How to Visit the National Parks for Free in 2021 AFAR 12/30/2020 AFAR Editors Photo by Josh Carter on Unsplash Yosemite National Park is one of the many parks that will be free during certain days this year.Mark your calendars, budget travelers: The National Park Service announced its “entrance-fee free” dates for 2021. On these days, the more than 100 park sites that normally charge visitors to get in will offer complimentary admission to everyone. In total, there are six free days throughout the year. In 2021, you can visit U.S. national parks for no fee on these dates: January 18: Martin Luther King Jr. Day