The three defendants entered their pleas during a hearing before U.S. Magistrate Judge Mark Carman at the Yellowstone Justice Center in Mammoth Hot Springs on Thursday.
Four of the High on Life group were originally charged with disorderly conduct by creating a hazardous condition and foot travel in a thermal area in Yellowstone.
The attorney for the High on Life defendants and federal prosecutors want to settle all the charges against the defendants in federal court in Mammoth Hot Springs.