Flathead Lake is the largest natural freshwater lake west of the Mississippi, and one of the most pristine in the country. At 28 miles long and up to 15 miles wide, it offers serious room to roam — from the charming town of Bigfork at the northeast corner to Polson at the south end, with Somers, Wild Horse Island, and dozens of hidden bays in between.

Sea Ray Power Boat Rental

The Flathead Lake Sea Ray boat rental is a full-day, self-guided rental in a premium Sea Ray power boat — built for speed, water sports, and a proper day out on the water. It comfortably fits 4–6 passengers, and you can add on a wakeboard, tube, double float tube, or party float. No boating license required — you just need a valid driver's license and to be 18+. Fuel is billed based on usage.

The full day gives you plenty of time to explore the lake at your own pace. Head north toward Bigfork for a meal on the water, cruise south toward Polson and the lake's outlet at the Flathead River, or drop anchor near Wild Horse Island State Park where bighorn sheep and wild horses roam the shoreline. The lake's clarity is legendary — on calm days you can see the rocky bottom dozens of feet below.

About Flathead Lake

Flathead Lake sits in the Flathead Valley between the Mission Mountains to the east and the Salish Mountains to the west. Its waters are fed by the Flathead River and stay remarkably clear year-round. Summer water temperatures are warm enough for swimming from July through August. The lake is best explored on a calm morning — afternoon winds can pick up from the south, so it's worth getting an early start.

Looking for more options on Flathead Lake? Flathead Lake Rentals in Polson offers pontoon and ski boats as well. And if you're interested in other water-based adventures in the area, check out rafting near Flathead Lake or explore the full boat rental options across Glacier Country.