Volcanic Activity Risk in Montana
All Montana counties ranked by FEMA National Risk Index volcanic activity score
Volcanic Activity risk — eruptions producing ashfall, lava, and pyroclastic hazards — is rated for 7 of 56 Montana counties in FEMA's National Risk Index. Carbon County carries the state's highest volcanic activity score at 26.1, with $1 in expected annual volcanic activity losses.
No Montana county reaches the High band for volcanic activity, and expected annual losses from volcanic activity total roughly $2 statewide. The full ranking below links to each county's complete 18-hazard risk profile.
County Rankings — Volcanic Activity
| # | County | Volcanic Activity Score | Rating | Ann. Freq. | Ann. Loss |
|---|---|---|---|---|---|
| 1 | Carbon County | Very Low | 0.00 / yr | $1 | |
| 2 | Gallatin County | Very Low | 0.00 / yr | $1 | |
| 3 | Park County | Very Low | 0.00 / yr | $0 | |
| 4 | Madison County | Very Low | 0.00 / yr | $0 | |
| 5 | Beaverhead County | Very Low | 0.00 / yr | $0 | |
| 6 | Big Horn County | Very Low | 0.00 / yr | $0 | |
| 7 | Stillwater County | Very Low | 0.00 / yr | $0 |
7 Montana counties with measurable volcanic activity risk. See the national volcanic activity ranking or all Montana counties by overall risk.
Frequently Asked Questions
Which Montana county has the highest volcanic activity risk?
Carbon County has the highest FEMA volcanic activity risk score in Montana at 26.1 (Very Low), with $1 in expected annual losses and about 0.00 events per year.
How many Montana counties face significant volcanic activity risk?
7 Montana counties record measurable volcanic activity risk in FEMA's National Risk Index; 0 of them are rated High or Very High.