You’ve missed this freebie, but you’ll find all of the Freebies here. Celebrate the National Park Service Birthday with free entrance to the National Parks on August 25. More than 100 national parks that usually charge admission will be free on this day. Did you know that 268 of the 401 national parks NEVER charge an entrance fee? If you are active duty military, you and your dependents qualify for the FREE Annual Pass program America the Beautiful National Parks and Federal Recreational Lands Pass.