National Cheeseburger Day in 2025 is celebrated on Thursday, September 18. It is a day dedicated to honoring the cheeseburger, one of America's favorite foods, often marked by special deals and promotions at various restaurants and fast food chains on that date.
The date September 20 mentioned in some deals is related to promotions following National Cheeseburger Day, such as free cheeseburger offers with purchases on Sept. 20 and Sept. 21, but National Cheeseburger Day itself is on September 18.