A long, classic glacier climb to a summit famous for "the Cheval," a short, exposed rock traverse between Dome Peak's twin high points, and a popular stop on the Ptarmigan Traverse even though it is less often climbed as a standalone objective.
Drive the Suiattle River Road (Forest Road 26) about 19.5-20 miles from Highway 530 to the Downey Creek Trailhead (about 1,450 feet). Hike the Downey Creek Trail roughly 6.5 miles to its junction with the Bachelor Creek Trail, staying on the east bank of Downey Creek, then follow Bachelor Creek Trail — steeper, brushier, and with more blowdown — crossing to the creek's south side around 4,000-4,400 feet. Continue on climbers' tread through meadows to a saddle around 5,800 feet, then drop to Cub Lake (about 5,300-5,400 feet) for a base camp, or continue up onto Itswoot Ridge (around 6,200-6,300 feet) for a shorter summit day at the cost of a longer approach day. From high camp, cross the basin below Itswoot Ridge (well-cairned even in reduced visibility) and gain the Dome Glacier, which is generally mellow, to a col near the summit. From the col, scramble to the base of the final summit blocks and cross "the Cheval," a narrow, exposed rock traverse, to reach the true summit.
Descend the climbing route, re-crossing the Cheval and the Dome Glacier back to high camp; parties without much exposure tolerance sometimes set up a handline on the Cheval for the return crossing.