The Most Important Thing to Understand About Evacuation Zones
This is the single most common misconception about hurricane preparedness: evacuation zones are not about wind — they are about storm surge.
Storm surge is the abnormal rise of water generated by a hurricane's winds and low pressure pushing the ocean inland. It is the deadliest hurricane hazard, responsible for approximately 49% of all direct hurricane fatalities in the United States. A Category 4 hurricane can push a wall of water 20 feet high or more inland — flooding areas miles from the coast that would otherwise never flood.
Evacuation zones are drawn by local emergency management agencies using detailed storm surge modeling from NOAA's SLOSH (Sea, Lake, and Overland Surges from Hurricanes) model. Each zone represents the area that would be inundated by storm surge from storms of increasing intensity.
What Do the Zone Letters Mean?
Most coastal counties in the United States use a lettered zone system, though some use numbers (Zone 1, Zone 2, etc.) and the terminology varies slightly by state. Here is the general framework:
| Zone | Risk Level | Typical Storm Trigger | Action Required |
|---|---|---|---|
| Zone A | Highest | Any hurricane, including Category 1 | Mandatory evacuation when ordered |
| Zone B | High | Category 2 or higher | Mandatory or voluntary evacuation |
| Zone C | Moderate | Category 3 or higher | Voluntary evacuation recommended |
| Zone D | Lower | Category 4 or higher | Shelter in place may be appropriate |
| Zone E/F | Lowest | Major Category 5 only | Monitor conditions closely |
Zone A is always evacuated first. If you are in Zone A and a mandatory evacuation order is issued, you must leave. Staying in a Zone A area during a major hurricane is life-threatening.
How Zones Are Determined
Emergency managers use NOAA's SLOSH model to simulate thousands of hypothetical storms making landfall at different intensities, speeds, and angles. The model calculates the maximum storm surge each area would experience across all these scenarios. The results are combined into a "Maximum of the Maximum" (MOM) envelope — the worst-case surge for each location.
Zone A typically encompasses areas that would flood in the MOM scenario for a Category 1 hurricane. Zone B adds the additional area flooded by a Category 2, and so on. This means that even a relatively weak storm can be catastrophic for Zone A residents.
Critical Misconceptions That Get People Killed
"I survived the last hurricane without evacuating, so I'll be fine."
Survivorship bias is one of the most dangerous factors in hurricane fatalities. The fact that you survived a previous storm in your home does not mean you will survive the next one. Every hurricane is different — track, intensity, speed, and angle of approach all affect storm surge in ways that cannot be predicted weeks in advance. Emergency managers call this "the last storm syndrome."
"My house is elevated, so I don't need to worry about storm surge."
Elevation helps, but it is not a guarantee. Storm surge can exceed 20 feet in extreme events. If you are in Zone A, your local emergency management agency has determined that your location is at risk regardless of your home's elevation above sea level.
"The storm weakened — I don't need to evacuate anymore."
Hurricane intensity can change rapidly in the hours before landfall. More importantly, storm surge is not solely determined by wind speed at landfall. A large, slow-moving Category 2 can produce more storm surge than a fast-moving Category 3 because it pushes water for longer. Never cancel an evacuation based on a storm weakening — wait for official guidance from your local emergency management agency.
How to Find Your Evacuation Zone
The fastest way to find your evacuation zone is to use our Storm Surge Lookup tool. Enter your ZIP code to see:
- Your official evacuation zone designation
- Your storm surge risk level
- Your current evacuation status
- The nearest public shelter
You can also contact your county or city emergency management office directly. Most coastal counties have evacuation zone maps available on their official websites. Florida, Texas, Louisiana, North Carolina, South Carolina, Georgia, Virginia, and New York all publish detailed zone maps online.
When Should You Leave?
The answer is: earlier than you think. Emergency managers consistently report that the biggest problem during hurricane evacuations is that people wait too long. Here is a general timeline based on storm track and intensity:
- 72+ hours before landfall: Begin monitoring the storm. Gather supplies. Review your evacuation route.
- 48–72 hours before landfall: Zone A evacuations are typically ordered. If you are in Zone A, leave now. Traffic will be manageable.
- 24–48 hours before landfall: Zone B and C evacuations may be ordered. Roads will be congested. Fuel may be scarce.
- Under 24 hours: If you have not left yet and you are in an evacuation zone, you are in serious danger. Sheltering in place may now be your only option.
What to Take When You Evacuate
Use our Prep Checklist Builder to generate a personalized evacuation kit list. At minimum, you should have:
- Important documents (ID, insurance policies, medical records) in a waterproof bag
- Medications — at least a 7-day supply
- Cash (ATMs may not work after a storm)
- Phone chargers and a portable battery pack
- Water and non-perishable food for 3 days
- Pet supplies if you have animals
Sign Up for Evacuation Alerts
Our Storm Alert system sends you SMS and email notifications when evacuation orders are issued for your area. Sign up before hurricane season — not when a storm is already forming.