Mount Lassen is a high mountain pass at an elevation of 8,511ft (2.438m) above the sea level, located in the Lassen Volcanic National Park, in California, USA.
The pass, also known as Lassen Peak, is traversed by the asphalted Lassen National Park Highway, part of the California State Route 89 built in 1926. The road over the pass is closed in winters. Clearing of the main park road (30 miles total), begins in April and on average takes 2 months before the road opens through. The road is not recommended for vehicles longer than 45 feet in total length.