Volcanic Activity Risk in Wyoming
All Wyoming counties ranked by FEMA National Risk Index volcanic activity score
Volcanic Activity risk — eruptions producing ashfall, lava, and pyroclastic hazards — is rated for 9 of 23 Wyoming counties in FEMA's National Risk Index. Teton County carries the state's highest volcanic activity score at 65.1, with $86 in expected annual volcanic activity losses.
No Wyoming county reaches the High band for volcanic activity, and expected annual losses from volcanic activity total roughly $106 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 | Teton County | Very Low | 0.00 / yr | $86 | |
| 2 | Park County | Very Low | 0.00 / yr | $8 | |
| 3 | Lincoln County | Very Low | 0.00 / yr | $7 | |
| 4 | Big Horn County | Very Low | 0.00 / yr | $3 | |
| 5 | Washakie County | Very Low | 0.00 / yr | $2 | |
| 6 | Fremont County | Very Low | 0.00 / yr | $0 | |
| 7 | Sublette County | Very Low | 0.00 / yr | $0 | |
| 8 | Hot Springs County | Very Low | 0.00 / yr | $0 | |
| 9 | Sheridan County | Very Low | 0.00 / yr | $0 |
9 Wyoming counties with measurable volcanic activity risk. See the national volcanic activity ranking or all Wyoming counties by overall risk.
Frequently Asked Questions
Which Wyoming county has the highest volcanic activity risk?
Teton County has the highest FEMA volcanic activity risk score in Wyoming at 65.1 (Very Low), with $86 in expected annual losses and about 0.00 events per year.
How many Wyoming counties face significant volcanic activity risk?
9 Wyoming counties record measurable volcanic activity risk in FEMA's National Risk Index; 0 of them are rated High or Very High.