Natural disaster risk in Custer County, Idaho
Idaho · population 4,271 · FIPS 16037
Overall: relatively low risk
Custer County has a composite risk score of 52.4 out of 100 — higher than 52% of US counties. It ranks 13 of 44 in Idaho (1 = highest risk). Its highest-rated hazards are avalanche, landslide, wildfire.
Drought now: Yes: D1 Moderate Drought, 27 weeks
Yes. On the U.S. Drought Monitor map valid 13 October 2026, 3.39% of Custer County is in D1 Moderate Drought. Some of it has been at D1 or worse for 27 weeks in a row.
Drought in Custer County: the last 52 weeks · droughtmonitor.unl.edu
The U.S. Drought Monitor is jointly produced by the National Drought Mitigation Center at the University of Nebraska-Lincoln, the United States Department of Agriculture, the National Oceanic and Atmospheric Administration and the National Aeronautics and Space Administration. Map courtesy of NDMC.
Risk, loss, vulnerability and resilience
| Measure | Rating and score |
|---|---|
| Overall risk Expected annual loss, adjusted for social vulnerability and community resilience. |
Relatively low 52.4 |
| Expected annual loss About $10.6 million a year, on average, across all 18 hazards. |
Very low 37.3 |
| Social vulnerability Higher means people may find it harder to prepare and recover. |
Very high 91.6 |
| Community resilience Higher means a stronger ability to prepare, adapt and recover. |
Very low 10 |
Risk by hazard
FEMA's risk rating for each of 18 natural hazards in Custer County, highest first. "Not applicable" means the hazard is not modelled here.
| Hazard | Risk rating and score |
|---|---|
| Avalanche | Very high 96 |
| Landslide | Relatively high 98 |
| Wildfire | Relatively low 87 |
| Earthquake | Relatively low 79 |
| Inland (riverine) flooding | Relatively low 57 |
| Winter weather | Relatively low 50 |
| Lightning | Relatively low 43 |
| Cold wave | Relatively low 30 |
| Volcanic activity | Very low 29 |
| Heat wave | Very low 20 |
| Drought | Very low 15 |
| Strong wind | Very low 15 |
| Ice storm | Very low 7 |
| Hail | Very low 2 |
| Tornado | Very low 2 |
| Coastal flooding | Not applicable |
| Hurricane | Not applicable |
| Tsunami | Not applicable |
FEMA disaster declarations for Custer County
Federal declarations that designated Custer County, since 1 Jan 2024 (the period this site keeps from OpenFEMA). Older declarations are in FEMA's own dataset.
Not since 1 Jan 2024: no FEMA disaster declaration in the records this site read names Custer County.
All FEMA declarations in Idaho, with estimated apply-by dates · Open FEMA deadlines
This product uses the Federal Emergency Management Agency's OpenFEMA API, but is not endorsed by FEMA. The Federal Government or FEMA cannot vouch for the data or analyses derived from these data after the data have been retrieved from the Agency's website(s). Dataset: Disaster Declarations Summaries - v2.
How to read these ratings
- Ratings run in five steps: very low, relatively low, relatively moderate, relatively high and very high. They compare a county with every other US county; they are not a measure of danger on their own.
- Scores run from 0 to 100 and are national percentiles. The bar shows the score: a score of 80 means a higher value than 80% of US counties.
- Overall risk combines the expected annual loss with social vulnerability and community resilience.
- Expected annual loss is the average yearly loss to buildings, people and agriculture the model expects from all 18 hazards.
- Social vulnerability describes how hard it may be for people to prepare for and recover from a disaster. Higher is worse.
- Community resilience describes a community's ability to prepare, adapt and recover. Higher is better.
- "Not applicable" means FEMA does not model that hazard there (for example, hurricanes far inland).
About this data
Source: FEMA National Risk Index, version 1.20, released December 2025, published by the Federal Emergency Management Agency (US public domain). About the National Risk Index. The index is a model of relative risk built from historical hazard records, what is exposed and community factors. It is not a forecast, it does not describe any single property, and it is not insurance or financial advice. For decisions about a specific address, check FEMA's flood maps and your local emergency management office.
Questions
What is the natural disaster risk in Custer County, Idaho?
FEMA's National Risk Index rates the overall risk in Custer County as relatively low, with a score of 52.4 out of 100 (higher than 52% of US counties). That is a comparison with other US counties, not a forecast.
What are the biggest natural hazards in Custer County?
The hazards rated highest for Custer County are avalanche (very high), landslide (relatively high), wildfire (relatively low).
What is the flood risk in Custer County?
FEMA rates inland (river and rain) flooding risk in Custer County as relatively low. For a specific property, check the FEMA flood map and your local floodplain office.
Has Custer County had a FEMA disaster declaration?
Not since 1 Jan 2024: no FEMA disaster declaration in the records this site read names Custer County.
Is Custer County in a drought?
Yes. On the U.S. Drought Monitor map valid 13 October 2026, 3.39% of Custer County is in D1 Moderate Drought. Some of it has been at D1 or worse for 27 weeks in a row.
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