Killington's summit reaches 4,241 feet, dropping roughly 3,080 vertical feet to a base at 1,165 feet across 155 runs spread over 1,509 acres near Killington, Vermont. Terrain splits 40 per cent intermediate, 28 per cent advanced, 17 per cent beginner and 15 per cent expert, with average annual snowfall of roughly 250 inches. The resort carries Ikon Pass affiliation. Twenty-one lifts, including ten quad chairs and three gondolas, serve the mountain alongside one double chair, one six-person chair, two triple chairs, three surface lifts and one t-bar.

Killington holds the title of the largest ski resort in Eastern North America, spread across six connected peaks, and markets the longest ski season in the East, a combination that has earned it the enduring nickname the Beast of the East. This considerable scale, paired with a long tradition of skiing innovation, has made Killington one of the most significant resorts in Northeast skiing.

In 1954, 24-year-old ski enthusiast Preston Leete Smith approached Vermont state forester Perry Merrill about leasing state land on Killington Peak to develop what he called Killington Basin. Smith spent nearly four years amassing investor funding, eventually forming the Sherburne Corporation and raising 127,500 US dollars through stock sales at 250 US dollars a share, and Killington opened on 13 December 1958. Under Smith's leadership, the resort pioneered numerous industry innovations, including the ticket wicket, extending the season to six months by opening earlier and closing later, novice terrain served by chairlifts, and early snowmaking installations during the 1960s.

In 1984, the Sherburne Corporation restructured as S-K-I Limited, which also owned Sunday River in Maine and Mount Snow in Vermont, before Les Otten's American Skiing Company took over and listed on the New York Stock Exchange in 1997. Financial difficulties led Killington to become privately owned under Powdr Corp in 2007, and in August 2024 a group of local investors, including Killington homeowners Phill Gross and Michael Ferri, acquired controlling interest in Killington and neighbouring Pico Mountain from Powdr. Adult daily tickets run from 129 to 219 US dollars.