Yolo County, California: Natural Disaster Risk and History
Yolo County, California has a Relatively Moderate natural-hazard risk rating in FEMA's National Risk Index (v1.20, December 2025): a score of 91.4 out of 100, higher than about 91% of US counties, with drought, earthquakes and inland (river and flash) flooding scoring highest of its 18 hazards and $116 million a year in expected losses.
OpenFEMA lists 20 federal disaster declarations that included Yolo County since 1964, not counting 2 for COVID-19; the latest is DR-4683-CA (Severe Winter Storms, Flooding, Landslides, and Mudslides, declared 14 January 2023). NOAA's Storm Prediction Center recorded 4 tornadoes touching Yolo County from 1950 to 2025.
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Population 216,393 Buildings worth $48 billion Area 1,034 sq mi Risk rank in California 38 of 58 FIPS 06113
All 18 hazards, highest risk first
FEMA National Risk Index| Hazard | Risk rating | Score | Expected loss a year | How often | Events in record |
|---|---|---|---|---|---|
| Drought | Very High | 99.6 | $29 million | about 75 a year | 2,114 |
| Earthquake | Relatively Moderate | 97.4 | $42 million | about once every 15 years | — |
| Inland flooding | Relatively Moderate | 89.6 | $42 million | about once every 1.1 years | 26 |
| Wildfire | Relatively Low | 87.0 | $988,247 | about once every 219 years | — |
| Landslide | Relatively Low | 86.2 | $39,850 | about 11 a year | — |
| Heat wave | Relatively Low | 78.6 | $1.6 million | about 7.2 a year | 85 |
| Volcanic activity | Very Low | 62.2 | $51 | rarer than once in 1,000 years | 1 |
| Lightning | Relatively Low | 44.3 | $215,740 | about 5.8 a year | 20,665 strikes |
| Tornado | Very Low | 22.4 | $330,620 | about once every 7.5 years | 5 |
| Hail | Very Low | 11.3 | $41,080 | about once every 17 years | 2.2 |
| Strong wind | Very Low | 8.6 | $69,755 | about once every 40 years | 1 |
| Avalanche | Very Low | 7.5 | $5 | about once every 100 years | 0 |
| Winter weather | Very Low | 1.8 | $734 | about once every 14 years | 1.4 |
| Cold wave | No Rating | 0.0 | — | — | 0 |
| Coastal flooding | Not Applicable | — | — | — | — |
| Hurricane | Not Applicable | — | — | — | — |
| Ice storm | Not Applicable | — | — | — | — |
| Tsunami | Not Applicable | — | — | — | — |
Score: FEMA's percentile among US counties that face the hazard (higher = more risk). Expected loss: FEMA's modelled average yearly loss to buildings, people (as a statistical value) and crops. How often: FEMA's annualised frequency of the hazard in the county; for some hazards it counts event-days, so it is a rough guide, not a forecast. "Not Applicable" means FEMA does not model that hazard here.
Federal disaster declarations 20
Most common: Severe Storm 7, Flood 6, Fire 3, Hurricane 1.
| Decade | Declarations | Incident types |
|---|---|---|
| 1960s | 1 | Flood |
| 1970s | 1 | Drought |
| 1980s | 2 | Flood, Coastal Storm |
| 1990s | 5 | Severe Storm ×4, Freezing |
| 2000s | 2 | Severe Storm, Hurricane |
| 2010s | 5 | Severe Storm ×2, Flood ×2, Fire |
| 2020s | 4 | Flood ×2, Fire ×2 |
The last 10
Widest declarations that included Yolo County
- Hurricane Katrina Evacuation (2005, EM-3248-CA): 58 California counties designated.
- Severe Winter Storms, Flooding Landslides, Mud Flow (1995, DR-1046-CA): 57 California counties designated.
- Severe Storms, Flooding, Mud and Landslides (1997, DR-1155-CA): 48 California counties designated.
Named storms in its declarations: Hurricane Katrina (2005).
Not counted above: 2 COVID-19 ("Biological") declarations — in 2020 every US county was included. California also had 30 statewide declarations with no county list.
Tornado record since 1950 4
| Tornadoes touching the county | 4 |
|---|---|
| Strongest-rated | (E)F0 ×4 |
| Peak month | February (2) |
| Deadliest | — |
| Longest path | 28 Sep 2019, EF0, 1.7 mi path |
| Most recent | 28 Sep 2019, EF0, 1.7 mi path |
| Deaths / injuries on those paths | 0 / 0 |
| Rating | (E)F0 | (E)F1 | (E)F2 | (E)F3 | (E)F4 | (E)F5 | Unrated |
|---|---|---|---|---|---|---|---|
| Count | 4 | 0 | 0 | 0 | 0 | 0 | 0 |
| Decade | 1950s | 1960s | 1970s | 1980s | 1990s | 2000s | 2010s | 2020s |
|---|---|---|---|---|---|---|---|---|
| Count | 0 | 0 | 0 | 0 | 0 | 2 | 2 | 0 |
Deaths and injuries are for each tornado's whole path, which can run beyond this county. F-scale ratings before February 2007, Enhanced Fujita (EF) after.
