 Feb 2019 | Flood | — | — | — | — | — | County |
| 26 Feb 2019 | Flood | — | — | — | — | — | County |
| 26 Feb 2019 | Flood | — | — | — | — | — | County |
| 26 Feb 2019 | Flood | — | — | — | — | — | County |
| 26 Feb 2019 | Flood | — | — | — | — | — | County |
| 26 Feb 2019 | Flood | — | — | — | — | — | County |
| 26 Feb 2019 | Flood | — | — | — | — | — | County |
| 26 Feb 2019 | Flood | — | — | — | — | — | County |
| 26 Feb 2019 | Flood | — | — | — | — | — | County |
| 26 Feb 2019 | Flood | — | — | — | — | — | County |
| 26 Feb 2019 | Flood | — | — | — | — | — | County |
| 26 Feb 2019 | Flood | — | — | — | — | — | County |
| 26 Feb 2019 | Flood | — | — | — | — | — | County |
| 26 Feb 2019 | Flood | — | — | — | — | — | County |
| 26 Feb 2019 | Flood | — | — | — | — | — | County |
| 26 Feb 2019 | Flood | — | — | — | — | — | County |
| 26 Feb 2019 | Flood | — | — | — | — | — | County |
| 26 Feb 2019 | Flood | — | — | — | — | — | County |
| 25 Feb 2019 | Flood | — | — | — | — | — | County |
| 15 Feb 2019 | Flood | — | — | — | — | — | County |
| 14 Feb 2019 | Flood | — | — | — | — | — | County |
| 14 Feb 2019 | Flood | — | — | — | — | — | County |
| 14 Feb 2019 | Flood | — | — | — | — | — | County |
| 14 Feb 2019 | Flood | — | — | — | — | — | County |
| 7 Jan 2019 | Flood | — | — | — | 1 | — | County |
| 4 Jan 2017 | Flash Flood | — | $5K | $5K | — | — | County |
| 6 Feb 2015 | Flood | — | — | — | — | — | County |
| 11 Dec 2014 | Flash Flood | — | $5K | — | — | — | County |
| 11 Dec 2014 | Flood | — | $5K | — | — | — | County |
| 11 Dec 2014 | Flood | — | $1K | — | — | — | County |
| 11 Dec 2014 | Flood | — | $1K | — | — | — | County |
| 11 Dec 2014 | Flood | — | — | — | — | — | County |
| 11 Dec 2014 | Flood | — | — | — | — | — | County |
| 11 Dec 2014 | Flood | — | — | — | — | — | County |
| 11 Dec 2014 | Flood | — | — | — | — | — | County |
| 11 Dec 2014 | Flood | — | — | — | — | — | County |
| 3 Dec 2014 | Flood | — | — | — | — | — | County |
| 3 Dec 2014 | Flood | — | — | — | — | — | County |
| 28 Feb 2014 | Flood | — | — | — | — | — | County |
| 28 Feb 2014 | Flood | — | — | — | — | — | County |
| 9 Feb 2014 | Flood | — | — | — | — | — | County |
| 9 Feb 2014 | Flood | — | — | — | — | — | County |
| 8 Feb 2014 | Flash Flood | — | $5K | — | — | — | County |
| 23 Dec 2012 | Flood | — | $40K | — | — | — | County |
| 23 Dec 2012 | Flood | — | $5K | — | — | — | County |
| 23 Dec 2012 | Flash Flood | — | $1K | — | — | — | County |
| 23 Dec 2012 | Flood | — | $1K | — | — | — | County |
| 23 Dec 2012 | Flash Flood | — | $500 | — | — | — | County |
| 23 Dec 2012 | Flash Flood | — | $500 | — | — | — | County |
| 2 Dec 2012 | Flash Flood | — | $500 | — | — | — | County |
| 2 Dec 2012 | Flash Flood | — | $500 | — | — | — | County |
| 2 Dec 2012 | Flood | — | $100 | — | — | — | County |
| 2 Dec 2012 | Flood | — | $100 | — | — | — | County |
| 2 Dec 2012 | Flood | — | $100 | — | — | — | County |
| 2 Dec 2012 | Flood | — | $100 | — | — | — | County |
| 30 Nov 2012 | Flash Flood | — | — | — | — | — | County |
| 30 Nov 2012 | Flash Flood | — | — | — | — | — | County |
| 24 Mar 2011 | Flood | — | — | — | — | — | County |
| 24 Mar 2011 | Flood | — | — | — | — | — | County |
| 24 Mar 2011 | Flood | — | — | — | — | — | County |
| 24 Mar 2011 | Flood | — | — | — | — | — | County |
| 19 Mar 2011 | Flood | — | — | — | — | — | County |
| 2 Mar 2011 | Flood | — | — | — | — | — | County |
| 17 Feb 2011 | Flood | — | $10K | — | — | — | County |
| 26 Jan 2010 | Flood | — | $4K | — | — | — | County |
| 20 Jan 2010 | Flood | — | $10K | — | — | — | County |
| 19 Jan 2010 | Flood | — | — | — | — | — | County |
| 13 Oct 2009 | Flood | — | $20K | $150K | — | — | County |
| 25 Jan 2008 | Flash Flood | — | $800K | — | — | — | County |
| 6 Mar 2006 | Flash Flood | — | — | — | — | — | County |
| 1 Jan 2006 | Flood | — | $104M | $3.0M | — | — | County |
| 31 Dec 2005 | Flood | — | $104M | $3.0M | — | — | County |
| 13 Feb 2000 | Flash Flood | — | — | — | — | — | County |
| 7 Feb 1998 | Flash Flood | — | — | — | — | — | County |
| 6 Feb 1998 | Flash Flood | — | — | — | — | — | County |
| 5 Feb 1998 | Flash Flood | — | — | — | — | — | County |
| 3 Feb 1998 | Flash Flood | — | $200K | $159K | — | 1 | County |
| 3 Feb 1998 | Flash Flood | — | $5.0M | — | — | — | County |
| 2 Feb 1998 | Flash Flood | — | $2.0M | — | — | — | County |
| 25 Jan 1997 | Flash Flood | — | — | — | — | — | County |
| 22 Jan 1997 | Flash Flood | — | — | — | — | — | County |
| 22 Jan 1997 | Flash Flood | — | — | — | — | — | County |
| 1 Jan 1997 | Flash Flood | — | — | — | — | — | County |
| 1 Jan 1997 | Flash Flood | — | — | — | — | — | County |
| 31 Dec 1996 | Flash Flood | — | — | — | 1 | — | County |
| 4 Feb 1996 | Flash Flood | — | — | — | — | — | County |
Questions and answers
How many flood events has Sonoma County had?
300 events in the NCEI Storm Events record between 1950 and 2026. Reporting of floods and flash floods became far more complete after 1996, so early decades undercount.
When was the last recorded flood event in Sonoma County?
5 Jan 2026 (Flood). Records reach NCEI about 120 days after the month ends.
What was the most damaging flood event recorded in Sonoma County?
The flood of 31 Dec 2005, with property damage estimated by NCEI at $104M and crop damage at $3.0M.
How does Sonoma County compare with California for flood?
19.0 events per 100 square miles against 4.6 statewide; the county holds 300 of the state's 7,136 recorded events.
Provenance
NOAA NCEI Storm Events Database, yearly details files through 30 Jun 2026, public domain. County-recorded events plus zone-recorded events whose forecast zone is named for the county (marked "Forecast zone"). Population and area from the US Census Bureau (2021). Built 1 Oct 2026. See the methodology, the Flood hub and the county page.