Bilbo and Frodo Baggins celebrate their birthday on 22 September in J.R.R. Tolkien’s legendarium.
Bilbo was born on 22 September T.A. 2890, while Frodo was born on 22 September T.A. 2968. Tolkien uses the shared date to connect the two hobbits, whose lives become central to the history of the One Ring.
Bilbo’s eleventy-first birthday party is the opening major event of The Lord of the Rings. During the celebration, Bilbo disappears using the Ring and leaves the Shire. Frodo later inherits the Ring and begins the quest that forms the main plot of the trilogy.
Readers sometimes describe 22 September simply as “Hobbit Day,” but that modern celebration is not a formal universal holiday established by Tolkien. The date itself is firmly part of the fictional chronology and is also associated with Tolkien’s own birthday in fan observances.