Utah avalanche risk
Salt Lake County has the highest avalanche risk in Utah, scoring 99.1 out of 100 — rated "Very High" by FEMA's National Risk Index.
| # | County | NRI score | Rating |
|---|---|---|---|
| 1 | Salt Lake County | 99.1 | Very High |
| 2 | Summit County | 98.1 | Very High |
| 3 | Sanpete County | 95.5 | Very High |
| 4 | Weber County | 93.4 | Relatively High |
| 5 | Cache County | 93.1 | Relatively High |
| 6 | Utah County | 93 | Relatively High |
| 7 | Wasatch County | 92.5 | Relatively High |
| 8 | Davis County | 90.4 | Relatively High |
| 9 | San Juan County | 89 | Relatively High |
| 10 | Daggett County | 87.9 | Relatively High |
| 11 | Juab County | 87.7 | Relatively High |
| 12 | Washington County | 86.7 | Relatively High |
| 13 | Garfield County | 85.7 | Relatively Moderate |
| 14 | Beaver County | 85.5 | Relatively Moderate |
| 15 | Box Elder County | 83 | Relatively Moderate |
| 16 | Sevier County | 82 | Relatively Moderate |
| 17 | Grand County | 80.6 | Relatively Moderate |
| 18 | Emery County | 75.6 | Relatively Low |
| 19 | Duchesne County | 74.6 | Relatively Low |
| 20 | Millard County | 73.4 | Relatively Low |
| 21 | Rich County | 73.1 | Relatively Low |
| 22 | Morgan County | 71.3 | Relatively Low |
| 23 | Carbon County | 64.5 | Very Low |
| 24 | Kane County | 63.7 | Very Low |
| 25 | Wayne County | 57 | Very Low |
| 26 | Tooele County | 55.7 | Very Low |
| 27 | Piute County | 48.1 | Very Low |
| 28 | Iron County | 45.6 | Very Low |
| 29 | Uintah County | 43.7 | 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 Utah:
Frequently asked questions
What is the highest avalanche risk county in Utah?
Salt Lake County, UT has the highest avalanche risk in Utah, with a FEMA National Risk Index score of 99.1 out of 100 (rated "Very High").
How many counties in Utah are rated Very High for avalanche risk?
3 of 29 scored Utah counties are rated "Very High" for avalanche risk by FEMA's National Risk Index.
What causes avalanche risk in Utah?
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.