First called Mount Pete for Pete Chorak, an early Enumclaw settler, Pete became misheard as Peak, and the name Mount Peak received some followers. A former fire lookout built on the summit was called the Pinnacle Peak Lookout, hence the name Pinnacle Peak emerged. The one mile trail on the north side of Pinnacle Peak is called the Cal Magnusson Trail for a long time Cascade mountaineer who worked at REI for 25 years with famed American mountain climber Jim Whittaker.