Fee-free days at U.S. National Parks in 2013 will be as follows:
Martin Luther King Day, Jan. 21;
National Park Week, April 22-26;
National Park Service Birthday, Aug. 26;
National Public Lands Day, Sept. 28;
Veterans Day weekend, Nov. 9-11.
The fee-free designation applies to entrance fees only and does not affect fees for camping, reservations, tours or other special uses. Park entrance stations will have interagency senior and annual passes available for purchase.