In 2014, U.S. national wildlife refuges will offer free admission to visitors on these days:
January 20: Martin Luther King Jr. Day
February 15-17: Presidents’ Day weekend
September 27: National Public Lands Day
October 12: The first day of National Wildlife Refuge Week
November 11: Veterans Day
The fee holiday is an annual inducement to visit public lands. National wildlife refuges are managed by the U.S. Fish and Wildlife Service, part of the Department of the Interior.
Of the nation’s 562 national wildlife refuges, 460 are open to the public. Of those, only 35 refuges charge an entrance fee, generally ranging from $3 to $5. Admission to the others is free. The entrance fee waiver does not cover concessionaire or license fees for some activities such as hunting, fishing or special tours.
Other federal land management agencies that will offer fee-free days in 2014 are: the National Park Service, the Bureau of Land Management, the Bureau of Reclamation, the U.S. Forest Service, and the Army Corps of Engineers.
source: U.S. Fish and Wildlife Service