National Cheeseburger Day (often just called “cheeseburger day”) is celebrated every year on September 18.

Quick Scoop

  • Date every year: September 18.
  • In 2026, it falls on a Friday.
  • It’s an unofficial food holiday in the US dedicated to enjoying cheeseburgers, from classic styles to creative gourmet versions.

A bit of context

National Cheeseburger Day is treated as a fun “food holiday,” with many chains and local spots running special deals or limited-time menu items on that date. Some guides even highlight social media trends, like posting burger photos or using themed hashtags to join the conversation that day.

In short: if you want to plan around cheeseburger day, mark September 18 on your calendar every year.

TL;DR: When is cheeseburger day? It’s every year on September 18, with 2026’s celebration landing on a Friday.

Information gathered from public forums or data available on the internet and portrayed here.