That being said, in 2013 the National Park Service will be able to sponsor just 11 free days, down from 17 in 2012.
These will be:
- Martin Luther King Jr. Day: January 21
- National Parks Week: April 22 – 26
- Get Outdoors Day: June 8
- National Public Lands Day: September 28
- Veterans Day Weekend: November 9 – 11
According to a recent USA Today poll National Park visits will be the third most popular form of vacation in the US next year (after beach and lake vacations and road trips). With that in mind, it's good to remember that there are 398 parks in the system, of which only 133 charge entry fees. Of course, these are the most popular parks (Yellowstone, Yosemite, Grand Canyon, etc.).