Lake Mary is about 0.75 miles from the Brighton Ski Resort parking area and trailhead. From Little Cottonwood Canyon, the trailhead begins near the Sunnyside parking area at the Catherine Pass trailhead, which is up a gravel road about 1.5 to 2 miles from the summer information booth. The hike from the Catherine Pass trailhead to Lake Catherine and Lake Mary is about 1.5–2 miles.