The western, eastern and northern flanks of Hoodoo Mountain are covered by two valley glaciers known as the Hoodoo and Twin glaciers, while Hoodoo's southern flank, which extends down to the floodplain of the Iskut River, is free from glacial ice. Hoodoo Glacier on the volcano's western flank extends at the head of the Hoodoo River, while the Twin Glacier on Hoodoo's northern and eastern flanks lies at the headwaters of the Twin River. In the past, Hoodoo Mountain has been covered by glacial ice more than thick.