The trailhead is found by taking the dirt road signed "Packer's Roost" from the Going-to-the-Sun Road and following it to the buildings at the end.
From there, the level trail travels through a nice, airy forest with tall growth such as thimbleberry. The trail enters an old burn as the Granite Park - Flattop Mountain Connector
breaks off to the right. From here, filtered views of Heavens Peak and Flattop Mountain keep you company as you make your way through the stands of silver trees. The trail gently goes up and down and veers away from McDonald Creek.
Eventually, the trail crosses over Mineral Creek on a swinging bridge, then begins to switchback up Flattop Mountain, loosely following Flattop Creek. Keep an eye out on the cliffs on the other side of the creek for mountain goats. This portion heading up through the south face of the mountain is part of the old burn and offers little protection from the sun, so expect it to be hotter in the afternoon.
The trail comes near a waterfall, but not super close, before coming alongside the creek and paralleling it up the mountain as the terrain levels off. The trail then passes a campground and crosses through stands of burned trees and wonderful open meadows filled with a variety of birds as it gradually climbs. Mountains are now visible in all directions as this mountain is really an old meadow between the Lewis and Livingston ranges. The views are great as you reach the top of your climb, then drop down a bit and follow the Continental Divide, then work your way across meadows an up to the Fifty Mountain campground and join up with the Waterton Valley
Trail and the Highline Trail
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Thimbleberry and lush vegetation in the beginning leads to fireweed, globe mallow and aster, then glacier lily and other alpine flowers. Animals range from deer, black bear, squirrels and hares in the lower sections to grizzlies and mountain goats in the higher elevations. Birds are varied from chickadees, nuthatches, woodpeckers and grouse in the valley floor to finches, hawks, and other open meadow, alpine birds.