Glacier National Park Ticketed Entry. In 2025, there are no more scheduled dates when a separate vehicle reservation is required to enter Glacier National Park. For the 2025 summer season, there were timed-entry ticket requirements for the west entrance of the Going-to-the-Sun Road from mid-June to late September. There were also restrictions for the Many Glacier entrance. Information about any park entry requirements for the 2026 summer season will be announced at a later time.