Alaska landslide risk
Petersburg Borough has the highest landslide risk in Alaska, scoring 99.7 out of 100 — rated "Relatively High" by FEMA's National Risk Index.
| # | County | NRI score | Rating |
NOAA events 2016–2026 |
|---|---|---|---|---|
| 1 | Petersburg Borough | 99.7 | Relatively High | 0 |
| 2 | Fairbanks North Star Borough | 99.4 | Relatively High | 0 |
| 3 | Sitka City and Borough | 99.2 | Relatively High | 0 |
| 4 | Anchorage Municipality | 98.9 | Relatively High | 0 |
| 5 | Aleutians East Borough | 97.6 | Relatively Moderate | 0 |
| 6 | Kenai Peninsula Borough | 97.2 | Relatively Moderate | 0 |
| 7 | Chugach Census Area | 97.1 | Relatively Moderate | 0 |
| 8 | Hoonah-Angoon Census Area | 96.9 | Relatively Moderate | 0 |
| 9 | Copper River Census Area | 96.8 | Relatively Moderate | 0 |
| 10 | Matanuska-Susitna Borough | 96.8 | Relatively Moderate | 0 |
| 11 | Kodiak Island Borough | 96.5 | Relatively Moderate | 0 |
| 12 | Haines Borough | 96.3 | Relatively Moderate | 0 |
| 13 | Yakutat City and Borough | 96.1 | Relatively Moderate | 0 |
| 14 | Juneau City and Borough | 95.8 | Relatively Moderate | 0 |
| 15 | Yukon-Koyukuk Census Area | 94.8 | Relatively Moderate | 0 |
| 16 | Prince of Wales-Hyder Census Area | 93.7 | Relatively Moderate | 0 |
| 17 | Skagway Municipality | 92.6 | Relatively Moderate | 0 |
| 18 | Dillingham Census Area | 89.4 | Relatively Moderate | 0 |
| 19 | Aleutians West Census Area | 87.5 | Relatively Moderate | 0 |
| 20 | Wrangell City and Borough | 87.1 | Relatively Low | 0 |
| 21 | Ketchikan Gateway Borough | 87 | Relatively Low | 0 |
| 22 | Southeast Fairbanks Census Area | 86.5 | Relatively Low | 0 |
| 23 | Northwest Arctic Borough | 86.1 | Relatively Low | 0 |
| 24 | Nome Census Area | 85 | Relatively Low | 0 |
| 25 | Denali Borough | 84.8 | Relatively Low | 0 |
| 26 | Kusilvak Census Area | 82.7 | Relatively Low | 0 |
| 27 | Lake and Peninsula Borough | 66.7 | Relatively Low | 0 |
| 28 | Bethel Census Area | 37.8 | Very Low | 0 |
| 29 | North Slope Borough | 13.8 | Very Low | 0 |
| 30 | Bristol Bay Borough | 3.3 | 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 Alaska:
Frequently asked questions
What is the highest landslide risk county in Alaska?
Petersburg Borough, AK has the highest landslide risk in Alaska, with a FEMA National Risk Index score of 99.7 out of 100 (rated "Relatively High").
What causes landslide risk in Alaska?
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.