The vast majority of Pfeifferhorn ascents are via Red Pine Canyon and across the class 3 knife edge ridge over Maybird Gulch. An interesting -- and arguably more impressive -- alternative is to directly ascend the Maybird headwall. This route is only attractive when there is snow. The slope maxes out around 40 degrees. The Pfeifferhorn's rotten Northeast face generates significant rockfall.
Starting at the White Pine trailhead, go to Maybird lake following the summer trail, or near it, and then head for Upper Maybird. From the upper bowl, there are plenty of interesting ways to get to the ridge, including some nice looking couloirs towards the East end of the headwall. We ascended as far West as possible while staying out of the main rockfall zone, reaching the ridge just at the base of the summit cone. From here, follow the standard route to the summit.
"Beware of all enterprises that require new clothes."
--Henry David Thoreau