Crook County, Wyoming Natural Disaster Risk
FEMA National Risk Index assessment · WY
Very LowComposite Risk Score
National percentile: 16th
Crook County faces very low composite natural disaster risk (NRI Risk Index score 16.1, 16th national percentile), driven primarily by wildfire and hail exposure. Expected annual loss across all 18 hazard types is $6M.
Source: FEMA National Risk Index v1.20 · Updated December 2025
Risk Overview
FEMA's National Risk Index rates Crook County at very low composite risk, with a National Risk Index score of 16.1 out of 100 — placing it in the 16th national percentile and among the lowest-risk counties in the country. The score blends Expected Annual Loss, Social Vulnerability, and Community Resilience across all 18 FEMA hazard types.
Most of Crook County's expected losses come from wildfire (uncontrolled fires that spread across wildland and into communities) at Low risk — $701K in expected annual loss and about 0.00 events per year; hail (ice stones from severe thunderstorms that damage property and crops) at Medium risk — $1M in expected annual loss and about 4.43 events per year; and winter weather (heavy snow, blizzards, and hazardous winter conditions) at Medium risk — $122K in expected annual loss and about 19.94 events per year. Across all hazards, FEMA estimates $6M in expected annual loss for a population of 7K.
Beyond physical exposure, Crook County has a 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: Crook County has received 7 federal disaster declarations since 1978, including 2 for biological events and 2 for severe storm events. The most recent was Covid-19 Pandemic (biological), declared in April 2020.
Among 23 Wyoming counties, Crook County ranks #20 for overall natural disaster risk.
Top Hazards
All 18 Hazard Risks
| Wildfire | Low | 0.00 / yr | $701K |
| Hail | Medium | 4.43 / yr | $1M |
| Winter Weather | Medium | 19.94 / yr | $122K |
| Cold Wave | Low | 4.79 / yr | $1M |
| Landslide | Very Low | 0.72 / yr | $1K |
| Lightning | Low | 39.54 / yr | $115K |
| Earthquake | Very Low | 0.00 / yr | $68K |
| Tornado | Very Low | 0.58 / yr | $292K |
| Riverine Flood | Very Low | 0.68 / yr | $2M |
| Drought | Very Low | 72.84 / yr | $3K |
| Strong Wind | Low | 1.91 / yr | $159K |
| Ice Storm | Very Low | 0.02 / yr | $4K |
| Heat Wave | Very Low | 0.13 / yr | $4K |
| Avalanche | Very Low | 0.01 / yr | $1 |
| 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
Crook County has received 7 federal disaster declarations since 1978, most recently Covid-19 Pandemic in April 2020. Most frequent causes: Biological (2), Severe Storm (2), Fire (2).
| Declared | Type | Disaster |
|---|---|---|
| April 2020 | Biological | Covid-19 Pandemic |
| March 2020 | Biological | Covid-19 |
| July 2011 | Severe Storm | Severe Storms, Flooding, and Landslides |
| July 2006 | Fire | Thorn Divide Fire Complex |
| September 2001 | Fire | Wy - Mcfarland Divide Fire - 09/06/01 |
| December 2000 | Severe Storm | Severe Winter Storm |
| May 1978 | Flood | Severe Storms, Flooding & Mudslides |
Source: FEMA Disaster Declarations Summaries (OpenFEMA).
Frequently Asked Questions
What is the overall natural disaster risk for Crook County?
Crook County has a composite FEMA National Risk Index score of 16.1 out of 100, placing it in the Very Low category and the 16th national percentile. This combines Expected Annual Loss, Social Vulnerability, and Community Resilience across 18 hazard types.
What are the top natural hazards in Crook County?
The three highest-rated hazards are Wildfire (Low, $701K EAL), Hail (Medium, $1M EAL), Winter Weather (Medium, $122K EAL). These account for most of the county's expected annual losses.
How does Crook County compare to other Wyoming counties?
Crook County ranks #20 of 23 Wyoming counties for overall natural disaster risk, with a very low rating.
How many federally declared disasters has Crook County had?
FEMA records 7 federal disaster declarations for Crook County since 1978, most often 2 for biological events and 2 for severe storm 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. Crook County's $6M EAL is a statistical average, not a guarantee for any specific year or address.