It has a high topographic prominence to height ratio and consequently commands a good all round view.

Beinn Mhòr is most frequently and probably most easily ascended from the south, via the end of the public road into Glen Massan.

From here, there is a short hike to Glen Massan, followed by about 400 metres of ascent up forestry tracks and paths, from which the climber eventually emerges onto the open hillside.

Despite the lack of paths, the upper slopes are gentle and mostly short grass which provide easy ascent to the summit.

An alternative longer route ascends from the car park of Benmore Botanic Garden, with a track leading up to the steep grassy slopes of A' Cruach and the secondary tops of Creachan Beag and Creachan Mòr to a wide shoulder leading to the summit of Beinn Mhòr itself.