Campbell County, Wyoming Natural Disaster Risk
FEMA National Risk Index assessment · WY
LowComposite Risk Score
National percentile: 56th
Campbell County faces low composite natural disaster risk (NRI Risk Index score 56.1, 56th national percentile), driven primarily by hail and wildfire exposure. Expected annual loss across all 18 hazard types is $25M.
Source: FEMA National Risk Index v1.20 · Updated December 2025
Risk Overview
FEMA's National Risk Index rates Campbell County at low composite risk, with a National Risk Index score of 56.1 out of 100 — placing it in the 56th national percentile and below the national average for natural-disaster risk. The score blends Expected Annual Loss, Social Vulnerability, and Community Resilience across all 18 FEMA hazard types.
Most of Campbell County's expected losses come from hail (ice stones from severe thunderstorms that damage property and crops) at High risk — $4M in expected annual loss and about 2.18 events per year; wildfire (uncontrolled fires that spread across wildland and into communities) at Medium risk — $3M in expected annual loss and about 0.00 events per year; and winter weather (heavy snow, blizzards, and hazardous winter conditions) at High risk — $511K in expected annual loss and about 15.55 events per year. Across all hazards, FEMA estimates $25M in expected annual loss for a population of 47K.
Beyond physical exposure, Campbell County has a very low social vulnerability rating (how susceptible the population is to harm) and a very low community resilience rating (its capacity to prepare for and recover from disasters). Both measures sit toward the lower end, indicating relatively modest population sensitivity.
The federal record bears this out: Campbell County has received 6 federal disaster declarations since 1978, including 2 for biological events and 1 for fire events. The most recent was Wildfires (fire), declared in November 2024.
Among 23 Wyoming counties, Campbell County ranks #7 for overall natural disaster risk.
Top Hazards
All 18 Hazard Risks
| Hail | High | 2.18 / yr | $4M |
| Wildfire | Medium | 0.00 / yr | $3M |
| Winter Weather | High | 15.55 / yr | $511K |
| Cold Wave | Medium | 4.77 / yr | $8M |
| Earthquake | Low | 0.00 / yr | $1M |
| Landslide | Low | 3.71 / yr | $7K |
| Lightning | Medium | 38.44 / yr | $487K |
| Tornado | Low | 0.82 / yr | $1M |
| Riverine Flood | Low | 0.75 / yr | $7M |
| Strong Wind | Low | 1.09 / yr | $408K |
| Drought | Very Low | 79.68 / yr | $3K |
| Ice Storm | Very Low | 0.01 / yr | $13K |
| Heat Wave | Very Low | 0.21 / yr | $34K |
| Avalanche | Very Low | 0.00 / yr | $0 |
| Coastal Flood | Very Low | 0.00 / yr | $0 |
| Hurricane | Very Low | 0.00 / yr | $0 |
| Tsunami | Very Low | 0.00 / yr | $0 |
| Volcanic Activity | Very Low | 0.00 / yr | $0 |
Disaster History
Campbell County has received 6 federal disaster declarations since 1978, most recently Wildfires in November 2024. Most frequent causes: Biological (2), Fire (1), Tornado (1).
| Declared | Type | Disaster |
|---|---|---|
| November 2024 | Fire | Wildfires |
| April 2020 | Biological | Covid-19 Pandemic |
| March 2020 | Biological | Covid-19 |
| August 2005 | Tornado | Tornado |
| September 1987 | Toxic Substances | Methane Gas Seepage |
| May 1978 | Flood | Severe Storms, Flooding & Mudslides |
Source: FEMA Disaster Declarations Summaries (OpenFEMA).
Frequently Asked Questions
What is the overall natural disaster risk for Campbell County?
Campbell County has a composite FEMA National Risk Index score of 56.1 out of 100, placing it in the Low category and the 56th national percentile. This combines Expected Annual Loss, Social Vulnerability, and Community Resilience across 18 hazard types.
What are the top natural hazards in Campbell County?
The three highest-rated hazards are Hail (High, $4M EAL), Wildfire (Medium, $3M EAL), Winter Weather (High, $511K EAL). These account for most of the county's expected annual losses.
How does Campbell County compare to other Wyoming counties?
Campbell County ranks #7 of 23 Wyoming counties for overall natural disaster risk, with a low rating.
How many federally declared disasters has Campbell County had?
FEMA records 6 federal disaster declarations for Campbell County since 1978, most often 2 for biological events and 1 for fire events. The most recent was Wildfires, declared in November 2024.
What does Expected Annual Loss (EAL) mean?
EAL is FEMA's estimate of average annual dollar losses from natural hazards, calculated from historical event data and exposure models. Campbell County's $25M EAL is a statistical average, not a guarantee for any specific year or address.