July: Going-to-the-Sun Road is typically fully open by July, alpine meadows bloom, and the high trails like the Highline and Grinnell Glacier melt out.
August: All of the high trails are open, Many Glacier's lakes are warmest, and huckleberries ripen (bears love them too).
Permits and reservations
No vehicle reservation is needed anywhere in the park in 2026. Instead, Glacier is trying ticketed Logan Pass shuttles and time-limited parking at Logan Pass.
Logan Pass shuttle ticket: Tickets release 60 days ahead at 8 a.m. MDT (rolling, starting May 2, 2026). The remaining tickets release at 7 p.m. MDT the night before.
Logan Pass parking: Logan Pass has time-limited parking in 2026. If you want longer in the alpine area, take the ticketed Logan Pass shuttle (it replaced the old first-come shuttle).
Wilderness camping permit: A wilderness use permit is required to camp in the backcountry.
Campgrounds: Some campgrounds take reservations and others are first come, first served. Check the park's camping page for the one you want.