Mount Aspiring and the Bonar Glacier is usually reached from Pearl Flat.
Via the West Matukituki http://www.doc.govt.nz/parks-and-recreation/tracks-and-walks/otago/wanak...
Bevan Col accesses Colin Todd Hut, which can be used as a base for the North Buttress, North West Ridge, South West Ridge and the Haast Range.
‡ Note. In winter or early spring it is recommended to use the French Ridge access routes to get to the Bonar Glacier. After the spring avalanche cycle, or when the Quarterdeck becomes impassable, use the Bevan Col route.