Fremont County, Wyoming Natural Disaster Risk
FEMA National Risk Index assessment · WY
LowComposite Risk Score
National percentile: 60th
Fremont County faces low composite natural disaster risk (NRI Risk Index score 59.7, 60th national percentile), driven primarily by landslide and wildfire exposure. Expected annual loss across all 18 hazard types is $19M.
Source: FEMA National Risk Index v1.20 · Updated December 2025
Risk Overview
Fremont County carries a low composite natural disaster risk, with a National Risk Index score of 59.7 out of 100 — placing it in the 60th 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.
Risk here concentrates in landslide (downhill movement of rock, soil, and debris on unstable slopes) at Medium risk — $265K in expected annual loss and about 7.42 events per year; wildfire (uncontrolled fires that spread across wildland and into communities) at Medium risk — $2M in expected annual loss and about 0.00 events per year; and earthquake (ground shaking from sudden movement along geologic faults) at Low risk — $3M in expected annual loss and about 0.01 events per year. Across all hazards, FEMA estimates $19M in expected annual loss for a population of 39K.
Beyond physical exposure, Fremont County has a medium 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.
History supports the rating: Fremont County has received 6 federal disaster declarations since 2010, including 2 for biological events and 2 for flood events. The most recent was Covid-19 Pandemic (biological), declared in April 2020.
Among 23 Wyoming counties, Fremont County ranks #5 for overall natural disaster risk.
Top Hazards
All 18 Hazard Risks
| Landslide | Medium | 7.42 / yr | $265K |
| Wildfire | Medium | 0.00 / yr | $2M |
| Earthquake | Low | 0.01 / yr | $3M |
| Winter Weather | Medium | 18.28 / yr | $232K |
| Lightning | High | 35.14 / yr | $774K |
| Avalanche | Medium | 1.00 / yr | $392K |
| Cold Wave | Medium | 1.03 / yr | $2M |
| Riverine Flood | Low | 1.50 / yr | $10M |
| Hail | Low | 0.24 / yr | $138K |
| Drought | Low | 75.99 / yr | $39K |
| Strong Wind | Low | 0.29 / yr | $185K |
| Volcanic Activity | Very Low | 0.00 / yr | $0 |
| Tornado | Very Low | 0.34 / yr | $198K |
| Ice Storm | Very Low | 0.01 / yr | $11K |
| Heat Wave | Very Low | 0.11 / yr | $32K |
| Coastal Flood | Very Low | 0.00 / yr | $0 |
| Hurricane | Very Low | 0.00 / yr | $0 |
| Tsunami | Very Low | 0.00 / yr | $0 |
Disaster History
Fremont County has received 6 federal disaster declarations since 2010, most recently Covid-19 Pandemic in April 2020. Most frequent causes: Biological (2), Flood (2), Fire (1).
| Declared | Type | Disaster |
|---|---|---|
| April 2020 | Biological | Covid-19 Pandemic |
| March 2020 | Biological | Covid-19 |
| August 2017 | Flood | Flooding |
| July 2016 | Fire | Lava Mountain Fire |
| July 2011 | Severe Storm | Severe Storms, Flooding, and Landslides |
| July 2010 | Flood | Flooding |
Source: FEMA Disaster Declarations Summaries (OpenFEMA).
Frequently Asked Questions
What is the overall natural disaster risk for Fremont County?
Fremont County has a composite FEMA National Risk Index score of 59.7 out of 100, placing it in the Low category and the 60th national percentile. This combines Expected Annual Loss, Social Vulnerability, and Community Resilience across 18 hazard types.
What are the top natural hazards in Fremont County?
The three highest-rated hazards are Landslide (Medium, $265K EAL), Wildfire (Medium, $2M EAL), Earthquake (Low, $3M EAL). These account for most of the county's expected annual losses.
How does Fremont County compare to other Wyoming counties?
Fremont County ranks #5 of 23 Wyoming counties for overall natural disaster risk, with a low rating.
How many federally declared disasters has Fremont County had?
FEMA records 6 federal disaster declarations for Fremont County since 2010, most often 2 for biological events and 2 for flood events. The most recent was Covid-19 Pandemic, declared in April 2020.
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. Fremont County's $19M EAL is a statistical average, not a guarantee for any specific year or address.