Coláiste Iognáid Mountaineering Club has roughly fifty members and has been a feature of the school since the mid-1980s. It caters for boys and girls in all years and normally goes on an outing once a month. These are normally day trips to Connemara or the Burren on a Sunday or an overnight trip on one or two Fridays of the school year.

One of the school buses is used and a typical group would be fifteen including two or more teachers. The emphasis is on healthy exercise, having fun and a love of the outdoors.