The more common trees and shrubs are western larch, western red cedar, Engelmann spruce, Douglas fir, western white pine, lodgepole pine, whitebark pine, limber pine, alpine fir, grand fir, quaking aspen, Rocky Mountain maple, and alder. When to Visit - Most people visit the wilderness between July 1 and October 1. Snow-filled passes and high streams make earlier travel difficult and hazardous. High lakes do not open up until early or mid-June. June is normally a wet month.
Snow still covers high, shaded basins and surrounds trees.
July, August, and early September are dry months. Daytime temperatures are the 80-90 degree range. Showers are frequent. Nights are very cool. Snow occur at any time.