How Yolo County compares with its 5 nearest counties
| County | Distance | Overall risk | Score | Top hazard |
|---|---|---|---|---|
| Yolo County (this page) | — | Relatively Moderate | 91.4 | Drought |
| Napa County | 42 km | Relatively High | 95.3 | Drought |
| Sutter County | 43 km | Relatively Moderate | 83.7 | Drought |
| Solano County | 46 km | Relatively High | 97.0 | Drought |
| Sacramento County | 55 km | Relatively High | 98.1 | Drought |
| Colusa County | 62 km | Relatively Moderate | 81.1 | Drought |
Nearest by distance between county centres. Every county in California, ranked.
Vulnerability and resilience
| Social vulnerability | Relatively Low 24.2 |
|---|---|
| Community resilience | Relatively High 69.4 |
| Community risk factor | 0.92 |
| Expected annual loss, all hazards | $116 million |
FEMA scales expected losses up where social vulnerability is high (people who may find it harder to prepare, evacuate or recover) and down where community resilience is high. A factor above 1 raises the risk score. For social vulnerability a high rating is worse; for resilience a high rating is better.
Prepare for Yolo County's main hazards
- Right now: National Weather Service alerts for California · all official warnings on Global Incident Tracker.
- Drought: Drought monitor for California
- Earthquake: Earthquakes today · Earthquake safety guide
- Inland flooding: Flood safety: why shallow water kills · Floods recorded
- Your property's flood zone: FEMA Flood Map Service Center ↗ — this page cannot tell you that.
- Official preparedness guidance: Ready.gov ↗ and your county emergency management office.
What this page shows, and what it misses
FEMA's National Risk Index rates a whole county against every other US county; it is a planning-level estimate for nationwide comparison, not a flood-zone map and not a substitute for a local risk assessment or the risk to one home. Declarations are presidential disaster, emergency and fire management declarations that named this county; state declarations and SBA or USDA designations are not included. Tornadoes are counted when the county is one of up to four listed on the track; 670 tornadoes that crossed a state line carry no county list in NOAA's file and are left out.
Federal Emergency Management Agency (FEMA), National Risk Index Dataset: National Risk Index Counties - v1.20.0 (December 2025). Retrieved from https://services.arcgis.com/XG15cJAlne2vxtgt/ArcGIS/rest/services/National_Risk_Index_Counties/FeatureServer/0/query on November 2, 2026, 1:20 PM EST. This product uses the Federal Emergency Management Agency’s National Risk Index dataset API or downloadable datasets but is not endorsed by FEMA. The Federal Government or FEMA cannot vouch for the data or analyses derived from these data after the data have been retrieved from the Agency's website(s).
Federal Emergency Management Agency (FEMA), OpenFEMA Dataset: Disaster Declarations Summaries - v2, retrieved from https://www.fema.gov/api/open/v2/DisasterDeclarationsSummaries on November 2, 2026, 1:21 PM EST. This product uses the Federal Emergency Management Agency's OpenFEMA API, but is not endorsed by FEMA. The Federal Government or FEMA cannot vouch for the data or analyses derived from these data after the data have been retrieved from the Agency's website(s).
Tornado records: NOAA/NWS Storm Prediction Center, Severe Weather Database, tornadoes 1950–2025 (https://www.spc.noaa.gov/wcm/data/1950-2025_actual_tornadoes.csv, downloaded 2 November 2026). Public domain; not endorsed by NOAA. Compiled by Global Incident Tracker.
Questions about Yolo County
What natural disasters is Yolo County, California most at risk from?
Yolo County, California has a Relatively Moderate natural-hazard risk rating in FEMA's National Risk Index (v1.20, December 2025): a score of 91.4 out of 100, higher than about 91% of US counties, with drought, earthquakes and inland (river and flash) flooding scoring highest of its 18 hazards and $116 million a year in expected losses.
How many federal disaster declarations has Yolo County had?
OpenFEMA lists 20 federal disaster declarations that included Yolo County since 1964, not counting 2 for COVID-19; the latest is DR-4683-CA (Severe Winter Storms, Flooding, Landslides, and Mudslides, declared 14 January 2023). Another 30 California declarations were made statewide without a county list.
How many tornadoes have hit Yolo County?
NOAA's Storm Prediction Center recorded 4 tornadoes touching Yolo County from 1950 to 2025.
Is the National Risk Index a flood zone map?
No. The National Risk Index is a planning-level estimate for a whole county, built for nationwide comparison. It does not tell you the flood zone or the risk of a single property: for that, look up the address on FEMA's Flood Map Service Center (msc.fema.gov) and ask your local floodplain manager.