The park entrance fee costs $7.00 per adult (age 16 or older) and is good for 7 days. The park is always free for kids and pass-holders, and is valid for seven days. Want to get a jump on your entrance fee? Buy online at pay.gov.
Some National Park Service locations have no entrance fee and there are often dates during the year when all park sites system wide go fee free. Check out fee free days at parks near you!