The summit can be accessed from several directions: one route starts at Ogwen Cottage on the shores of Llyn Idwal and approaches the mountain from the north; another starts at Pen-y-Pass and approaches it from the south; another possibility is to approach it from the east along the ridge from Glyder Fach. Although there is much shattered stone near the summit of Glyder Fach, the ridge between the two summits is fairly level and easy going. A scrambling, circuit route encompasses the three summits of Tryfan, Glyder Fach and Glyder Fawr and takes six or seven hours. One of the most popular routes from Ogwen Cottage follows the shore of Llyn Idwal to the base of the famous Rhiwiau Caws (Idwal Slabs) rock climbing crag, it then makes its way out of the cwm via the steep Twll Du path, arriving at a small lake called Llyn Y Cŵn. From here a steep scree path ascends the western shoulder to the summit of Glyder Fawr.