Yolo County, CA
FEMA National Risk Index scores, disaster declarations & hazard data
Yolo County has experienced 22 federally declared disasters since 1965, most recently Severe Winter Storms, Flooding, And Mudslides in 2023. Its overall natural hazard risk is rated Relatively Moderate — near the middle compared to other US counties.
Yolo County's highest-rated hazards are drought, earthquake, and inland flooding, with its top risk rated "Very High" by FEMA's National Risk Index. Recorded storm events have increased 76% over the past five years compared to the prior five-year period. Community vulnerability is elevated (74th percentile nationally), suggesting residents may face greater difficulty recovering from major disasters.
Past disasters & FEMA designations
A federal disaster declaration officially designates a county for FEMA disaster assistance. Yolo County has been designated in 22 declarations since 1965, covering 8 disaster types including severe storm (7), flood (6), fire (3).
| Year | Type | Event name |
|---|---|---|
| 2023 | Flood | Severe Winter Storms, Flooding, Landslides, And Mudslides |
| 2023 | Flood | Severe Winter Storms, Flooding, And Mudslides |
| 2020 | Fire | Wildfires |
| 2020 | Fire | Lnu Lightning Fire Complex |
| 2020 | Biological | Covid-19 Pandemic |
| 2020 | Biological | Covid-19 |
| 2019 | Severe Storm | Severe Winter Storms, Flooding, Landslides, And Mudslides |
| 2017 | Flood | Severe Winter Storms, Flooding, And Mudslides |
| 2017 | Flood | Severe Winter Storms, Flooding, And Mudslides |
| 2017 | Severe Storm | Severe Winter Storms, Flooding, And Mudslides |
Showing the 10 most recent of 22 total declarations since 1965.
Source: FEMA OpenFEMA Disaster Declarations Summaries. A single disaster can produce more than one record per county. Data current through September 2026.
Risk by hazard type
| Hazard | Risk rating | Risk score | Recorded events | Deaths | Prop. damage |
|---|---|---|---|---|---|
| Wildfire | Relatively Low | 87 | 0 | 0 | — |
| Inland Flooding | Relatively Moderate | 89.6 | 46 | 0 | $11.0M |
| Coastal Flooding | Not Applicable | — | 0 | 0 | — |
| Earthquake | Relatively Moderate | 97.4 | 3 | — | — |
| Heat Wave | Relatively Low | 78.6 | 0 | 0 | — |
| Tornado | Very Low | 22.4 | 1 | 0 | — |
| Hurricane | Not Applicable | — | 0 | 0 | — |
| Hail | Very Low | 11.3 | 2 | 0 | — |
| Strong Wind | Very Low | 8.6 | 0 | 0 | — |
| Winter Weather | Very Low | 1.8 | 0 | 0 | — |
| Ice Storm | Not Applicable | — | — | — | — |
| Cold Wave | No Rating | 0 | — | — | — |
| Lightning | Relatively Low | 44.3 | 0 | 0 | — |
| Drought | Very High | 99.6 | 0 | 0 | — |
| Landslide | Relatively Low | 86.2 | 2 | 0 | $757K |
| Avalanche | Very Low | 7.5 | — | — | — |
| Tsunami | Not Applicable | — | — | — | — |
| Volcanic Activity | Very Low | 62.2 | — | — | — |
Scores are 0–100 percentiles relative to all US counties — higher means more exposed, not that a disaster is likely this year. Event counts: NOAA Storm Events 2016–2026; earthquake counts from USGS ComCat (M3.0+, 1996–2026). See the methodology page for details.
Community vulnerability
Yolo County ranks in the 74th percentile (Moderate) for community vulnerability — a measure of how hard disaster impacts tend to hit residents. Higher vulnerability means more displacement, worse health outcomes, and slower recovery after a disaster.
| SVI theme | Percentile | Vulnerability level |
|---|---|---|
| Overall | 74th | Moderate |
| Socioeconomic status | 62nd | Moderate |
| Household characteristics | 16th | Very low |
| Racial & ethnic minority status | 90th | High |
| Housing type & transportation | 97th | High |
Source: CDC/ATSDR Social Vulnerability Index 2022. Percentiles compare counties nationally — higher means more vulnerable relative to other counties. See CDC SVI for full methodology.
Future risk outlook
| Wildfire metric | National percentile | Level |
|---|---|---|
| Burn probability | 91st | Very High |
| Risk to homes | 92nd | Very High |
| Buildings in direct exposure zone | 15.4% | — |
NOAA tracked 47 weather events in this county over 2016–2025: 17 in 2016–20 vs 30 in 2021–25 (+76% — frequency increasing).
Wildfire: USDA Forest Service Wildfire Risk to Communities (RDS-2020-0016-2) — modeled values, not annual forecasts. See wildfirerisk.org. Inland flood and heat projections pending data availability; coastal sea-level projections are available for select coastal counties below — see the data page.
Nearby counties
Frequently asked questions
What natural hazards pose the greatest risk in Yolo County?
According to the FEMA National Risk Index, the highest-risk hazards in Yolo County, California are drought, earthquake, and inland flooding. The county's overall natural hazard risk is rated Relatively Moderate — near the middle compared to other US counties.
Has Yolo County received federal disaster declarations?
Yes. Yolo County has received 22 federal disaster declarations since 1965, including declarations in 2023. The most common disaster type on record is severe storm (7 declarations).
Has Yolo County had any FEMA disaster declarations in 2024, 2025, or 2026?
No federal disaster declarations have been recorded for Yolo County since the start of 2024. Its most recent declaration on record is Severe Winter Storms, Flooding, And Mudslides in 2023.
How does Yolo County's natural hazard risk compare to nearby counties?
Among neighboring counties, Sacramento County, CA has the highest overall natural hazard risk (Relatively High) and Yuba County, CA has the lowest (Relatively Low). Yolo County is rated Relatively Moderate overall.
How is Yolo County's composite disaster risk index calculated?
Yolo County's composite disaster risk index — officially FEMA's National Risk Index (NRI) — scores every US county on a 0–100 percentile scale across 18 natural hazard types, factoring in expected annual loss, social vulnerability, and community resilience. Yolo County's composite score of 91 means its overall natural hazard risk is higher than 91% of US counties.