Lightning Risk in Montana

All Montana counties ranked by FEMA National Risk Index lightning score

Lightning risk — electrical discharges from storms that ignite fires and cause casualties — is rated for 56 of 56 Montana counties in FEMA's National Risk Index. Gallatin County carries the state's highest lightning score at 92.7, with $2M in expected annual lightning losses.

3 Montana counties are rated High or Very High for lightning, and expected annual losses from lightning total roughly $15M statewide. The full ranking below links to each county's complete 18-hazard risk profile.

County Rankings — Lightning

#CountyLightning ScoreRatingAnn. Freq.Ann. Loss
1 Gallatin County
92.7
High 37.00 / yr $2M
2 Yellowstone County
88.2
High 31.99 / yr $1M
3 Big Horn County
83.2
High 32.42 / yr $493K
4 Blaine County
80.1
Medium 24.25 / yr $429K
5 Carbon County
76.8
Medium 34.91 / yr $490K
6 Custer County
76.8
Medium 31.02 / yr $493K
7 Dawson County
74.8
Medium 28.17 / yr $541K
8 Musselshell County
73.9
Medium 30.79 / yr $426K
9 Broadwater County
73.4
Medium 33.11 / yr $491K
10 Cascade County
72.9
Medium 25.09 / yr $604K
11 Petroleum County
69.9
Medium 28.75 / yr $538K
12 Fergus County
69.0
Medium 29.16 / yr $461K
13 Lewis and Clark County
66.3
Medium 24.56 / yr $504K
14 Ravalli County
65.4
Medium 26.85 / yr $394K
15 Phillips County
64.5
Medium 25.61 / yr $282K
16 Missoula County
64.0
Medium 21.74 / yr $605K
17 Beaverhead County
64.0
Medium 34.80 / yr $288K
18 Silver Bow County
61.9
Medium 34.75 / yr $437K
19 Hill County
61.5
Medium 21.68 / yr $284K
20 Park County
60.1
Medium 38.81 / yr $364K
21 Jefferson County
59.0
Medium 34.48 / yr $358K
22 Flathead County
58.9
Medium 20.85 / yr $392K
23 Rosebud County
54.5
Low 30.29 / yr $150K
24 Glacier County
52.4
Low 18.28 / yr $149K
25 Wheatland County
44.2
Low 34.83 / yr $155K
26 Chouteau County
43.9
Low 23.98 / yr $151K
27 Deer Lodge County
41.3
Low 32.49 / yr $151K
28 Stillwater County
39.8
Low 35.26 / yr $226K
29 Golden Valley County
38.3
Low 33.48 / yr $142K
30 Richland County
37.8
Low 27.26 / yr $199K
31 Lake County
37.2
Low 20.53 / yr $125K
32 Madison County
35.9
Low 37.66 / yr $164K
33 Garfield County
35.8
Low 27.49 / yr $158K
34 Judith Basin County
34.0
Low 30.81 / yr $136K
35 Lincoln County
28.6
Low 19.97 / yr $68K
36 Roosevelt County
24.6
Low 26.11 / yr $48K
37 Meagher County
19.8
Very Low 33.14 / yr $61K
38 Sanders County
18.5
Very Low 17.80 / yr $38K
39 Sweet Grass County
18.3
Very Low 36.08 / yr $88K
40 Pondera County
16.5
Very Low 18.56 / yr $36K
41 Valley County
15.6
Very Low 25.78 / yr $52K
42 Powell County
14.8
Very Low 25.47 / yr $42K
43 Toole County
9.7
Very Low 19.57 / yr $26K
44 Sheridan County
8.8
Very Low 25.43 / yr $24K
45 Fallon County
8.6
Very Low 32.11 / yr $38K
46 Granite County
8.2
Very Low 27.85 / yr $24K
47 Prairie County
8.0
Very Low 29.24 / yr $19K
48 Teton County
7.8
Very Low 20.13 / yr $28K
49 Mineral County
5.8
Very Low 18.10 / yr $15K
50 McCone County
5.8
Very Low 26.71 / yr $20K
51 Treasure County
4.9
Very Low 29.49 / yr $21K
52 Powder River County
4.3
Very Low 34.08 / yr $17K
53 Liberty County
3.8
Very Low 20.80 / yr $11K
54 Wibaux County
3.7
Very Low 30.04 / yr $16K
55 Carter County
2.7
Very Low 34.68 / yr $12K
56 Daniels County
2.4
Very Low 25.53 / yr $10K

56 Montana counties with measurable lightning risk. See the national lightning ranking or all Montana counties by overall risk.

Frequently Asked Questions

Which Montana county has the highest lightning risk?

Gallatin County has the highest FEMA lightning risk score in Montana at 92.7 (High), with $2M in expected annual losses and about 37.00 events per year.

How many Montana counties face significant lightning risk?

56 Montana counties record measurable lightning risk in FEMA's National Risk Index; 3 of them are rated High or Very High.

Other Hazards in Montana