She developed her album "Hadestown" into a stage musical (together with director Rachel Chavkin), which received its US debut at New York Theatre Workshop in summer 2016, and its Canadian debut at the Citadel Theatre, Edmonton the following year. The show opened at London's National Theatre in November 2018 and then on Broadway on April 17, 2019, at the Walter Kerr Theatre. The Broadway production of "Hadestown" won eight Tony Awards in 2019 including the Tony Award for Best Musical. Mitchell received the Tony Award for Best Original Score; she was also nominated for Best Book of a Musical. The Broadway cast album of the show took home the Grammy Award for Best Musical Theater Album in 2020.