Middle Sister had seven glaciers, four of which were named. Going clockwise around the peak from the south aspect, these are:
The extent of glaciers on Middle Sister is based on photographs from the 1950s. Lower at left is a satellite image from September 2021 showing the current extent of ice.
Only Hayden and Diller Glaciers remain as active ice bodies on Middle Sister. In recent decades, Renfrew Glacier thinned to the point of breaking up into several smaller glaciers, all of which have now stagnated in the last few years, making it no longer a glacier.
Irving, South Irving, Camp and Chambers glaciers were all located on the south side of the volcano in the Chambers/Camp Lakes region. They are now all stagnant ice or gone.