The two least popular approaches originate from Sunol Regional Wilderness and Ed R. Levin County Park in Milpitas. The Sunol route climbs over five miles (8 km), a gentler grade than Hidden Valley Trail which climbs over three miles (5 km). The Levin County Park route first climbs from the Park HQ to Monument Peak over three miles (5 km), and from there Mission Peak is another three miles (5 km) to the north along a mostly flat trail. This route passes beside Mount Allison, the tallest of the three peaks. Mount Allison is about higher than Mission Peak, but not open to the public. Monument Peak is .