July: The park highway is usually fully open by July, and the Lassen Peak trail melts out for a summit of a volcano that last erupted in 1917. Bumpass Hell's boiling mud pots come into view.
Permits and reservations
We found no entry reservation or timed entry system.
Wilderness permits: Required for backcountry camping (not for day hiking or established campgrounds). Available only online through Recreation.gov, up to 90 days before your start date. They are not sold in person or mailed.
Campgrounds: Reservations are required for all campgrounds except Juniper Lake and Southwest Walk-in.