On August 14, 2018, 9 was announced for release in October. In addition, "Rendezvous" was made available for streaming, and the album's track listing was revealed.[6] On September 26, "Kerouac & Cassady" was made available for streaming.[7] On October 16, a music video was released for "Side by Side",[8] directed by Robyn August.[9]9 was released on October 26 through Equal Vision Records. The following month, the group embarked on a US headlining tour with support from Kevin Devine and An Horse.[6] In February and March 2019, they went on another headlining US tour, with support from Remo Drive and Mighty.[7] In August, they went on a co-headlining US tour with Joyce Manor with support from Awakebutstillinbed.[10]
9 was met with mixed or average reviews from critics. At Metacritic, which assigns a weighted average rating out of 100 to reviews from mainstream publications, this release received an average score of 49, based on 4 reviews.[2]