The reservation has about of old-growth forest, most of which is found on the east side of Mount Everett. The forest contains eastern hemlock, eastern white pine, and hardwoods such as sugar and red maple, white and northern red oak, American beech, and sweet and yellow birch. Old-growth forest with a similar composition occurs around Guilder Pond. Mount Everett's summit supports a dwarf forest of pitch pine and bear oak that, aside from clearing for a fire tower and trails, has not been disturbed for centuries.