Four Category 5 hurricanes have made landfall in the contiguous United States since modern Atlantic hurricane record-keeping began. They were the Labor Day hurricane of 1935, Hurricane Camille in 1969, Hurricane Andrew in 1992, and Hurricane Michael in 2018.
The Labor Day hurricane struck the Florida Keys on September 2, 1935, and remains the most intense U.S. landfall by central pressure. Camille hit the Mississippi coast in August 1969, while Andrew crossed South Florida in August 1992 before later reaching Louisiana as a weaker storm. Michael made landfall near Mexico Beach, Florida, on October 10, 2018, with Category 5 winds.
Katrina is a frequent wrong answer because it reached Category 5 strength over the Gulf of Mexico and became one of the most destructive hurricanes in U.S. history. However, it weakened to Category 3 before its Louisiana–Mississippi landfall. The count of four refers to the contiguous or mainland United States; including U.S. territories involves a different scope.