riskbycounty
FEMA NRI v1.20Released December 2025Methodology

Yellowstone County Disaster Risk

Yellowstone County, Montana

FEMA Risk Rating

Relatively Moderate

NRI score (0–100 relative scale)

83.6

FEMA composite county value

State Rank

#2

of 56, sorted high to low by RiskByCounty

Flood NRI score

84.5

higher coastal/inland value

Hazard Risk Breakdown

Five selected hazard categories out of FEMA's 18. Values are FEMA NRI v1.20 scores on a 0–100 relative scale.

Wildfire

93.4 / 100

Flood

84.5 / 100

Higher of FEMA Coastal Flooding (Not available) and Inland Flooding (84.5) NRI scores.

Earthquake

74.7 / 100

Tornado

28.9 / 100

FEMA NRI data summary

Selected hazard scores for Yellowstone County

Among the five hazard categories displayed by RiskByCounty, wildfire has the highest NRI score for this county.

Wildfire
93.4
Flood
84.5
Earthquake
74.7
Tornado
28.9
Hurricane
Not available

Higher of FEMA Coastal Flooding and Inland Flooding NRI scores

Displayed flood score
84.5
Coastal Flooding
Not available
Inland Flooding
84.5

These five categories are a selected subset of FEMA's 18 natural hazards. FEMA's composite score and official rating are separate fields in the National Risk Index dataset.

FEMA National Risk Index documentation

Official Ready.gov resource

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

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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.
What FEMA NRI information is available for Yellowstone County, MT?
Yellowstone County has an official FEMA NRI v1.20 composite rating of Relatively Moderate and an NRI score (0–100 relative scale) of 83.6. RiskByCounty ranks it 2nd of 56 Montana county records when sorting the FEMA composite NRI scores from high to low.
Which selected hazard scores are shown for Yellowstone County?
RiskByCounty displays five selected hazard categories out of FEMA's 18 using FEMA NRI v1.20 (December 2025). For Yellowstone County, Wildfire: 93.4; Flood: 84.5; Earthquake: 74.7; Tornado: 28.9.
How is flood displayed for Yellowstone County?
RiskByCounty's flood display is the higher of FEMA Coastal Flooding and Inland Flooding NRI scores. For Yellowstone County, Coastal Flooding is Not available, Inland Flooding is 84.5, and the displayed flood score is 84.5.

Counties with Similar Risk

Cascade County

Montana

-0.4

Relatively Moderate

NRI score 83.1

Gallatin County

Montana

-2.6

Relatively Moderate

NRI score 81.0

Flathead County

Montana

+2.9

Relatively Moderate

NRI score 86.5

Published by RiskByCounty

County summaries are deterministic transformations of frozen FEMA county fields. No external subject-matter reviewer is credited.

Published · Updated

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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