St. Charles, Iowa will play host to 25,000 fans for its 11th year of Hinterland. 2026 displays an impressive variety with headliners Katseye, Lorde, Mumford and Sons, and Kali Uchis amongst a barrage of phenomenal supporting acts. Now expanded to a four-day festival at the Avenue of the Saints Amphitheater, here is your can’t miss acts at Hinterland 2026. Mumford and Sons There was a time when Mumford and Sons slowed down, but that time has ended long ago. Hinterland is a special festival in countless ways, but the camping portion excites me almost as much as the music.