No reservation is needed to enter the park. The park is cashless.
Inner canyon wilderness permit: Required to hike or climb below the rim on the South Rim routes (Tomichi, Gunnison, Warner). In 2026 reservations opened April 1 at 8 a.m. MT (for May 1–July 31) and July 1 at 8 a.m. MT (for Aug 1–Oct 31).
South Rim Campground: Reservations only, through Recreation.gov. East Portal and North Rim campsites are first come, first served.