Beinn a' Chuallaich is usually ascended from the south or the east. From the south there are routes from Kinloch Rannoch and Drumglas. From Kinloch Rannoch the route goes up the Allt Mòr, passing a fine waterfall before going steep up to the summit ridge. The route from Drumglas is the most direct and utilises the SE ridge. An approach from the east starts from the B847 road at grid reference and goes past a bothy and a deer fence before going steeply up to climb Coire Odhar and reach the summit.