In April 2012, Mathieu Brown and Zach Harrison climbed a five-pitch, “stellar and demanding” route up the southeast face of Zoroaster, the well-known formation near the bottom of the Grand Canyon. The new route (520’, III 5.10 C1) ascends a large corner/ramp at the south end of the face on mostly good rock. The first-ascent party used aid on pitches two through four. Two protection bolts were placed. In April 2013, Harrison and Alwyne Butler returned to Zoroaster to attempt an all-free ascent. They freed the second and fourth pitches, at 5.11 and 5.11+, respectively. However, the third pitch still required two clean-aid moves.
From information supplied by Zach Harrison