Canadian tech-death virtuosos Archspire and Californian deathgrind titans Cattle Decapitation will lead the lineup for the first-ever Flatline Fest, a metal festival curated by renowned producer Dave Otero. The event will take place June 13–14 at The Oriental Theater in Denver, Colorado, with tickets available via flatlinefest.com.
Otero, who has produced every band on the roster at his Flatline Audio studio in Denver or other locations, said:
“I’ve collaborated with every band in this lineup in the studio over many years and have always wanted to put something like this together. The fest is a chance to celebrate those friendships in one of our favorite independent venues.”
The festival will also feature the live debut of Nuclear Power Trio, a mysterious masked act rumored to include members of Cephalic Carnage, Allegaeon, and Havok.
Confirmed Lineups
Saturday, June 13:
Archspire, Aborted, Nuclear Power Trio, Inferi, Of Feather And Bone, Clusterfux
Sunday, June 14:
Cattle Decapitation, Allegaeon, Cephalic Carnage, The Zenith Passage, In The Company Of Serpents, Necropanther
Fans can expect an intense weekend of tech-death, deathgrind, and extreme metal performances in an intimate, underground venue, making the inaugural Flatline Fest a must-attend for extreme music enthusiasts.
If you’re rocking with The Mosh Network, hit the link and add us as a Preferred Source on Google. That’s the easiest way to keep our latest metal, hardcore, and alternative news, tours, and releases showing up directly in your feed.



1 Comment
Read more:
https://springgreen-caribou-353428.hostingersite.com/flatline-fest-2026-lineup/