The usual way to get to the summit is to park at Clydagh bridge forest entrance R87450 27780 A ht137m, where there is parking on both sides of the road. Walk up the tarred road to a stile, R87796 27461 B ht189m(note: no dogs sign here), cross the stile and walk the rough track near the forest edge before crossing a wire fence via stile, R88590 27213 C ht358m and then on to the summit.
The summit (no cairn or marker)is a fantastic viewpoint for the glacier ravaged north face of the Galty range.
Many would use this as a start point for a fine circuit of Clydagh continuing on to Galtybeg,Galtymore and Slievecushnabinnia.
Cush can also be climbed from the directiion of Knockastakeen using Galty Waterworks as an access track, there are options to park on the road or in the small carpark(where you can also walk to Lough Muskry) at R91547 28065 D. Linkback: https://mountainviews.ie/summit/215/comment/4975/

Cush is the most northerly of the mountains in the Galtee range. As a viewing platform it affords great views of the northern, cliffy faces of Galtymore, Galtybeg and Greenane. (As usual in Ireland, it is the north facing side of the 500m mountains which have had the most wear from glacial action.) Our photo shows the summits of Galtybeg (left of centre) and Galtymore (to right). Beneath and to the left of Galtybeg is the corrie that contains Borheen Lough. To the right of Galtybeg you can just make out the lip of Lough Diheen, a little jewel in the side of the Galtees at 554m altitude. Linkback: https://mountainviews.ie/summit/215/comment/532/

I did this last Monday on a crystal clear winters day. I followed the directions for the Cush-Galtybeg-Galtymore-Slievecushnabinnia horseshoe as given in Lonely Planet’s Walking in Ireland. I parked at the car park near the Clydagh River bridge at R875278 E. Here you find a notice describing the history and geography of the Galtees and a welcome, if you don’t be smiling, from local landowners and the Glen of Aherlow failte society. But do note that dogs are prohibited. Ignore the two forest paths that lead from the car park and walk up the tarmac road for a few hundred yards until you see concrete steps on your left. Cross these, then cross a stile, then follow a rough path and fence up the side of Cush, until you reach a fence barring your way. There is a stile about 20 yards to your right to cross this, leaving you on open ground all the way to the summit. The ground is pleasant enough underfoot, but it is quite steep. All the way up great views are afforded of the Glen of Aherlow to your back. The summit has no cairn or pillar but has a very sharp drop off its western side which would need to be watched in bad visibility. The summit has two distinct peaks, the northernmost being the highest. After this it was off to tackle Galtybeg. Linkback: https://mountainviews.ie/summit/215/comment/2097/

Cush pictured from the South West (updated 2018). Cush is surrounded by forestry to its west, south and east however to the north (right of this picture) is a long col to Galtybeg. Linkback: https://mountainviews.ie/summit/215/comment/533/

Climbed Cush as part of a horseshoe walk taking in Galtybeg and Galtymore having started by turning off at Clydah brige(Ref 875 280 F OS sheet # 74) and parking the car at the first junction with forest tracks heading off to the left and right. The views towards the steep Northern face of the Galtees are well worth the climb although it is possible to skip Cush on this circuit by heading straight for the col between it and Galtybeg. Had one of those experiences that make it all worth while when dense cloud on the summit of Galymore cleared to grant me a few minutes of magnificent views while sipping my coffee !
The full circuit can be quite strenuous so allow between 5 and 6 hours to complete. Linkback: https://mountainviews.ie/summit/215/comment/1889/