FEMA NRI v1.20Released December 2025Methodology

Montana Disaster Risk

Natural disaster risk data for all 56 counties.

FEMA release

December 2025

Mean county NRI score

33.3

Counties with Data

of 56 total

County risk atlas

Montana hazard exposure by county

FEMA NRI v1.20 scores on a 0–100 relative scale. Toggle the composite and five selected hazard categories out of FEMA's 18. Flood is the higher of Coastal Flooding and Inland Flooding NRI scores.

Counties

56/56

Mean county NRI score

33.3

Risk layers

Highest Risk Counties

Flathead County

Relatively Moderate

NRI score 86.5

Yellowstone County

Relatively Moderate

NRI score 83.6

Cascade County

Relatively Moderate

NRI score 83.1

Gallatin County

Relatively Moderate

NRI score 81.0

Ravalli County

Relatively Low

NRI score 78.5

Lowest Risk Counties

Treasure County

Very Low

NRI score 0.5

Golden Valley County

Very Low

NRI score 1.0

Petroleum County

Very Low

NRI score 1.3

Carter County

Very Low

NRI score 1.7

Daniels County

Very Low

NRI score 1.8

All Montana Counties

County	NRI score	FEMA Rating	Flood	Wildfire	Tornado	Earthquake
Flathead County	86.5	Relatively Moderate	79.8	95.5	4.6	95.8
Yellowstone County	83.6	Relatively Moderate	84.5	93.4	28.9	74.7
Cascade County	83.1	Relatively Moderate	83.4	84.2	20.8	71.8
Gallatin County	81.0	Relatively Moderate	64.2	91.4	16.7	94.1
Ravalli County	78.5	Relatively Low	52.0	98.9	9.1	69.3
Missoula County	77.0	Relatively Low	68.6	95.8	10.1	91.3
Lewis and Clark County	71.2	Relatively Low	64.6	92.8	8.9	86.8
Lake County	67.7	Relatively Low	57.2	92.7	3.3	92.3
Park County	66.3	Relatively Low	55.6	93.5	8.3	76.4
Lincoln County	64.3	Relatively Low	65.5	96.6	6.0	63.5
Dawson County	63.8	Relatively Low	28.1	59.6	25.1	15.0
Carbon County	59.8	Relatively Low	72.3	93.3	17.1	53.6
Big Horn County	57.2	Relatively Low	55.1	94.8	12.1	39.6
Roosevelt County	54.5	Relatively Low	26.6	72.8	32.1	15.8
Richland County	52.7	Relatively Low	25.1	55.0	27.0	8.4
Glacier County	51.5	Relatively Low	45.5	85.3	3.7	60.8
Hill County	50.4	Relatively Low	43.4	62.8	8.3	20.5
Rosebud County	49.7	Relatively Low	56.5	95.0	10.1	29.7
Sanders County	47.4	Relatively Low	61.9	91.2	4.7	67.9
Blaine County	45.9	Relatively Low	46.5	69.8	6.7	13.4
Fergus County	45.1	Relatively Low	36.5	80.4	15.7	25.9
Beaverhead County	42.9	Relatively Low	36.3	84.3	6.8	85.7
Custer County	42.1	Very Low	38.3	85.4	16.2	31.4
Madison County	41.0	Very Low	29.8	87.3	4.1	79.9
Chouteau County	39.5	Very Low	50.4	72.6	11.9	27.1
Silver Bow County	38.0	Very Low	21.7	80.7	9.8	87.4
Valley County	35.9	Very Low	34.2	49.5	14.6	23.0
Phillips County	34.5	Very Low	39.8	67.7	7.8	15.1
Pondera County	24.6	Very Low	29.3	70.3	4.5	51.3
Jefferson County	21.6	Very Low	29.4	89.1	5.7	64.8
Teton County	19.0	Very Low	32.2	73.5	5.0	53.7
Broadwater County	17.7	Very Low	19.1	72.9	5.1	74.9
Deer Lodge County	17.6	Very Low	10.5	73.6	5.5	50.0
Musselshell County	17.0	Very Low	15.5	91.9	8.1	20.7
Stillwater County	16.8	Very Low	36.2	87.1	6.6	33.7
Sheridan County	15.1	Very Low	13.3	51.2	16.1	6.5
Toole County	13.0	Very Low	17.8	47.9	3.8	29.9
Wibaux County	11.1	Very Low	3.7	41.9	8.7	2.0
Powell County	10.0	Very Low	15.8	86.4	2.2	59.5
Granite County	9.4	Very Low	11.1	88.6	2.7	37.7
Sweet Grass County	8.1	Very Low	19.7	88.1	3.8	34.9
Mineral County	7.3	Very Low	16.0	85.6	1.3	29.1
Liberty County	6.3	Very Low	11.9	17.1	3.5	15.4
Judith Basin County	5.5	Very Low	12.6	63.7	7.3	18.8
Fallon County	5.4	Very Low	5.5	56.5	10.5	7.8
McCone County	5.2	Very Low	5.6	48.6	10.8	10.0
Prairie County	4.2	Very Low	5.8	61.0	8.7	5.3
Powder River County	4.0	Very Low	7.8	88.0	7.3	18.0
Wheatland County	3.5	Very Low	12.2	51.0	5.8	24.3
Meagher County	2.8	Very Low	9.7	68.4	5.2	30.6
Garfield County	2.5	Very Low	5.4	78.3	4.2	6.4
Daniels County	1.8	Very Low	3.0	37.8	7.9	3.3
Carter County	1.7	Very Low	4.1	73.8	7.6	12.3
Petroleum County	1.3	Very Low	2.0	66.5	2.5	1.7
Golden Valley County	1.0	Very Low	5.6	57.4	3.8	11.4
Treasure County	0.5	Very Low	2.5	63.6	1.9	3.3

Frequently Asked Questions

How many Montana county records are included?

RiskByCounty includes 56 Montana county records from FEMA NRI v1.20 (December 2025).

Which FEMA county ratings appear in Montana?

FEMA NRI v1.20 (December 2025) county rating counts for Montana: Very Low: 34; Relatively Low: 18; Relatively Moderate: 4; Relatively High: 0; Very High: 0; Not available: 0.

How complete are the five selected hazard fields for Montana?

FEMA NRI v1.20 (December 2025) availability among 56 county records: Flood: 56 of 56; Wildfire: 56 of 56; Tornado: 56 of 56; Earthquake: 56 of 56; Hurricane: 0 of 56. RiskByCounty displays five selected hazard categories out of FEMA's 18.

Official Ready.gov resource

Continue to Ready.gov for federal emergency-planning information maintained outside RiskByCounty.

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Data Source

County data sourced from FEMA National Risk Index v1.20, released December 2025. Values are labeled NRI score (0–100 relative scale). RiskByCounty displays five selected hazard categories out of FEMA's 18; flood is the higher of the Coastal Flooding and Inland Flooding source scores.

RiskByCounty presents county-level source fields and deterministic arithmetic summaries.

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