State Parks Discover Pass Free Days
Washington State Parks offers several "free days" when a Discover Pass is not required to visit a state park.
Following are 2015 free days:
April 4: Saturday Spring Day
April 22: Earth Day
May 10: Sunday Spring Day
June 6: National Trails Day
June 13: National Get Outdoors Day
Aug. 25: National Park Service Birthday
Sept. 26: National Public Lands Day
Nov. 11: Veterans Day
Please note, free days apply only to day use (not overnight stays or rented facilities). A Discover Pass is still required to access lands managed by the Washington state departments of Natural Resources and Fish & Wildlife on these days.
For more info. go here.