Schedule for National Parks Free Admission Weekends during 2010
The National Park Service entrance fees will also be waived on August 14 & 15, September 25, and November 11, 2010. Fees for activities such as camping, reservations, tours, or concessions are not affected by the entrance fee waiver.
There are 147 parks that normally charge entrance fees ranging from $3 to $25. The other 245 national parks do not charge entrance fees, so you can plan inexpensive visits year round!