The main peak in the area at the head of 21 mile creek, and northeast of the Callaghan Creek drainage. It is most often climbed from Whistler area via the Rainbow Lake trail. Can be done on skis, but one corner can be tricky in whiteout. Can also be approached from Callaghan Creek Valley via the Madeley Lakes Trail.
The Rainbow Icefall can be seen clearly from Whistler Village and White Gold, very often shining with blue light when the sky is overcast (as with Armchair Glacier on the other side of the valley, which can be seen from Alpine Meadows and Emerald Estates). The lower slopes of Rainbow near Green Lake were the site of one of the first small ski operations in the Green Lake-Alta Lake area, and the baselodge there, Rainbow Lodge, remained in business for many years as a local bar even after the rope tow ceased operations.
Climbing routes are listed counterclockwise, starting from the north.