The Ski to Sea Race (S2S), widely known as the Ski to Sea, is a seven-legged, 93-mile (150 km) long, multi-event competition held on the Sunday of Memorial Day weekend in Whatcom County. The race starts on the ski slopes of Mount Baker Ski Area, and ends at Marine Park in Fairhaven, on the shore of Bellingham Bay. The seven legs of the race are: cross-country skiing, downhill skiing or snowboarding, running, road biking, canoeing, cyclo-cross biking, and finally kayaking. The Ski to Sea Race is managed by Whatcom Events, with a race committee that includes a race director, an operations assistant, one or two chairmen to oversee each event, a volunteer coordinator along with nearly 900 volunteers.

Bellingham is the county seat of Whatcom County in the U.S. state of Washington. It lies 21 miles (34 km) south of the U.S.–Canada border, between Vancouver, British Columbia, 52 miles (84 km) to the northwest and Seattle (90 miles to the south.