Do you need a permit to hike the Highline Trail in Glacier National Park?

For a day hike, no trail permit is needed. The 11.8-mile point-to-point from Logan Pass to The Loop is open to anyone who can get to the trailhead, and that last clause is the real constraint: a timed-entry vehicle reservation may be required for Going-to-the-Sun Road in peak season, and Logan Pass parking fills by 7:30 to 8am.

Overnight trips are a different story. Camping along the route requires a Glacier backcountry permit at $7 per person per night, and the park distributes about 70% of backcountry capacity through an advance lottery with applications in March, holding the remaining 30% for walk-ins. Group size for backcountry camping caps at 12.

Granite Park Chalet, the historic 1914 building at mile 7.6, is its own separate reservation. It has no running water, so a chalet night still means hauling or treating your own.

Two more planning notes. The trail only opens when Going-to-the-Sun Road does, typically late June, and snow can linger on the route into July. And this is prime grizzly country from the first mile, so bear spray on your hip, not in your pack, is standard practice regardless of whether you are out for a day or a week.