Mount San Antonio

Mount San Antonio
South face of Mt. San Antonio, seen above Upland, California
Highest point
Elevation	10,064 ft (3,068 m) The National Map of the United States[1]
Prominence	6,224 ft (1,897 m) ↓ Cajon Pass[2]
Isolation	42.52 mi (68.43 km) → San Bernardino Peak
Listing	US most prominent peaks 52nd California county high points 14th Three Saints Hundred Peaks Section[3]
Coordinates	34°17′20″N 117°38′48″W / 34.2888927°N 117.6467218°W / 34.2888927; -117.6467218[4]
Naming
Etymology	Saint Anthony of Padua
Geography
Mount San Antonio Location in California Show map of California Mount San Antonio Mount San Antonio (the United States) Show map of the United States
Location	Los Angeles / San Bernardino counties, California U.S.
Parent range	San Gabriel Mountains
Topo map	USGS Mount San Antonio
Geology
Mountain type	Granitic
Climbing
Easiest route	Ski lift to Baldy Notch, Devil's Backbone Trail (hike)

Mount San Antonio, commonly referred to as Mount Baldy or Old Baldy, is a 10,064 ft (3,068 m) summit in the San Gabriel Mountains on the border of Los Angeles and San Bernardino counties of California.^[4][5] Lying within the San Gabriel Mountains National Monument and Angeles National Forest, it is the high point of the range, the County of Los Angeles, and the Los Angeles metropolitan area.

Mount San Antonio's sometimes snow-capped peaks are visible on clear days and dominate the view of the Los Angeles Basin skyline. The peak and a subsidiary one to the west form a double summit of a steep-sided east–west ridge. The summit is accessible via a number of connecting ridges along hiking trails from the north, east, south, and southwest.