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Most national parks do not charge admission on any given day, however some do.
Note -- if the park is under contracted management, they have the option to skip the free offer
Mark your calendar for these fee-free days in 2013:
April 22-26
five days during National Park Week
August 25
National Park Service Birthday
September 28
National Public Lands Day
November 9-11
Veterans Day weekend
Fee waiver includes: entrance fees, commercial tour fees, and transportation entrance fees. Other fees such as reservation, camping, tours, concession and fees collected by third parties are not included unless stated otherwise.
Go here to check out parks across the nation.