Wyoming avalanche risk
Teton County has the highest avalanche risk in Wyoming, scoring 100 out of 100 — rated "Very High" by FEMA's National Risk Index.
| # | County | NRI score | Rating |
|---|---|---|---|
| 1 | Teton County | 100 | Very High |
| 2 | Lincoln County | 98.7 | Very High |
| 3 | Carbon County | 92.1 | Relatively High |
| 4 | Sublette County | 90.5 | Relatively High |
| 5 | Park County | 86.8 | Relatively High |
| 6 | Albany County | 83.8 | Relatively Moderate |
| 7 | Natrona County | 81.6 | Relatively Moderate |
| 8 | Fremont County | 81 | Relatively Moderate |
| 9 | Sheridan County | 80.8 | Relatively Moderate |
| 10 | Hot Springs County | 77.2 | Relatively Low |
| 11 | Big Horn County | 32.3 | Very Low |
| 12 | Johnson County | 26 | Very Low |
| 13 | Washakie County | 19 | Very Low |
| 14 | Sweetwater County | 12.6 | Very Low |
| 15 | Converse County | 8.9 | Very Low |
| 16 | Platte County | 4.2 | Very Low |
| 17 | Crook County | 3.7 | Very Low |
| 18 | Weston County | 1.8 | Very Low |
| 19 | Laramie County | 1.6 | Very Low |
| 20 | Goshen County | 0.7 | Very Low |
| 21 | Uinta County | 0.3 | Very Low |
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.
Avalanche risk nationally:
Other hazard risks in Wyoming:
Frequently asked questions
What is the highest avalanche risk county in Wyoming?
Teton County, WY has the highest avalanche risk in Wyoming, with a FEMA National Risk Index score of 100 out of 100 (rated "Very High").
How many counties in Wyoming are rated Very High for avalanche risk?
2 of 21 scored Wyoming counties are rated "Very High" for avalanche risk by FEMA's National Risk Index.
What causes avalanche risk in Wyoming?
Avalanche risk reflects expected annual losses from snow avalanche events, primarily affecting mountain counties in the West. The highest scores belong to Colorado, Utah, Montana, and Washington counties where active ski terrain, mountain highways, and communities overlap with historically active avalanche paths and high seasonal snowpack. Avalanche events are reported at forecast-zone level in NOAA Storm Events and are not included in county-level counts.