Swimming at Lake Chelan is a popular activity, drawing visitors and locals to its crystal-clear waters, especially during the warm summer months. The lake, one of the deepest in the United States, stretches 50 miles through the scenic North Cascades and is known for its pristine beauty and refreshing temperatures. Swimming season at Lake Chelan typically runs from late June through early September, when air temperatures range from the mid-70s to the 90s (°F), and the lake has had time to warm up. Spring and fall swimming are possible but can be chilly, as the lake is fed by mountain snowmelt. Many hotels on the lake have swimming areas for guests. For public access to swimming areas on Lake Chelan, local and state parks are your best bet, with all parks along the lake boasting beaches and/or dedicated swimming areas.