Wyoming landslide risk
Big Horn County has the highest landslide risk in Wyoming, scoring 97.9 out of 100 — rated "Relatively High" by FEMA's National Risk Index.
| # | County | NRI score | Rating |
NOAA events 2016–2026 |
|---|---|---|---|---|
| 1 | Big Horn County | 97.9 | Relatively High | 0 |
| 2 | Park County | 97.2 | Relatively Moderate | 0 |
| 3 | Fremont County | 97.1 | Relatively Moderate | 0 |
| 4 | Lincoln County | 95.2 | Relatively Moderate | 0 |
| 5 | Hot Springs County | 95 | Relatively Moderate | 0 |
| 6 | Teton County | 93.8 | Relatively Moderate | 1 |
| 7 | Sublette County | 93.7 | Relatively Moderate | 0 |
| 8 | Washakie County | 93.3 | Relatively Moderate | 0 |
| 9 | Natrona County | 91.7 | Relatively Moderate | 0 |
| 10 | Sweetwater County | 90.6 | Relatively Moderate | 0 |
| 11 | Carbon County | 89.7 | Relatively Moderate | 0 |
| 12 | Albany County | 88.3 | Relatively Moderate | 0 |
| 13 | Uinta County | 79.9 | Relatively Low | 0 |
| 14 | Sheridan County | 76.3 | Relatively Low | 1 |
| 15 | Johnson County | 74.6 | Relatively Low | 0 |
| 16 | Campbell County | 68.2 | Relatively Low | 0 |
| 17 | Converse County | 60.1 | Very Low | 0 |
| 18 | Crook County | 47.4 | Very Low | 0 |
| 19 | Weston County | 45.2 | Very Low | 0 |
| 20 | Platte County | 43.1 | Very Low | 0 |
| 21 | Laramie County | 42.7 | Very Low | 0 |
| 22 | Niobrara County | 35.3 | Very Low | 0 |
| 23 | Goshen County | 20.3 | 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.
Landslide risk nationally:
Other hazard risks in Wyoming:
Frequently asked questions
What is the highest landslide risk county in Wyoming?
Big Horn County, WY has the highest landslide risk in Wyoming, with a FEMA National Risk Index score of 97.9 out of 100 (rated "Relatively High").
What causes landslide risk in Wyoming?
Landslide risk covers expected losses from hillslope failures, rockfalls, and debris flows triggered by heavy rainfall, snowmelt, wildfire, or earthquakes. High scores concentrate in the Pacific Northwest, California coastal ranges, Appalachians, and Rocky Mountain foothills, where steep terrain combines with intense precipitation or seismic activity.