Annual Free Entrance Days: Check the schedule for National Park Service's annual free entrance days.
Local Promotions or Events: Some national parks collaborate with local businesses or organizations to offer free.
Educational or Scientific Research Visits: Individuals engaging in specific educational or scientific research may qualify for fee waivers.
Volunteer Opportunities: Some programs offer free access or reduced fees as a token of appreciation for volunteers' contributions.
Military Passes: Members of the U.S. military, including veterans and Gold Star families, may be eligible for free annual passes.
Senior Pass: U.S. citizens and permanent residents aged 62 and older can obtain a Senior Pass for a one-time fee, granting lifetime access to national parks.