据美国旅游界消息： 2015年，美国国家公园将在以下规定时间段内免收门票费用：
1月19日 Martin Luther King Jr. Day
2月14-16日 Presidents Day weekend
4月18-19日 Opening weekend of National Park Week
8月25日 National Park Service Birthday
9月26日 National Public Lands Day
11月11日 Veterans Day
133个平时收费的国家公园将免门票开放。这些国家公园包括：
阿拉斯加：
Denali National Park and Preserve
亚利桑那州
Casa Grande Ruins National Monument
Chiricahua National Monument
Glen Canyon National Recreation Area
Grand Canyon National Park
Lake Mead National Recreation Area
Montezuma Castle National Monument
Organ Pipe Cactus National Monument
Petrified Forest National Park
Pipe Spring National Monument
Saguaro National Park
Sunset Crater Volcano National Monument
Tonto National Monument
Tumacacori National Historical Park
Tuzigoot National Monument
Walnut Canyon National Monument
Wupatki National Monument
阿肯色州
Fort Smith National Historic Site
Pea Ridge National Military Park
加利福尼亚州
Cabrillo National Monument
Death Valley National Park
Joshua Tree National Park
Lassen Volcanic National Park
Lava Beds National Monument
Muir Woods National Monument
Pinnacles National Monument
Sequoia National Park
Whiskeytown National Recreation Area
Yosemite National Park
科罗拉多州
Black Canyon of the Gunnison National Park
Colorado National Monument
Dinosaur National Monument
Florissant Fossil Beds National Monument
Great Sand Dunes National Park and Preserve
Hovenweep National Monument
Mesa Verde National Park
Rocky Mountain National Park
佛罗里达
Canaveral National Seashore
Castillo de San Marcos National Monument
Dry Tortugas National Park
Everglades National Park
Gulf Islands National Seashore
佐治亚州
Chattahoochee River National Recreation Area
Chickamauga and Chattanooga National Military Park
Cumberland Island National Seashore
Fort Frederica National Monument
Fort Pulaski National Monument
夏威夷
Haleakalā National Park
Hawai’i Volcanoes National Park
Pu’uhonua o Hōnaunau National Historical Park
爱达荷州
Craters of the Moon National Monument
Yellowstone National Park
印第安纳州
Lincoln Boyhood National Memorial
缅因州
Acadia National Park
马里兰州
Antietam National Battlefield
Assateague Island National Seashore
Chesapeake and Ohio Canal National Historical Park
Fort McHenry NM and Historic Shrine National Monument
Fort Washington Park
Harpers Ferry National Historical Park
马萨诸塞州
Adams National Historical Park
Cape Cod National Seashore
密歇根州
Sleeping Bear Dunes National Lakeshore
明尼苏达州
Pipestone National Monument
密西西比州
Gulf Islands National Seashore
Vicksburg National Military Park
密苏里州
Harry S Truman National Historic Site
Jefferson National Expansion Memorial
Wilson’s Creek National Battlefield
蒙大拿州
Bighorn Canyon National Recreation Area
Glacier National Park
Little Bighorn Battlefield National Monument
Yellowstone National Park
内布拉斯加州
Scotts Bluff National Monument
内华达州
Death Valley National Park
Lake Mead National Recreation Area
新罕布什尔州
Saint-Gaudens National Historic Site
新泽西州
Thomas Edison National Historical Park
Morristown National Historical Park
新墨西哥州
Aztec Ruins National Monument
Bandelier National Monument
Capulin Volcano National Monument
Carlsbad Caverns National Park
Chaco Culture National Historical Park
El Morro National Monument
Fort Union National Monument
Gila Cliff Dwellings National Monument
Pecos National Historical Park
White Sands National Monument
纽约州
Eleanor Roosevelt National Historic Site
Home of Franklin D. Roosevelt National Historic Site
Martin Van Buren National Historic Site
Sagamore Hill National Historic Site
Saratoga National Historical Park
Vanderbilt Mansion National Historic Site
北卡罗来纳州
Wright Brothers National Memorial
北达科他州
Theodore Roosevelt National Park
俄亥俄州
James A. Garfield National Historic Site
Perry’s Victory and International Peace Memorial National Memorial
俄克拉荷马
Fort Smith National Historic Site
俄勒冈州
Crater Lake National Park
Lewis & Clark National Historical Park
宾夕法尼亚州
Allegheny Portage Railroad National Historic Site
Fort Necessity National Battlefield
Johnstown Flood National Memorial
Steamtown National Historic Site
Puerto Rico
San Juan National Historic Site
南卡罗来纳州
Fort Sumter National Monument
南达科塔
Badlands National Park
Jewel Cave National Monument
田纳西州
Chickamauga and Chattanooga National Military Park
德克萨斯州
Big Bend National Park
Fort Davis National Historic Site
Guadalupe Mountains National Park
Padre Island National Seashore
犹他州
Arches National Park
Bryce Canyon National Park
Canyonlands National Park
Capitol Reef National Park
Cedar Breaks National Monument
Dinosaur National Monument
Glen Canyon National Recreation Area
Golden Spike National Historic Site
Hovenweep National Monument
Natural Bridges National Monument
Zion National Park
维尔京群岛
Christiansted National Historic Site
弗吉尼亚州
Appomattox Court House National Historical Park
Assateague Island National Seashore
Colonial National Historical Park
George Washington Memorial Parkway’s Great Falls Park
Manassas National Battlefield Park
Petersburg National Battlefield
Prince William Forest Park
Shenandoah National Park
华盛顿
Fort Vancouver National Historic Site
Lewis & Clark National Historical Park
Mount Rainier National Park
Olympic National Park
Whitman Mission National Historic Site
西佛吉尼亚州
Harpers Ferry National Historical Park
怀俄明州
Bighorn Canyon National Recreation Area
Devils Tower National Monument
Fort Laramie National Historic Site
Grand Teton National Park
Yellowstone National Park