Access and parking is from T0952150139 A where perhaps half a dozen cars can park and you can walk up a forest road. Keep left at the first small and next larger junction T09425001 B in the forest roads. Follow the forest road until it stops then take a well trodden foot path through the trees. This will bring you progressively nearer. When you are about 140m away (SE of the top) you should see a small sign for "Walk 1" - this takes you on a less defined steeply rising track mostly through mature trees.
The top doesn't have much of a view from the trig pillar.
Much of the wooded summit area and slopes leading up to it such as the west have been harvested and replanted. However the ground is, as of 2010, covered by briers and furze which is extremely difficult to push through. Stick to roads and paths which are perfectly feasible. A local man told me that there is a walk right around the summit and certainly there is an apparent continuation of the path to the summit leading NW which presumably joins up with forest roads.
The exposed rock on Carrigroe is some form of limestone.
Scene of rebel activity in the rebellion of 1798, an attack launched from here was one of the occasions that the rebels were initially successful. Linkback: https://mountainviews.ie/summit/1019/comment/4698/

Walked Carrigroe on Easter Sunday.Approached from carpark area T0952150139 A and followed sweeping track until it came to a junction.Take the smaller track to the left which will bring you through some forestry with white marks sprayed on the trees to guide you to the hidden summit with trig pillar. No views at the summit as it surrounded by trees but nice views on route to top.30 mins up and down no problem. Linkback: https://mountainviews.ie/summit/1019/comment/6317/

Ascended Carrigroe on Thursday 2/01/2014. Started at T0952150139 A, followed Dessie1`s excellent directions into the forest and saw a green sign with 1 on it. I followed in the direction it pointed towards into a lovely wooded area, easily negoitated between the mature trees and was looking for the white markers. I could spot none so after about two minutes walking I headed steeply uphill towards a large Limestone boulder and I spotted another Green sign with the number three on it sitting in a hollow of a tree. I kept going uphill and eventually came out into a small cllearing where I was able to follow the faint traces of a path to the Trig point. Retraced my steps back to the tree with Green sign 1 on it and found another broken sign with the number two on it. Even without the signs the route to the summit is fairly straighforward. Linkback: https://mountainviews.ie/summit/1019/comment/15299/