The most direct route is from one of the roads to the south, such as from around A (Q7588 0413). Ascend more or less north along the rocky southern spur of the Castle Hill. There are a series of outcrops on this ridge which, with imagination, look like fortifications. As of 2012 the heather here is relatively low and probably has been burnt within the last few years. Allow around 2.5 hours for the round trip which is of around 7km.

A route from the east is to start at Quarry Hill car park B (Q83642 07816) with room for many cars. Walk uphill and west on a track initially. After passing the deflector station the track runs out. Walk the long, but easy, ridge with a drop to the south at its end for Castle hill.

Attractions of the summit include views over Castlemaine Harbour (the inner recess of Dingle Bay) and on the other side the fields, coast and hedgerows just NW of Killorglin. Linkback: mountainviews.ie/summit/276/comment/5036/