A pleasantly situated crag with a fine collection of mid-grade trad routes. The rock is good quality and the popular climbs are distinctive in character. Cwm Penamnen is a peaceful backwater place; the crag classic, Laverado, has a certain amount of crowd-pulling fame, but the chances are you’ll have the cliff to yourself. The best routes are in the VS to E1 range; all are two pitch affairs.
In times past Carreg Alltrem served a different purpose - back in the 15th century the local warlord, Maredudd Ap Ifan is said to have used it as a look out post for his band of warriors.
The crag receives plenty of sunshine and, providing the sun is out, year round climbing is possible. That said, the best climbing conditions will normally be found outside of the winter season. The rock is quick-drying but one of the key routes, Penamnen Groove, is a drainage line and is likely to be damp after rain.
From the main road running through Dolwyddelan (A470), turn south towards the railway station. Cross the river and railway bridges, then turn immediately left. After 50m a track on the right leads into the forest. Park, if there is space, in the area adjacent to the gate. Walk along the track into the forest, taking the left fork at the first junction. The crag can be seen up on the left.