KEY POINTS
  • Visitors get free entry to all U.S. national park sites on April 20, when National Park Week kicks off.
  • Most sites typically don't have an admission fee but 108 of them do. They generally charge about $20 to $35 per vehicle.
  • A few parks require visitors make an online reservation in advance. Without it, they'd be denied entry on certain days and during peak times.
Grand Prismatic Spring, Yellowstone National Park on Aug. 8, 2020.

Visitors to national parks will get free admission on April 20 as the federal government waives entrance fees to commemorate the start of National Park Week.

National Park Week runs for nine days, from April 20 to April 28.