|Cruach Ardrain is a very craggy "Y" shaped mountain with two parallel long ridges running NW towards Crianlarich either of which can be used for access. |
The more W of the two NW ridges is the normal access route from the track in Coire Earb to Grey Height (685m) then SE to ascend the W face of the mountain, or more usually onto the SW ridge for an easier ascent.
It is not recommended that you approach Coire Ardain through commercial pine forest to the MW as this takes you onto very muddy paths.
The more E of the NW ridges can be accessed from the path in Benmore Glen to the E, however, this route is very steep in places and not recommended. A third ridge runs SE to Beinn Tuliachean with a spur SW to the very craggy Stob Glas (815m).