No entrance fee on Aug. 25 at state parks. And more free days are coming up this year at state and national parks.

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Go play for free in Washington’s state parks on Aug. 25. Visitors won’t need a Discover Pass to enjoy the parks on that Tuesday.

It’s one of the annual free days at state parks — there can be up to a dozen a year — when visitors don’t need a Discover Pass. The pass costs $10 for a day or $30 annually for visitors with vehicles who wish to use parking lots in state parks.

The Aug. 25 free day honors the 99th anniversary of the establishment of the National Park Service (on Aug. 25, 1916). National parks also will be free on Aug. 25 in honor of that anniversary.

Washington State Parks will have two more free days in 2015. They will be on Sept. 26 (in recognition of National Public Lands Day) and Nov. 11 (in honor of Veterans Day).

The National Park Service also will offer free-entrance days this year, on Sept. 26 and Nov. 11, including at popular national parks in Washington such as Mount Rainier and Olympic.