Valley County, Idaho: Natural Disaster Risk and History
Valley County, Idaho has a Relatively Low natural-hazard risk rating in FEMA's National Risk Index (v1.20, December 2025): a score of 55.6 out of 100, higher than about 55% of US counties, with wildfires, landslides and avalanches scoring highest of its 18 hazards and $20 million a year in expected losses.
OpenFEMA lists 10 federal disaster declarations that included Valley County since 1997, not counting 2 for COVID-19; the latest is FM-5449-ID (Four Corners Fire, declared 19 August 2022). NOAA's Storm Prediction Center has no tornado on record touching Valley County from 1950 to 2025.
Live weather alerts for Idaho All official warnings Latest FEMA declarations
Population 11,617 Buildings worth $5.6 billion Area 3,771 sq mi Risk rank in Idaho 12 of 44 FIPS 16085
All 18 hazards, highest risk first
FEMA National Risk Index| Hazard | Risk rating | Score | Expected loss a year | How often | Events in record |
|---|---|---|---|---|---|
| Wildfire | Relatively Moderate | 97.5 | $9.1 million | about once every 93 years | — |
| Landslide | Relatively Moderate | 96.4 | $214,118 | about 4.3 a year | — |
| Avalanche | Relatively Moderate | 84.2 | $913,336 | about once every 15 years | 2 |
| Earthquake | Relatively Low | 66.2 | $676,168 | about once every 100 years | — |
| Winter weather | Relatively Low | 59.1 | $92,337 | about 2 a year | 381 |
| Inland flooding | Relatively Low | 55.8 | $8.3 million | about once every 2.3 years | 12 |
| Lightning | Relatively Low | 27.0 | $102,268 | about 25 a year | 67,307 strikes |
| Volcanic activity | Very Low | 23.8 | $1 | rarer than once in 1,000 years | 2 |
| Heat wave | Very Low | 17.6 | $50,409 | about once a year | 13 |
| Drought | Very Low | 12.8 | $12 | about 24 a year | 658 |
| Ice storm | Very Low | 9.2 | $4,898 | about once every 67 years | 0 |
| Strong wind | Very Low | 7.0 | $51,823 | about once every 7.1 years | 6 |
| Cold wave | Very Low | 5.5 | $24,398 | about once every 19 years | 1 |
| Hail | Very Low | 5.2 | $13,653 | about once every 8.2 years | 4.7 |
| Tornado | Very Low | 3.6 | $10,768 | about once every 21 years | 0 |
| Coastal flooding | Not Applicable | — | — | — | — |
| Hurricane | 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 10
Most common: Fire 5, Flood 2, Severe Storm 2, Hurricane 1.
| Decade | Declarations | Incident types |
|---|---|---|
| 1990s | 1 | Severe Storm |
| 2000s | 4 | Fire ×3, Hurricane |
| 2010s | 4 | Flood ×2, Fire, Severe Storm |
| 2020s | 1 | Fire |
The last 10
Widest declarations that included Valley County
- Hurricane Katrina (2005, EM-3244-ID): 44 Idaho counties designated.
- Severe Storms, Flooding, Mud and Landslides (1997, DR-1154-ID): 18 Idaho counties designated.
- Wildfires (2000, DR-1341-ID): 15 Idaho 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. Idaho also had 8 statewide declarations with no county list.
Tornado record since 1950 0
No tornado in NOAA's Storm Prediction Center record touched Valley County between 1950 and 2025. That does not mean one cannot happen.
How Valley County compares with its 5 nearest counties
| County | Distance | Overall risk | Score | Top hazard |
|---|---|---|---|---|
| Valley County (this page) | — | Relatively Low | 55.6 | Wildfire |
| Adams County | 71 km | Very Low | 39.6 | Wildfire |
| Boise County | 88 km | Relatively Low | 48.9 | Landslide |
| Gem County | 103 km | Very Low | 34.4 | Wildfire |
| Washington County | 103 km | Very Low | 30.3 | Wildfire |
| Custer County | 117 km | Relatively Low | 52.4 | Landslide |
Nearest by distance between county centres. Every county in Idaho, ranked.
Vulnerability and resilience
| Social vulnerability | Relatively Low 32.0 |
|---|---|
| Community resilience | Relatively High 64.2 |
| Community risk factor | 0.99 |
| Expected annual loss, all hazards | $20 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 Valley County's main hazards
- Right now: National Weather Service alerts for Idaho · all official warnings on Global Incident Tracker.
- Wildfire: US wildfires now · Wildfire smoke: what protects you
- Landslide: Landslides recorded
- Avalanche: Official warnings now
- 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 Valley County
What natural disasters is Valley County, Idaho most at risk from?
Valley County, Idaho has a Relatively Low natural-hazard risk rating in FEMA's National Risk Index (v1.20, December 2025): a score of 55.6 out of 100, higher than about 55% of US counties, with wildfires, landslides and avalanches scoring highest of its 18 hazards and $20 million a year in expected losses.
How many federal disaster declarations has Valley County had?
OpenFEMA lists 10 federal disaster declarations that included Valley County since 1997, not counting 2 for COVID-19; the latest is FM-5449-ID (Four Corners Fire, declared 19 August 2022). Another 8 Idaho declarations were made statewide without a county list.
How many tornadoes have hit Valley County?
NOAA's Storm Prediction Center has no tornado on record touching Valley 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.