Mammoth Lakes' economy is primarily tourism-based. For example, Mammoth Mountain Ski Resort is the top ski destination in California. A 13% tax is added to the rental of any lodging facility and campgrounds for stays of less than a month. There are more than 4,599 rental units in Mammoth Lakes and the lodging industry generates around two-thirds of the gross revenue of the Town of Mammoth Lakes. As well as the pull from winter extreme sports, Mammoth Lakes also benefits greatly from tourism in the summer from people who visit to camp, hike and fish.