From the trailhead, walk up canyon to the east along the creek for 1/4 mile until the trail branches off to the south and onto the Mill B south trail proper. The trail is consistently quite steep as it crosses over a bridge and then switches back to climb out of the ravine.

From here it maintains a relatively straight line up the canyon without many switchbacks as it gains 2,700 vertical feet through aspen groves. There are a few switchbacks on the west side of the canyon before it pops out onto a rocky platform. The trail ends here at the three lakes that sit right at the foot of Sundial Peak creating a wonderful visual combination of natural beauty.