Slothrust consists of Leah Wellbaum, Kyle Bann, and Will Gorin. Wellbaum and Gorin first began collaborating as students at Sarah Lawrence College. After performing in various school groups, the two joined to create music with a "heavier" sound. In search for a bassist, Bann later joined the band. The name Slothrust came together as a combination of Wellbaum's former project "Slothbox" and "rust" to signify time passing.
2012–2013: ''Feels Your Pain''
The band released their debut albumFeels Your Pain, featuring their lead single "7:30 AM". The track was later featured as the opening theme song for FX's television seriesYou're the Worst. In November, Slothrust collaborated with Wreckroom Records to record a cover of The Turtles' "Happy Together".
On July 7, 2016, it was announced that Slothrust were signing to Dangerbird Records. The band premiered several tracks that lead to the release of their third full-length album, Everyone Else. The first single, "Horseshoe Crab", premiered via Noisey on August 10, 2016, was explained as "a dark narrative about love, loss, growing up, depression, and existential anxiety". Slothrust later shared "Like A Child Hiding Behind You Tombstone", and "Horseshoe Crab". Everyone Else debuted on October 28, 2016. The new record is described as less angry and closely relating to dreams and the water, "Of Course You Do, as well as the one before that, Feels Your Pain, are a bit angrier. When you write songs earlier in your life—depending on where you’re at—the likelihood of them being angsty is higher," Wellbaum explained to Out Magazine, "This record I don’t think is angry in the same way. It asks more questions... has space for interpretation and for questions. And the new record deals very specifically with water and dreams in a way that the first two did not." Kicking off the release of Everyone Else, the band announced they a tour with rock band Highly Suspect in the fall of 2016. Additionally, the band celebrated the new album with a sold-out headline show at Brooklyn's Rough Trade music store/venue on November 1. The band performed Everyone Else in its entirety, including various fan favorites such as "7:30 AM", "Crockpot" and "Homewreck Wifey". The band spent in majority of 2017 touring, including two US headline tour in March, July and August. The band also performed at Chicago's Lollapalooza. On August 3, 2017, it was announced that Slothrust will be touring the UK in the fall with Manchester Orchestra. On August 8, 2017, Slothrust premiered a B-side track titled "Milking The Snake", via DIY''.
2018–present: ''The Pact''
After months of recording early in the year, The Pact was released on September 14, 2018. On release day, the band kicked off a two-month long tour to promote the album. Videos were released for the tracks '"Peach" and "Double Down".