Canyon County, ID
FEMA National Risk Index scores, disaster declarations & hazard data
Canyon County has experienced 4 federally declared disasters since 2005, most recently Covid-19 in 2020. Its overall natural hazard risk is rated Relatively Low — lower risk than most US counties.
Canyon County's highest-rated hazards are winter weather, wildfire, and heat wave, with its top risk rated "Very High" by FEMA's National Risk Index.
Past disasters & FEMA designations
A federal disaster declaration officially designates a county for FEMA disaster assistance. Canyon County has been designated in 4 declarations since 2005, covering 3 disaster types including biological (2), flood (1), hurricane (1).
| Year | Type | Event name |
|---|---|---|
| 2020 | Biological | Covid-19 Pandemic |
| 2020 | Biological | Covid-19 |
| 2018 | Flood | Flooding |
| 2005 | Hurricane | Hurricane Katrina |
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 Moderate | 92.5 | 0 | 0 | — |
| Inland Flooding | Relatively Moderate | 80.3 | 6 | 0 | $1.5M |
| Coastal Flooding | Not Applicable | — | 0 | 0 | — |
| Earthquake | Relatively Low | 78.8 | — | — | — |
| Heat Wave | Relatively Moderate | 89.5 | 1 | 1 | — |
| Tornado | Very Low | 20.8 | 0 | 0 | — |
| Hurricane | Not Applicable | — | 0 | 0 | — |
| Hail | Relatively Low | 46.7 | 4 | 0 | — |
| Strong Wind | Relatively Moderate | 68.4 | 0 | 0 | — |
| Winter Weather | Very High | 97 | 0 | 0 | — |
| Ice Storm | Relatively Moderate | 73.8 | — | — | — |
| Cold Wave | Relatively Low | 26 | — | — | — |
| Lightning | Relatively High | 84.9 | 0 | 0 | — |
| Drought | Very Low | 20.9 | 0 | 0 | — |
| Landslide | Very Low | 31.7 | 0 | 0 | — |
| Avalanche | Very Low | 5.6 | — | — | — |
| Tsunami | Not Applicable | — | — | — | — |
| Volcanic Activity | Very Low | 68.7 | — | — | — |
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
Canyon County ranks in the 62nd 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 | 62nd | Moderate |
| Socioeconomic status | 56th | Moderate |
| Household characteristics | 73rd | Moderate |
| Racial & ethnic minority status | 69th | Moderate |
| Housing type & transportation | 46th | Low |
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 | 83rd | Very High |
| Risk to homes | 81st | Very High |
| Buildings in direct exposure zone | 44.8% | — |
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 Canyon County?
According to the FEMA National Risk Index, the highest-risk hazards in Canyon County, Idaho are winter weather, wildfire, and heat wave. The county's overall natural hazard risk is rated Relatively Low — lower risk than most US counties.
Has Canyon County received federal disaster declarations?
Yes. Canyon County has received 4 federal disaster declarations since 2005, including declarations in 2020. The most common disaster type on record is biological (2 declarations).
Has Canyon County had any FEMA disaster declarations in 2024, 2025, or 2026?
No federal disaster declarations have been recorded for Canyon County since the start of 2024. Its most recent declaration on record is Covid-19 in 2020.
How does Canyon County's natural hazard risk compare to nearby counties?
Among neighboring counties, Ada County, ID has the highest overall natural hazard risk (Relatively Moderate) and Payette County, ID has the lowest (Very Low). Canyon County is rated Relatively Low overall.
How is Canyon County's composite disaster risk index calculated?
Canyon 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. Canyon County's composite score of 72 means its overall natural hazard risk is higher than 72% of US counties.