Pacific Peak is the sharp, pyramidal summit in the heart of the Tenmile Range southwest of Breckenridge, and its long east ridge is a familiar sight from the slopes of Quandary Peak across McCullough Gulch. On its eastern shoulder sits Pacific Tarn, which holds the record as the nation's highest lake with an official name. Many hikers link it with Atlantic Peak and Crystal Peak in one long circuit.
The East Slopes route leaves the Spruce Creek trailhead and follows a well-marked trail past old mine buildings and tramway remains to the Mohawk Lakes, then climbs into the basin below Pacific, Crystal and Father Dyer. A steep gully of roughly 40 degrees leads to the flats near 13,400 feet and a short final ridge. Figure about 11 miles and 3,650 feet from the lower lot, or about 7 miles from the 4WD upper trailhead. From McCullough Gulch, the Southeast Slopes (7.75 miles, 3,000 feet) crosses talus toward the Atlantic saddle and a loose headwall. Scramblers have Class 3 options on the East Ridge and West Ridge. McCullough Gulch parking is managed in summer, with permits or a shuttle.
Every route here is difficult Class 2 or harder on loose rock with real rockfall potential, so a helmet and spacing in the gullies are wise. With snow, carry an axe and crampons. Summer brings wildflowers to the lake basins and far more solitude than Quandary sees.
