Northern Highline Trail

Northern Highline is an 11.9-mile, one-way route from Granite Park Chalet to Fifty Mountain Backcountry Campground, crossing Glacier's remote high country. It is separate from the famous Highline Trail between Logan Pass and the chalet; starting at Logan Pass adds that approach. Choose this when you already have a multi-day backcountry itinerary and want to continue north beyond Granite Park. It is not a loop or a road-to-road day hike. Budget eight to ten hours for this segment, including breaks, and plan the next leg before you start.

From Granite Park Chalet, continue north. About 0.2 mile beyond the chalet, turn left at the Swiftcurrent Pass Trail junction; at the Granite Park Campground junction, stay right. The route then threads across open slopes beneath Ahern Peak. These junctions matter: following the Highline south returns toward Logan Pass, while the Waterton Valley Trail continues beyond Fifty Mountain.

About a mile before Ahern Pass, the trail crosses the north-facing Ahern Drift. Snow can linger there into August, and it may be icy early or late in the day. A short spur at the pass looks across Helen Lake and Elizabeth Lake toward Pinnacle Wall. From there, the main route drops about 600 feet to Cattle Queen Creek, its low point, then climbs roughly 2,000 feet over about three miles. This sustained climb is the hardest stretch; snow around the drainage can make footing slower.

After the climb, a short spur reaches Sue Lake Overlook, about 7,700 feet up, with Sue Lake below and Cathedral Peak, Mount Kipp and Pyramid Peak on the skyline. The route then descends roughly 750 feet in a mile to Fifty Mountain campground. The campground sits on an alpine shelf with broad views across the Livingston and Lewis ranges. Just after snowmelt, Glacier lilies spread through the meadow. The 1998 Flattop Mountain Fire burned the campground's forest; remnants of subalpine fir and an unfinished stone hiker shelter remain near the meadow's north end.

There is no parking at either end. Reach Granite Park Chalet on foot from Logan Pass or The Loop, then arrange a wilderness itinerary beyond Fifty Mountain rather than counting on a vehicle pickup. Overnighting at the campground requires a wilderness camping permit. Its five sites have a pit toilet, food-preparation area and food hang, but no food service was found, so bring your meals. Pets are not allowed on park trails or in the backcountry. High-country snow and water hazards usually ease by August, but storms can bring them back; check trail and campground status close to your trip.