until TUE 9:00 AM MST, North Phoenix/Glendale, Gila River Valley, Central Phoenix, Northwest Pinal County, Scottsdale/Paradise Valley, Deer Valley, South Mountain/Ahwatukee, West Pinal County, Southeast Yuma County, Southeast Valley/Queen Creek, Tonopah Desert, Buckeye/Avondale, Sonoran Desert Natl Monument, Gila Bend, Northwest Valley, East Valley, Tohono O'odham Nation including Sells, Western Pima County including Ajo/Organ Pipe Cactus National Monument, Southeast Pinal County including Kearny/Mammoth/Oracle, Tucson Metro Area including Tucson/Green Valley/Marana/Vail, South Central Pinal County including Eloy/Picacho Peak State Park

until WED 5:00 PM MST, Lake Mead National Recreation Area, Lake Havasu and Fort Mohave

Grand Canyon admission fees waived

The National Park Service is celebrating its 99th birthday on Tuesday and they are giving you a present.

Posted August 25, 2015 6:08am MST

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