This was a hell of a year, leaving many of us scrambling to unwind in one of the country’s treasured natural places. If you’re looking to get outside without dropping cash at the entrance station (which can cost as much as $35 per car, depending on the park), you’re in luck. We’ve compiled a list of all the days the national parks are free in 2021, with tips on how you can get involved and celebrate during these park-centric holidays. January Martin Luther King Jr.’s Birthday Dr. King’s legacy in the parks system was cemented when he delivered his famous “I Have a Dream” speech atop the steps of the Lincoln Memorial in 1963, flanked by rangers and throngs of supporters. These days his birth home and childhood neighborhood in Atlanta are a designated national historical park, and the 45-mile-long path of the voting rights march of 1965 was appointed as the Selma to Montgomery National Historic Trail. Celebrated on the third Monday in January, this National Park Service holiday is also designated as a day of service, with abundant parks-related volunteer opportunities.