Lyons Peak, Mountain summit in San Diego County, US

Lyons Peak is a mountain summit located in the Cleveland National Forest in San Diego County, rising to approximately 3,741 feet at its highest point. An old fire lookout tower stands at the peak, built during the era when watchtowers were used to monitor forest fires.

The peak was named in honor of Captain Nathaniel Lyon, who explored this region in 1851 while searching for desert routes through California. This expedition was part of the early efforts to map and understand the area's geography.

The name Lyons Peak honours Nathaniel Lyon (1818–1861), who crossed the area as an army captain in 1851 while scouting a new route east to the desert. The summit lies inside an almost rectangular patch of Cleveland National Forest, and a fire lookout tower has stood there since 1913.

The area sits on restricted land within the Cleveland National Forest, and visitors need special permission to enter. It is best to contact the relevant forest management authorities in advance to understand access requirements.

The summit lies inside an almost rectangular patch of Cleveland National Forest, completely surrounded by private land, so there is no public access. Nathaniel Lyon, then an army captain, passed the peak in 1851 while scouting a route east to the desert; the mountain was later named for him.