Arizona avalanche risk
Coconino County has the highest avalanche risk in Arizona, scoring 81.7 out of 100 — rated "Relatively Moderate" by FEMA's National Risk Index.
| # | County | NRI score | Rating |
|---|---|---|---|
| 1 | Coconino County | 81.7 | Relatively Moderate |
| 2 | Mohave County | 68.6 | Relatively Low |
| 3 | Gila County | 58 | Very Low |
| 4 | Graham County | 54.4 | Very Low |
| 5 | Cochise County | 54.2 | Very Low |
| 6 | Yavapai County | 53.8 | Very Low |
| 7 | Navajo County | 50.9 | Very Low |
| 8 | Apache County | 50.7 | Very Low |
| 9 | Pima County | 46.3 | Very Low |
| 10 | Greenlee County | 43.6 | Very Low |
| 11 | Maricopa County | 32.9 | Very Low |
| 12 | Santa Cruz County | 31 | Very Low |
| 13 | Pinal County | 26.2 | Very Low |
| 14 | La Paz County | 13.9 | 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 Arizona:
Frequently asked questions
What is the highest avalanche risk county in Arizona?
Coconino County, AZ has the highest avalanche risk in Arizona, with a FEMA National Risk Index score of 81.7 out of 100 (rated "Relatively Moderate").
What causes avalanche risk in Arizona?
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.