The park's interior and scenic road are only open to vehicles during the summer season, typically from mid-May to mid-September, due to snow and ice.
Accessible by ferry from late May through September due to Lake Superior's icy conditions during other times of the year.
Many roads and hiking trails are only fully accessible in summer due to heavy snowfall in winter and early spring.
High-elevation trails and roads are typically closed or inaccessible until late spring or early summer due to snow.
Many higher elevation trails and campsites are only accessible in summer due to snowpack.
Snow typically covers roads and trails at higher elevations during winter, with full access generally available from late June through October.
Most park roads and facilities are only fully accessible from late June to early October due to snow accumulation.