Idaho Risk Spotlight: the highest- and lowest-risk counties (August 2026)
Published 2026-08-31
Every county in Idaho carries a different mix of natural-hazard, road-safety and crime risk. RiskIndex scores all of them on a single 0–100 composite scale (higher = riskier) built entirely from official U.S. government data — FEMA, NHTSA and the FBI. Here's how Idaho's counties stack up this month.
The 5 highest-risk counties in Idaho
| # | County | Composite | Grade |
|---|---|---|---|
| 1 | Idaho County | 78.2 | D |
| 2 | Boise County | 71.5 | D |
| 3 | Valley County | 67.2 | D |
| 4 | Bonneville County | 65.3 | D |
| 5 | Shoshone County | 62 | D |
Across these five, the biggest risk driver is road safety — fatal-crash exposure on the region's roads. Click any county for its full hazard, crash, crime and area profile.
The 5 lowest-risk counties in Idaho
| # | County | Composite | Grade |
|---|---|---|---|
| 1 | Lewis County | 21.2 | B |
| 2 | Franklin County | 21.7 | B |
| 3 | Oneida County | 25.6 | B |
| 4 | Caribou County | 25.8 | B |
| 5 | Latah County | 27 | B |
How these scores are built
The composite blends three government datasets: natural hazard (FEMA National Risk Index, 45%), road safety (NHTSA fatal-crash records, 30%) and crime (FBI Crime Data Explorer, 25%). Each is expressed as a percentile against all U.S. counties, so a score of 80 means an area is riskier than 80% of the country. Full methodology and refresh dates are on our Data Sources page.
Want this data programmatically? The RiskIndex API returns these scores — plus ZIP-level detail and 14 area indicators — as clean JSON. Get a free API key (100 calls/month, no card required), or go commercial from $9/mo.
Scores are statistical percentiles for comparing areas, not predictions, and not a consumer report under the FCRA. See our Terms.