The National Park Service is offering free admission on Tuesday, June 21 to more than 100 national parks that would typically charge you an entry fee. The National Park Service is doing this as a way to mark the first official day of summer which is recognized around the nation as June 21.
June 21 isn't the only day you can get into a national park for free though. Other fee-free days for this year include September 24, which is known as Public Lands Day, and November 11 through the 13, which is Veteran's Day weekend.
A full list of every national park that will be offering free admission can be found on the National Park Service website. This list includes many of the best-known parks in the country like Grand Canyon in Arizona, Yosemite and Muir Woods in California, Rocky Mountain in Colorado, Everglades in Florida, Yellowstone and Grand Teton in Wyoming, Acadia in Maine, Cape Cod in Massachusetts, Arches, Bryce and Zion in Utah and Shenandoah in Virginia.
Some of the concessions at the parks also offer deals on free-entry days. Swan Mountain Outfitters at the Glacier National Park in Montana are offering $5 off standard trail rates for kids that are riding with a full-paying adult, $5 off per rider on groups of 6 or more and $5 off for Montana residents on the first day of summer. Full details of all the deals are located here.
Source: MSNBC - Free admission to national parks on June 21