Located in Big Arm, MT, we offer sailing lessons, sailboat rentals, captained charters, and guided kayak tours for all skill levels. Go Sail Flathead Lake offers lessons, rentals( sailboat, kayak and paddle boards ), and Captain charters to Wildhorse Horse Island State Park 7 days a week May, Memorial Day weekend to mid-September. The founder Captain Genevieve is originally from Montana and started Go Sail Flathead Lake in 2016 as a sailing school to share her passion for sailing and teaching. Dayton Yacht Harbor Dayton Montana Flathead Lake in Northwest Montana is 28 miles long, 15 miles wide and bordered by the beautiful Mission Mountains. The Largest freshwater lake west of the Mississippi. Located just 20 minutes from Kalispell, Montana and a short hour from Glacier National Park, Flathead Lake offers predictable winds for amazing sailing experiences. Flathead Lake is simply a sailor’s dream!