Trịnh Thành 5 tháng 1 lúc 13:36 · These are the six entrance fee-free days in 2021. Keep these dates in mind to save some money during your next adventure in the great outdoors. 2021 National Park Free Days January 18: Martin Luther King, Jr. Day April 17: First Day of National Park Week August 4: One-year Anniversary of the Great American Outdoors Act August 25: National Park Service Birthday September 25: National Public Lands Day November 11: Veterans Day If you’re planning to visit several national parks this year, you might consider investing in an annual pass. With the America the Beautiful — The National Parks and Federal Recreational Lands annual pass, you can access hundreds of federal recreation sites for $80 a year. Certain groups even qualify for free annual passes, including current U.S. military members and their dependents, U.S. fourth graders, and U.S. citizens or permanent residents with permanent disabilities. Plus, U.S. citizens or perm...