The final opportunity this year to visit the National Parks free is this weekend – August 15-16, 2009.

Utah National Parks
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

Arizona National Parks
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

Idaho National Parks
Craters of the Moon National Monument
Yellowstone National Park

Find a National Park near you at THIS LINK.