nps.gov/grsa. Great Sand Dunes National Park and Preserve spans over 30 miles and contains over 5 billion cubic meters of sand to create the largest sandbox in North America. Nestled in southern Colorado, this park features North America's tallest dunes, rising over 750 feet high against the rugged Sangre de Cristo Mountains.. Great Sand Dunes National Park is home to the tallest sand dune in North America. If you're feeling ambitious, hike to the 750-foot summit. If the five-hour round trip feels like too big of an undertaking, don't fear! Hike to the unnamed dune that appears tallest from the parking lot and get a spectacular view of the area in a shorter time.

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The 2.7-mile trail begins in the Pinyon Flats Campground and travels to the top of an 8,700-foot viewpoint, overlooking the surrounding dunes and mountains. Dunes Overlook Trail is a great way to enjoy the beautiful landscape in the park without hiking the dunes. Upper Sand Creek Lake Trail. Length: 7.4 miles.. Between 2000 and 2004, the Great Sand Dunes National Monument was given National Park and Preserve status, and it remains one of Southwest Colorado's most beloved natural attractions even today. Learn more about how the sand dunes were formed here. Things To Do. The Great Sand Dunes National Park is open 24 hours a day, 365 days a year.