FEMA NRI 1.19.0Updated Nov 2023 · Coverage 2014–2023Methodology

Idaho Disaster Risk

Natural disaster risk data for all 44 counties.

Avg FEMA Rating

Very Low

Avg Percentile

39th

Counties with Data

of 44 total

County risk atlas

Idaho hazard exposure by county

A compact 2.5D surface of FEMA National Risk Index percentiles. Toggle composite, flood, wildfire, hurricane, tornado, and earthquake risk to see which counties carry the highest relative exposure without loading the full national explorer dataset.

Counties

44/44

Avg composite

39th

Risk layers

Highest Risk Counties

Ada County

Relatively Moderate

88th percentile

Bonneville County

Relatively Moderate

82th percentile

Kootenai County

Relatively Low

79th percentile

Idaho County

Relatively Low

78th percentile

Bonner County

Relatively Low

77th percentile

Lowest Risk Counties

Clark County

Very Low

1th percentile

Oneida County

Very Low

1th percentile

Lewis County

Very Low

3th percentile

Butte County

Very Low

4th percentile

Camas County

Very Low

6th percentile

All Idaho Counties

County	Percentile	FEMA Rating	Flood	Wildfire	Tornado	Earthquake
Ada County	88th	Relatively Moderate	89.8	98.3	27.0	88.2
Bonneville County	82th	Relatively Moderate	78.6	90.3	16.2	94.2
Kootenai County	79th	Relatively Low	86.3	79.5	22.0	79.2
Idaho County	78th	Relatively Low	72.9	98.7	6.1	40.1
Bonner County	77th	Relatively Low	87.0	82.7	10.3	55.8
Canyon County	72th	Relatively Low	80.3	92.5	20.8	78.8
Bannock County	67th	Relatively Low	51.9	96.9	15.1	82.8
Blaine County	65th	Relatively Low	70.5	93.8	7.7	73.7
Shoshone County	63th	Relatively Low	76.0	69.6	4.0	38.4
Bingham County	60th	Relatively Low	58.8	83.6	8.2	88.3
Madison County	59th	Relatively Low	57.8	70.3	9.9	87.6
Valley County	56th	Relatively Low	55.8	97.5	3.6	66.2
Custer County	52th	Relatively Low	57.3	87.0	3.0	79.3
Elmore County	52th	Relatively Low	30.1	97.6	7.1	42.0
Boise County	49th	Relatively Low	42.9	97.2	4.0	40.0
Twin Falls County	47th	Relatively Low	51.1	94.0	13.4	74.0
Clearwater County	47th	Relatively Low	55.7	96.4	3.4	23.0
Owyhee County	44th	Relatively Low	58.7	95.8	6.2	34.5
Cassia County	44th	Relatively Low	52.7	94.7	9.8	74.5
Lemhi County	41th	Very Low	59.8	93.2	3.1	53.5
Jefferson County	40th	Very Low	37.1	62.5	7.0	80.6
Adams County	40th	Very Low	35.9	96.7	2.9	37.4
Fremont County	38th	Very Low	41.4	87.1	6.8	82.9
Gem County	34th	Very Low	35.7	96.5	5.9	51.0
Latah County	33th	Very Low	50.4	92.1	9.4	43.6
Nez Perce County	33th	Very Low	57.7	89.3	7.5	38.3
Washington County	30th	Very Low	38.2	95.6	5.5	53.8
Teton County	29th	Very Low	28.0	90.9	10.6	78.3
Boundary County	26th	Very Low	45.8	80.7	3.5	25.4
Gooding County	25th	Very Low	25.9	95.3	9.6	58.5
Jerome County	21th	Very Low	31.1	90.2	9.0	58.7
Minidoka County	20th	Very Low	32.1	55.3	8.3	74.3
Benewah County	20th	Very Low	46.9	74.8	5.1	26.4
Payette County	17th	Very Low	33.9	90.0	6.7	55.9
Power County	17th	Very Low	7.6	89.0	5.3	58.2
Lincoln County	9th	Very Low	14.4	92.0	3.9	32.2
Franklin County	8th	Very Low	17.4	78.8	3.2	70.5
Caribou County	7th	Very Low	10.7	81.0	3.1	72.1
Bear Lake County	7th	Very Low	7.2	78.4	2.0	68.9
Camas County	6th	Very Low	3.4	80.8	1.7	23.2
Butte County	4th	Very Low	9.1	55.5	3.0	45.9
Lewis County	3th	Very Low	12.0	85.9	2.8	23.4
Oneida County	1th	Very Low	4.9	81.2	2.6	39.8
Clark County	1th	Very Low	2.1	64.7	1.5	30.9

Frequently Asked Questions

Which county in Idaho has the highest natural disaster risk?

Ada County has the highest natural disaster risk in Idaho, rated Relatively Moderate (88th percentile nationally), based on FEMA National Risk Index data.

Which county in Idaho is the safest from natural disasters?

Clark County has the lowest natural disaster risk in Idaho, rated Very Low (1th percentile nationally), based on FEMA NRI data.

What natural disasters are most common in Idaho?

Idaho counties face varying levels of risk from floods, wildfires, tornadoes, earthquakes, and hurricanes. The FEMA National Risk Index scores each county across 18 hazard types. See individual county pages for detailed hazard breakdowns.

How is natural disaster risk measured by county?

The FEMA National Risk Index (NRI) measures natural disaster risk using expected annual loss, social vulnerability, and community resilience. Scores are normalized nationally, with ratings from Very Low to Very High across 18 natural hazard types.

Prepare your household for natural disasters

FEMA's Ready.gov provides county-specific preparedness checklists and emergency planning guides.

FEMA Ready Guide →

Data Source

Risk data sourced from the FEMA National Risk Index (NRI). Risk scores are relative rankings (0–100) across all US counties — not absolute risk measures. Higher scores indicate higher relative risk compared to other counties.

Disclaimer: This data is informational only. It is not financial, insurance, or legal advice. Always consult a qualified professional before making insurance or real estate decisions.

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