This section of the Great Divide Mountain Bike Route is entirely within Montana. The route begins at the border and quickly enters forested backcountry. It skirts the western border of Glacier National Park along North Fork Flathead River. The route goes through towns every 4-5 days for restocking supplies. You'll either be going over passes or riding through valleys en route to the next climb, and it's considered the most challenging portion of the entire route. You'll go through historic mining regions lying between Seeley Lake and Helena, Montana. Fascinating historic sites beckon in the state’s capital of Helena, so plan to lay over at least a day to catch them.

New to this edition of GDMBR maps is a spur route from Seeley Lake to Adventure Cycling’s hometown of Missoula. At just a hair over 65 miles, this is a challenging route through a maze of steep terrain on a mix of surfaces including overgrown old logging roads and singletrack trail.