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Montana winter weather risk

56 counties scored 4 rated Very High

Gallatin County has the highest winter weather risk in Montana, scoring 99.6 out of 100 — rated "Very High" by FEMA's National Risk Index.

# County NRI score Rating NOAA events
2016–2026
1 Gallatin County 99.6 Very High 0
2 Cascade County 99.3 Very High 0
3 Yellowstone County 99.1 Very High 0
4 Lewis and Clark County 98.1 Very High 0
5 Lake County 94.4 Relatively High 0
6 Flathead County 94 Relatively High 0
7 Silver Bow County 92.4 Relatively High 0
8 Fergus County 91.8 Relatively High 0
9 Roosevelt County 90.8 Relatively High 0
10 Glacier County 90.7 Relatively High 0
11 Hill County 89.2 Relatively High 0
12 Big Horn County 88.5 Relatively High 0
13 Sanders County 88.1 Relatively High 0
14 Ravalli County 87.4 Relatively High 0
15 Lincoln County 87 Relatively High 0
16 Beaverhead County 86.1 Relatively High 0
17 Custer County 86 Relatively High 0
18 Dawson County 85 Relatively Moderate 0
19 Rosebud County 84.8 Relatively Moderate 0
20 Richland County 82.9 Relatively Moderate 0
21 Park County 82.3 Relatively Moderate 0
22 Blaine County 81.3 Relatively Moderate 0
23 Missoula County 80.6 Relatively Moderate 0
24 Jefferson County 78.3 Relatively Moderate 0
25 Deer Lodge County 77.2 Relatively Moderate 0
26 Sheridan County 77 Relatively Moderate 0
27 Powell County 74.7 Relatively Moderate 0
28 Chouteau County 70.4 Relatively Moderate 0
29 Teton County 68.7 Relatively Moderate 0
30 Phillips County 68.5 Relatively Moderate 0
31 Carbon County 67.7 Relatively Moderate 0
32 Broadwater County 67.4 Relatively Moderate 0
33 Pondera County 65.7 Relatively Moderate 0
34 Musselshell County 63.7 Relatively Moderate 0
35 Valley County 61.5 Relatively Moderate 0
36 Fallon County 58.2 Relatively Low 0
37 Madison County 57.4 Relatively Low 0
38 Mineral County 53.5 Relatively Low 0
39 Stillwater County 51.5 Relatively Low 0
40 Granite County 48.8 Relatively Low 0
41 Liberty County 47.3 Relatively Low 0
42 Meagher County 45.6 Relatively Low 0
43 Carter County 44.7 Relatively Low 0
44 Judith Basin County 43.1 Relatively Low 0
45 Powder River County 42.7 Relatively Low 0
46 Toole County 42 Relatively Low 0
47 Wibaux County 36.9 Relatively Low 0
48 Daniels County 35.6 Relatively Low 0
49 Sweet Grass County 32.1 Relatively Low 0
50 Wheatland County 29.2 Relatively Low 0
51 McCone County 26.3 Relatively Low 0
52 Prairie County 24.6 Relatively Low 0
53 Golden Valley County 21.5 Very Low 0
54 Garfield County 19.9 Very Low 0
55 Petroleum County 12.2 Very Low 0
56 Treasure County 12.1 Very Low 0

Source: FEMA National Risk Index v1.20.0, December 2025. Scores are 0–100 percentile rankings among all US counties. See the methodology page for definitions. Download the full CSV for all counties.

Winter Weather risk nationally:

Top 50 US counties

Other hazard risks in Montana:

WildfireInland FloodingCoastal FloodingEarthquakeHeat WaveTornadoHurricaneHailStrong WindIce StormCold WaveLightningDroughtLandslideAvalancheTsunamiVolcanic Activity

Frequently asked questions

What is the highest winter weather risk county in Montana?

Gallatin County, MT has the highest winter weather risk in Montana, with a FEMA National Risk Index score of 99.6 out of 100 (rated "Very High").

How many counties in Montana are rated Very High for winter weather risk?

4 of 56 scored Montana counties are rated "Very High" for winter weather risk by FEMA's National Risk Index.

What causes winter weather risk in Montana?

Winter weather risk captures expected losses from heavy snow, blizzards, and mixed precipitation. Highest scores appear in the Great Lakes snowbelt, northern Rockies, and interior Northeast, where lake-effect and orographic snowfall is frequent. Winter weather impacts transportation networks, utilities, agriculture, and population health.