[citation needed] The IMC was founded in 1942 by Bill Perrott and a group of other climbers in south Dublin, within easy reach of Dalkey Quarry.
[citation needed] In 1948, the IMC was revived on a more formal basis by Perrott, Joss Lynam, and others, with the intention that it become a national club drawing its membership from all around Ireland, with local branches in the major cities.
In 1957, with the aid of a grant from the Guinness brewing company, the club purchased a farmhouse at Glendasan, near Glendalough, County Wicklow, and converted it into a mountain hut, to be run by the Dublin section.
Later another hut (called the "Bloat House") was established in the Annalong valley in the Mourne Mountains in County Down; this was to be run by the Belfast section.
[citation needed] In the spring, the climbing season starts with the long-standing (since 1966) annual rock-climbing beginners' course conducted by experienced club members in Dalkey Quarry and Glendalough.