This free event has ended, but find upcoming FreebiEvents here. Celebrate National Public Lands Day with free entrance to the National Parks on September 27. 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.