Bilbo and Frodo Baggins share the fictional birthday of 22 September in J.R.R. Tolkien’s works.
Bilbo was born on 22 September 2890 of the Third Age, while Frodo was born on 22 September 2968. The date is especially prominent because Bilbo’s eleventy-first birthday party opens The Fellowship of the Ring.
At that party, Bilbo disappears using the One Ring and leaves Hobbiton. Frodo later inherits the Ring and begins the journey that drives The Lord of the Rings. The shared birthday links the two Hobbits while emphasizing the story’s generational structure.
Fans commonly call 22 September Hobbit Day. It should not be confused with Tolkien’s real-world birthday, 3 January 1892, or with the September date on which The Hobbit was first published.