When Did Hurricane Katrina Hit New Orleans? Verified Timeline and Key Facts

Key Facts at a Glance

Hurricane Katrina made landfall in Louisiana on August 29, 2005, and the most severe impacts on New Orleans occurred late on August 29 into August 30. The following table summarizes the most authoritative and widely cited details about the event.

Attribute	Verified Detail	Source Type
Landfall Date and Time (Louisiana)	August 29, 2005, near 6:45 AM CDT (1145 UTC), Southeast Louisiana	National Hurricane Center (NHC)
Peak Storm Surge in New Orleans	10 to 15 feet above ground level along the Mississippi River-Gulf Outlet and adjacent areas	U.S. Army Corps of Engineers (USACE) post-event analyses
Major Levee and Floodwall Failures	Over 50 breaches in the federal levee and floodwall system; most notably the 17th Street, London Avenue, and Orleans Avenue canals	U.S. Army Corps of Engineers (USACE), Government Accountability Office (GAO)
Date of Widespread Flooding	August 29–30, 2005; most neighborhoods underwater by late August 29 and remained so for weeks	NOAA, Federal Emergency Management Agency (FEMA) after-action reports
Federal Emergency Response Scale	More than 70,000 FEMA personnel deployed at the peak; largest domestic disaster response in U.S. history at the time	FEMA, Department of Homeland Security (DHS)

Why the Date Matters

As a category 3 hurricane at landfall with a large and dangerous footprint, Katrina’s arrival on August 29 defines the scale of preparation, response, and long-term recovery in the Gulf Coast. Accurate dating is essential for emergency planning, historical records, and understanding seasonal risk in the Atlantic basin.

When Did Hurricane Katrina Make Landfall in Louisiana?

Hurricane Katrina made landfall in Louisiana on the morning of August 29, 2005, near Buras-Triumph and then again closer to the Mississippi River–Louisiana border. Sustained winds at final landfall were near 125 mph (195 km/h), with a minimum central pressure of approximately 920 mb. This made Katrina a category 3 on the Saffir–Simpson Hurricane Wind Scale at U.S. landfall. Much of the historic damage, however, was driven by storm surge rather than wind alone.

Timeline of Landfall and Progression

Katrina’s timeline from tropical disturbance to dissipation spanned several critical phases. It formed as a tropical depression on August 23, 2005, over the Bahamas, became a hurricane before striking southern Florida on August 25, rapidly intensified in the Gulf of Mexico, and then struck Louisiana and Mississippi. The most severe wind and surge in New Orleans occurred on the morning and early afternoon of August 29, with levee failures unfolding through the late morning and afternoon. Much of the city remained underwater for weeks.

August 23, 2005: Tropical depression forms near the Bahamas; later becomes a tropical storm.
August 25, 2005: Strikes southern Florida as a category 1 hurricane; crosses into the Gulf of Mexico.
August 28, 2005: Rapid intensification in the Gulf; reaches major hurricane status.
August 29, 2005: Makes landfall in Louisiana; storm surge breaches levees in New Orleans; widespread flooding begins.
August 30, 2005: Continued flooding and rescue efforts; large-scale federal response activated.
Late August–September 2005: Ongoing rescue, sheltering, and initial recovery; gradual drainage of New Orleans.

What Happened in New Orleans When Katrina Landed

While the eye of Katrina passed relatively far to the east, the city experienced catastrophic storm surge that overtopped and then breached the federally designed levee and floodwall system. The most damaging breaches occurred along the 17th Street, London Avenue, and Orleans Avenue canals. The resulting flooding covered roughly 80% of New Orleans, with water depths exceeding 10 feet in many areas and persisting for weeks in lower-lying neighborhoods. The combination of surge, levee failure, and intense rainfall overwhelmed drainage systems and made rescue and evacuation extraordinarily difficult.

Levee and Floodwall Failures

The U.S. Army Corps of Engineers, which designed and built the levees and floodwalls, later determined that system failures were the primary cause of the flooding in New Orleans. The failures resulted from a combination of design flaws, construction errors, and inadequate maintenance. Multiple independent reviews, including those by the American Society of Civil Engineers and the U.S. Government Accountability Office, concluded that the flood protection failed to meet intended safety levels.

Storm Surge and Rainfall Impact

Storm surge from the Gulf of Mexico pushed water into Lake Pontchartrain and into the canals, which then collapsed into surrounding neighborhoods. Rainfall rates of 1 to 2 inches per hour in parts of the city added to the flooding. Because the flood protection was intended to withstand a category 3 hurricane, Katrina exposed clear gaps between design standards and real-world conditions, especially in areas where surge exceeded expected levels.

Emergency Response Timeline

The scale of the disaster prompted a massive federal response. Key points of the emergency timeline include rapid deployment of personnel, challenges with sheltering, and subsequent criticism of early response coordination. The situation in New Orleans drew national and international attention due to widespread displacement, infrastructure loss, and humanitarian needs.

Immediate Response (August 29–31, 2005)

In the hours and days after landfall, local and state resources were quickly overwhelmed. Federal assets began arriving on August 30, with large-scale search and rescue, sheltering, and logistics operations expanding through Labor Day. National Guard units, FEMA, the Coast Guard, and numerous volunteer organizations converged on the region. Evacuation and aid efforts continued for weeks, and the Superdome and other shelters became focal points for public attention and criticism regarding conditions and communication.

Recovery and Long-Term Timeline

Recovery in New Orleans unfolded over months and years, with phased reopening, debris removal, and rebuilding efforts. Population return was gradual, and many neighborhoods faced prolonged disruption. Federal, state, and local governments launched rebuilding initiatives, including changes to land use, housing, and infrastructure design. The event spurred updates to national floodplain management and hurricane preparedness policies, emphasizing resilient infrastructure and improved coordination.

How This Compares to Other Gulf Coast Events

Katrina is often compared to other major Gulf Coast hurricanes, both for its scope and for policy lessons. Historical context helps clarify what made Katrina different and what elements remain relevant for modern hurricane preparedness.

Event	Date	Category at U.S. Landfall	Primary Impacts in New Orleans
Hurricane Betsy	September 9, 1965	Category 4	Widespread wind damage; significant flooding, but limited levee breaches compared to Katrina
Hurricane Gustav	September 1, 2008	Category 2	Strong winds and rain; levee improvements in place reduced severe flooding seen in Katrina
Hurricane Ida	August 29, 2021	Category 4	Severe wind damage; storm surge and flooding, but levee system improvements reduced inundation seen in 2005
Hurricane Katrina	August 29, 2005	Category 3 (at landfall)	Catastrophic storm surge and levee failures; approximately 80% of New Orleans flooded

Preparedness Takeaways for Future Hurricanes

Katrina’s date and impacts remain reference points for hurricane planning. Key takeaways include the importance of treating levees and floodwalls as systemwide infrastructure, investing in regular upgrades and inspections, and planning for scenarios where surge exceeds design assumptions. Modern guidance emphasizes layered protections, clear evacuation routes, robust communication, and equitable sheltering and aid, lessons reflected in updates to national hurricane preparedness frameworks.

Additional Context and Sources

Information in this article is drawn from the National Hurricane Center’s official best track, U.S. Army Corps of Engineers post-event investigations, FEMA after-action reviews, and reports by the Government Accountability Office. These sources underpin the verified details provided here and support long-term, evidence-based hurricane risk communication.