I did this in conjunction with Milk Hill, which made for an enjoyable 2.5 hr relatively easy walk. See Milk Hill page for starting point. From Milk Hill summit head SSW for about 1.8km, mostly over shortish heather and long grass, the terrain boggy in places. From the col the ascent to Blentasour is a mere 35m. Two substantial cairns mark the otherwise unremarkable summit area, although they are not actually on the highest point, which is about 50 metres or less to the east. From summit turn NW for about 1.5km until you reach the tree line and follow it until you reach the track to the west. Good views from Knockmealdowns and Comeraghs from top. Linkback: https://mountainviews.ie/summit/821/comment/21848/