| Armstrong Mountain | |
| Map: | New York Adirondack Park#USA |
| Elevation Ft: | 4400 |
| Elevation Ref: | [1] |
| Prominence Ft: | 98 |
| Prominence Ref: | --> |
| Listing: | Adirondack High Peaks 22nd[2] |
| Location: | Keene, Essex County, New York |
| Range: | Great Range |
| Coordinates: | 44.1348°N -73.849°W |
| Topo: | USGS Keene Valley |
| First Ascent: | 1875, by Ed Phelps and Thomas P. Wickes[3] |
| Easiest Route: | Hike |
Armstrong Mountain is a mountain in the Great Range of the Adirondacks in the U.S. state of New York. It is the 22nd-highest of the Adirondack High Peaks, with an elevation of 4400feet. It is located in the town of Keene in Essex County. The mountain is named for Thomas Armstrong, a lumberman from Plattsburgh. In 1866, Armstrong and a business partner, Almon Thomas, purchased the Totten and Crossfield Purchase, which contained the mountain and several of the other High Peaks. Armstrong named the mountain after himself in 1869, although the name was not popularized among local hikers until years later. The earliest recorded ascent was made by Ed Phelps and Thomas P. Wickes in 1875. In 1887, the Totten and Crossfield Purchase was sold to the Adirondack Mountain Reserve.
The mountain can be climbed via the Phelps Trail and ADK Range Trail. The Phelps Trail begins at the Garden Parking Lot in Keene Valley on New York State Route 73. The ADK Range Trail branches off at a DEC Interior Outpost located 3.1miles from the trailhead.[4] The trail continues to the Wolf Jaws Notch, located between Lower Wolfjaw Mountain and Upper Wolfjaw Mountain, and branches between the two. The trail to the right goes over Upper Wolfjaw and continues to the summit of Armstrong, 3.9miles from the DEC Interior Outpost, for a total one-way distance of 7miles and elevation gain of 2500feet. The summit offers views of Johns Brook Valley and the other peaks of the Great Range.[5] Alternatively, the summit can be approached from the Ausable Club on the Lake Road Trail and Beaver Meadow Trail,[6] or climbed as part of a hike of the complete Great Range.[7]