Miami-Dade County, Florida Natural Disaster Risk
FEMA National Risk Index assessment · FL
Very HighComposite Risk Score
National percentile: 100th
Miami-Dade County faces very high composite natural disaster risk (NRI Risk Index score 99.6, 100th national percentile), driven primarily by hurricane and lightning exposure. Expected annual loss across all 18 hazard types is $825M.
Source: FEMA National Risk Index v1.20 · Updated December 2025
Risk Overview
Overall natural disaster risk in Miami-Dade County is very high, with a National Risk Index score of 99.6 out of 100 — placing it in the 100th national percentile and among the most at-risk counties in the United States. The score blends Expected Annual Loss, Social Vulnerability, and Community Resilience across all 18 FEMA hazard types.
Most of Miami-Dade County's expected losses come from hurricane (tropical cyclones bringing extreme wind, rain, and storm surge) at Very High risk — $331M in expected annual loss and about 0.30 events per year; lightning (electrical discharges from storms that ignite fires and cause casualties) at Very High risk — $8M in expected annual loss and about 97.70 events per year; and riverine flood (rivers and streams overflowing their banks after heavy rain or snowmelt) at Very High risk — $356M in expected annual loss and about 4.00 events per year. Across all hazards, FEMA estimates $825M in expected annual loss for a population of 2.7M.
Beyond physical exposure, Miami-Dade County has a high social vulnerability rating (how susceptible the population is to harm) and a medium community resilience rating (its capacity to prepare for and recover from disasters). That combination — a more vulnerable population with limited resilience — can amplify the human cost of any given event.
The federal record bears this out: Miami-Dade County has received 43 federal disaster declarations since 1965, including 23 for hurricane events and 5 for severe storm events. The most recent was Hurricane Milton (hurricane), declared in October 2024.
Among 67 Florida counties, Miami-Dade County ranks #1 for overall natural disaster risk.
Top Hazards
All 18 Hazard Risks
| Hurricane | Very High | 0.30 / yr | $331M |
| Lightning | Very High | 97.70 / yr | $8M |
| Riverine Flood | Very High | 4.00 / yr | $356M |
| Coastal Flood | Very High | 2.25 / yr | $23M |
| Cold Wave | Very High | 1.28 / yr | $41M |
| Heat Wave | High | 6.16 / yr | $31M |
| Tornado | High | 1.07 / yr | $25M |
| Wildfire | Medium | 0.01 / yr | $5M |
| Hail | High | 0.56 / yr | $3M |
| Strong Wind | Medium | 0.76 / yr | $1M |
| Drought | Medium | 8.94 / yr | $663K |
| Earthquake | Low | 0.00 / yr | $385K |
| Landslide | Very Low | 0.19 / yr | $820 |
| Avalanche | Very Low | 0.00 / yr | $0 |
| Ice Storm | Very Low | 0.00 / yr | $0 |
| Tsunami | Very Low | 0.00 / yr | $0 |
| Volcanic Activity | Very Low | 0.00 / yr | $0 |
| Winter Weather | Very Low | 0.00 / yr | $0 |
Disaster History
Miami-Dade County has received 43 federal disaster declarations since 1965, most recently Hurricane Milton in October 2024. Most frequent causes: Hurricane (23), Severe Storm (5), Freezing (5).
| Declared | Type | Disaster |
|---|---|---|
| October 2024 | Hurricane | Hurricane Milton |
| October 2024 | Hurricane | Hurricane Milton |
| December 2022 | Hurricane | Hurricane Nicole |
| November 2022 | Tropical Storm | Tropical Storm Nicole |
| September 2022 | Hurricane | Hurricane Ian |
| September 2022 | Hurricane | Tropical Storm Ian |
| July 2021 | Severe Storm | Tropical Storm Elsa |
| June 2021 | Other | Surfside Building Collapse |
| August 2020 | Hurricane | Hurricane Isaias |
| March 2020 | Biological | Covid-19 Pandemic |
Showing the 10 most recent of 43 declarations.
Source: FEMA Disaster Declarations Summaries (OpenFEMA).
Frequently Asked Questions
What is the overall natural disaster risk for Miami-Dade County?
Miami-Dade County has a composite FEMA National Risk Index score of 99.6 out of 100, placing it in the Very High category and the 100th national percentile. This combines Expected Annual Loss, Social Vulnerability, and Community Resilience across 18 hazard types.
What are the top natural hazards in Miami-Dade County?
The three highest-rated hazards are Hurricane (Very High, $331M EAL), Lightning (Very High, $8M EAL), Riverine Flood (Very High, $356M EAL). These account for most of the county's expected annual losses.
How does Miami-Dade County compare to other Florida counties?
Miami-Dade County ranks #1 of 67 Florida counties for overall natural disaster risk, with a very high rating.
How many federally declared disasters has Miami-Dade County had?
FEMA records 43 federal disaster declarations for Miami-Dade County since 1965, most often 23 for hurricane events and 5 for severe storm events. The most recent was Hurricane Milton, declared in October 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. Miami-Dade County's $825M EAL is a statistical average, not a guarantee for any specific year or address.