Great Sand Dunes National Park and Preserve

Great Sand Dunes National Park and Preserve contains a vast dunefield at the eastern edge of the San Luis Valley in south-central Colorado and includes the tallest sand dunes in North America. The highest dunes rise roughly 750 feet from the valley surface and sit below the Sangre de Cristo Mountains.

The site features a broad dunefield of windblown sand, active dune migration, and seasonal water on the dune front known as Medano Creek. Visitors hike, sandboard and scramble on the dunes, and many choose to wade along the creek when it is running.

The dunes formed as sand transported from river and mountain sources accumulated where prevailing winds drop load against the mountain front, and the landscape remains active with shifting sand and migrating ridges. The park includes both dune and backcountry preserve units to protect dune ecosystems and adjacent mountain habitats.

The park sits in the San Luis Valley at the eastern base of the Sangre de Cristo Range, near the small towns of the valley in south-central Colorado. The open valley and mountain backdrop create a dramatic context for the dunefield.

Tallest dunes in North America: Home to the tallest sand dunes in North America, with the largest dunes rising to about 750 feet above the valley floor.
Medano Creek seasonality: Medano Creek flows at the dunes' edge in spring and early summer, producing a shallow surf-like flow that is popular for wading and makes sand transport visible.

What to See #

Dunefield: The principal dunefield, a broad expanse of windblown sand that includes the park's tallest dunes and the prominent "Star Dune" rising above the surrounding plain.
Medano Creek: Medano Creek, a seasonal sand-flowing stream at the base of the dunes that runs in spring and early summer and creates a shallow wet beach used for play and sandboarding.
Visitor center and trailheads: A visitor center with exhibits about dune formation, natural history and safe access to the dunes, plus trailheads for nearby mountain and prairie walks.

Tips for Visiting Great Sand Dunes National Park and Preserve #

Plan your visit for early morning or late afternoon (sunset is especially dramatic) - the light makes the dunes' ripples photogenic and temperatures are far more comfortable.
Enter through the park's main gate off Highway 150 and stop at the visitor center to check current Medano Creek conditions; the seasonal creek is a major attraction and its flow changes rapidly with spring runoff.
Many visitors only climb the High Dune; if you want quieter sand, hike farther along the dune field or take the Mosca Pass trail to escape the busiest ridge near the main parking area.

Best Time to Visit Great Sand Dunes National Park and Preserve #

Visit in late spring or early fall to avoid the summer heat on the dunes and to enjoy comfortable hiking conditions.

Late spring / Early fall

May-Jun, Sep-Oct · 40-75°F (4-24°C)

Cooler days and comfortable nights make these shoulder periods ideal for hiking the dunes and nearby trails.

Summer

Jul-Aug · 60-90°F (16-32°C)

Dunes can be very hot in direct sun; visit early morning or late afternoon and expect more visitors near Medano Creek.

Winter

Nov-Mar · 0-45°F (-18-7°C)

Cold temperatures, possible snow on the dunes, and far fewer visitors - dramatic scenery but harsher conditions.

Weather & Climate near Great Sand Dunes National Park and Preserve #

Climate

Great Sand Dunes National Park and Preserve's climate is classified as Cold Semi-Arid - Cold Semi-Arid climate with mild summers (peaking in July) and freezing winters (coldest in January). Temperatures range from -14°C to 27°C. Semi-arid with limited rainfall.

Temperature & Rainfall

Temperature Range

27°

Warmest Month

-14°

Coldest Month

Monthly Conditions