We vow to enter 2018 with only positive thoughts, including this one: The National Park Service (NPS) will offer free entry into all national parks (well, the 118 out of the 417 that usually even charge a fee) on the following dates:
January 15, 2018: Martin Luther King, Jr. Day
April 21, 2018: National Park Week kicks off
September 22, 2018: National Public Lands Day
November 11, 2018: Veterans Day
We do have to point out that, in 2017, the NPS granted ten free-fee days—a fact that makes next year's offerings look significantly less generous.
We will, of course, take what we can get, and we suggest you do the same. Check out our list of the best national parks in the U.S. and start planning your next (potentially free) visit.