Donaldson Mountain rises to 4,140 feet as part of the Seward Range in the western High Peaks, a cluster of summits known for their remoteness. Named in 1924 for Alfred Lee Donaldson, author of A History of the Adirondacks, the peak was first ascended on October 14, 1870, by surveyor Verplanck Colvin and his guide Alvah Dunning during a mapping expedition. It ranks 33rd among the Adirondack High Peaks, sitting along a ridge flanked by Seward Mountain to the northeast and Mount Emmons to the south.
There is no maintained trail to the summit. The standard approach starts at the Coreys Road trailhead south of Saranac Lake, following the Ward Brook Truck Trail roughly five miles into the backcountry before herd paths branch toward the Seward ridge. An alternate route via the Calkins Brook Track Trail joins the same network. Most hikers combine Donaldson with Seward and Emmons in a single long day, covering close to 18 miles round-trip with map and compass navigation required throughout.
The summit is wooded with limited views, but the sense of deep wilderness is strong. The connecting ridge is notoriously wet and muddy, with steep slabs and exposed roots near the top. Spring conditions and periods after heavy rain can make travel especially difficult. Given the distance from the trailhead, the absence of trail markings, and the rugged terrain, the Seward Range is considered among the most demanding objectives in the 46.
