Lassen Peak, or Mount Lassen, is a 10,457-foot lava dome volcano and highest peak in Lassen Volcanic National Park in Northern California. It is the southernmost active volcano in the Cascade Range of the Western United States. This is a steep, challenging climb from the parking lot at roughly 8,450 feet with fantastic panoramic views from the summit. Please be aware that this is still an active volcano so before you set out, be sure to check in with park officials!