Info below directly from: http://www.nps.gov/findapark/feefreeparks.htm
Free Entrance Days in the National Parks
America's Best Idea - the national parks - gets even better with several fee-free days at more than 100 national parks that usually charge entrance fees.*
Mark your calendar for these fee-free dates in 2012:
- January 14-16
Martin Luther King Jr. weekend
- April 21-29
National Park Week
- June 9
Get Outdoors Day
- September 29
National Public Lands Day
- November 10-12
Veterans Day weekend
Here's a tip - many of your 397 national parks NEVER charge an entrance fee. So start Planning Your Visit!
*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.