Flatline Audio owner/producer Dave Otero has announced Flatline Fest, a new two-day extreme metal festival set for June 13–14, 2026 at the Oriental Theater in Denver, CO.
Tickets are on sale now, here.
The inaugural event will be headlined by Archspire and Cattle Decapitation, with the lineup curated from artists Otero has worked with throughout his production career.
Otero shared the following:
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 first-ever live performance from Nuclear Power Trio, the masked Metal Blade Records project making its stage debut after remaining studio-only since their 2020 debut.
Flatline Fest is being presented by Otero alongside his fiancé and co-promoter Chelsea Lowe. Additional lineup details and ticket information are expected to be announced.
Announced line up thus far:
Saturday, June 13th:
Archspire
Aborted
Nuclear Power Trio (live debut)
Inferi
Of Feather and Bone
Clusterfux
Sunday, June 14th:
Cattle Decapitation
Allegaeon
The Zenith Passage
Cephalic Carnage
In the Company of Serpents
Necropanther
