Philmont is located in the Sangre de Cristo Range of the Rocky Mountains of New Mexico. The closest town is Cimarron, New Mexico, but perhaps it is better to say that it is about 20 miles west-northwest of Springer, New Mexico, or 35 miles southwest of Raton, New Mexico. It is shaped somewhat like the letter 'I,' with the bottom section larger than the top. It is about 12 miles across (east to west) at its widest point, and about 30 miles long. There are no mountains to the south of Philmont, or to the east (indeed, part of the eastern fringe of the ranch is flatland) but the interior is quite mountainous.
The lowest elevation is 6500 feet, at the southeast corner. The highest point is the peak of Baldy Mountain (12,441 feet), on the northwest boundary. The most recognizable landmark at Philmont is the Tooth of Time (9003 feet), a granite monolith protruding 500 vertical feet from an east-west ridge. Tooth of Time Ridge, and the latitude line it sits on, mark the boundary between the central and southern sections of Philmont. The boundary between the central and northern sections is the narrowest part of the 'I'-shape, only a few miles across. U.S. Highway 64 runs through Philmont just south of this line.
