Keystone Resort is the largest ski resort in Summit County located in Keystone, Colorado, United States. and owned and operated by Vail Resorts. It consists of three mountains – Dercum Mountain, North Peak, the Outback – and five Bowls (Independence, Erickson, Bergman, North and South Bowls) offering skiing at all levels. The three mountains are connected by a series of ski lifts and gondolas. Collectively, they form the largest operation in Colorado to offer night skiing (trails are lit by floodlights, with lift operation until late into the night). Night skiing takes place after sunset until as late as 9 p.m. on as many as 15 of the resort's trails.