Arapahoe County Disaster Risk
Arapahoe County, Colorado
FEMA Risk Rating
Relatively Moderate
National Percentile
94th
of 3,144 counties
State Rank
#4
of 64 (1 = highest risk)
Flood Risk
93th
percentile
Hazard Risk Breakdown
Flood
River, coastal, and surface flooding risk
Moderate
Higher than 93% of US counties
Wildfire
Wildland and wildland-urban interface fire risk
Moderate
Higher than 85% of US counties
Tornado
Tornado and severe thunderstorm risk
Relatively High
Higher than 97% of US counties
Earthquake
Seismic activity and ground shaking risk
Moderate
Higher than 85% of US counties
Risk Overview
About Natural Disaster Risk in Arapahoe County, Colorado
Arapahoe County faces one of Colorado's highest risks
Arapahoe County scores 93.80 on the composite risk scale, among the highest in the state and well above national averages, indicating relatively moderate but substantial multi-hazard exposure. This score reflects acute vulnerabilities to tornadoes, flooding, and other major disaster types.
Among the riskiest counties in Colorado overall
With a composite score of 93.80 versus Colorado's state average of 40.67, Arapahoe faces more than double typical statewide hazard exposure. Only Boulder and Adams counties rival its elevated disaster risk profile.
Arapahoe leads metro Denver in disaster risk
Arapahoe's 93.80 score significantly exceeds Adams (91.19) to the north and outpaces Broomfield (34.70) dramatically, making it the highest-risk county in the immediate Denver region. This elevated exposure reflects geographic and demographic factors that concentrate hazard vulnerability.
Tornadoes and floods dominate the hazard landscape
Tornado risk of 97.23 ranks as the single greatest threat, with flooding close behind at 92.53—both among Colorado's highest recorded scores. Wildfire exposure (84.70) and earthquake risk (85.50) further compound the county's multi-layered vulnerability.
Comprehensive coverage is non-negotiable here
Arapahoe residents must carry both flood insurance (covering the 92.53 risk score) and understand tornado shelter options, as standard homeowner policies exclude both hazards. Earthquake coverage should also be considered given the 85.50 risk level, making multi-peril protection essential.
Source: FEMA National Risk Index · Narrative reviewed by Evan Brooks, Data Editor
Preparedness Guide
What to Prepare for in Arapahoe County
Top Hazards by Exposure
Source: FEMA National Risk Index v1.19.0 · Percentiles are national (3,144 counties)
Risk Advisory: Arapahoe County
Risk Verdict
At the 94th percentile nationally, Arapahoe County sits in the upper half of U.S. counties for natural disaster exposure. At this risk level, having a documented household preparedness plan — not just awareness — is the meaningful next step for Arapahoe County residents.
Hazard Breakdown
Tornado risk is Arapahoe County's dominant natural hazard, ranked at the 97th percentile nationally under FEMA's National Risk Index. Flood ranks second at the 93th percentile nationally. Additional tracked hazards include earthquake (85th percentile), wildfire (85th percentile).
Preparedness Context
Tornado exposure at the 97th percentile nationally makes Arapahoe County a county where a battery-powered weather radio — not just smartphone apps — is a worthwhile household investment, given that mobile networks often fail during severe storms. Alongside tornado exposure, flood at the 93th percentile nationally means Arapahoe County households face multi-hazard severe-weather seasons that benefit from a single integrated emergency plan covering both threats. In Arapahoe County, tornado watches indicate favorable atmospheric conditions while warnings mean rotation has been detected — households benefit from understanding this distinction so they shelter immediately on a warning, not after seeking visual confirmation.
Regional Context
The Colorado county average is 53.1 composite points below Arapahoe County's score, a gap that reflects the county's elevated position in the state's hazard distribution.
Is your household prepared for Arapahoe County's hazards?
Review FEMA's county-specific preparedness checklists and emergency planning guides.
Frequently Asked Questions
What is the natural disaster risk in Arapahoe County, CO?
What types of natural hazards affect Arapahoe County?
How does Arapahoe County risk compare to the Colorado average?
Is Arapahoe County at risk for tornado?
How is natural disaster risk measured?
Why is Arapahoe County higher risk than average?
Data Source
Risk data sourced from the FEMA National Risk Index (NRI). Risk scores are relative rankings (0–100) across all US counties — not absolute risk measures. Higher scores indicate higher relative risk compared to other counties.
Disclaimer: This data is informational only. It is not financial, insurance, or legal advice. Always consult a qualified professional before making insurance or real estate decisions.