Great Sand Dunes National Park and Preserve

Great Sand Dunes preserves the tallest sand dunes in North America, a dunefield covering roughly 30 square miles at the western foot of the Sangre de Cristo Mountains. The tallest dunes, Star Dune and High Dune, rise about 750 feet above the valley floor, which sits around 8,200 feet up to begin with. The sand was built over tens of thousands of years, blown across the wide San Luis Valley until it piled up in a pocket where the prevailing winds meet the wall of 14,000-foot peaks. Trapped there, it grew into the sea of sand you see today.

The signature sight is that improbable contrast: a mountain of golden sand set against snow-capped summits, with the wide, dry basin of the San Luis Valley stretching away in every other direction. In spring and early summer, Medano Creek flows along the base of the dunes, a wide, shallow snowmelt stream that behaves like a natural beach in the mountains. The main way in, off CO-150, leads straight to this meeting of sand, creek, and peaks, and it is the picture most people carry away from the park.

The dunes are only the centerpiece. In a short distance the park climbs through wetlands and grassland, across the sand, and up into aspen and conifer forest and alpine tundra on the high peaks, several life zones stacked together. That range means a visit can pair sand play at the bottom with cool mountain trails and a hidden waterfall just up the road, all within the same park.

• The Main Entrance, off CO-150 from US-160 near Mosca, is the only way in and is open year-round. It leads to the Great Sand Dunes Visitor Center and to the day-use area and Medano Creek at the base of the dunes.
• From the north or the Front Range, take US-160 west over La Veta Pass toward Alamosa, then turn north onto CO-150 to the entrance. From Alamosa, the largest town in the valley about 35 miles to the southwest, follow US-160 east and then CO-150 north. Fill up on gas and water before you arrive, because services in the valley are spread far apart.

• Climbing and sledding the dunes is the classic Great Sand Dunes experience. There are no trails on the sand, so you pick a ridgeline and go, then strap on a sandboard or sand sled and slide back down. Boards and sleds are rented outside the park, since regular snow sleds do not slide well on dry sand.
• Medano Creek, which flows along the dune base in spring and early summer, spreads into a wide, shallow, sandy stream that families wade and splash in. It even pulses with gentle surge waves when small sand ridges collapse upstream.
• Zapata Falls, about a 4-mile round-trip hike, leads to a 25-foot waterfall hidden inside a slot canyon in the Sangre de Cristo foothills, with wide views back over the dunes on the way in.
• Baca National Wildlife Refuge, adjacent to the park, protects wetlands and grasslands that draw birds and wildlife against the same mountain backdrop.
• Alamosa, about 35 miles south, is the largest town in the San Luis Valley and a good base for supplies, food, and a look at valley history.
• Crestone, about 23 miles north, is a small spiritual community tucked at the foot of the Sangres, known for its quiet and its retreat centers.

Long before it was a park, this stretch of the San Luis Valley was home to the Ute, the Jicarilla Apache, and other Indigenous peoples who lived, hunted, and traveled across the basin and its dunes. The Ute in particular have deep and lasting ties to this valley and the surrounding mountains, which remain sacred to them, and their connection to the land reaches back many generations. Later, Hispano settlers moving north from New Mexico farmed and ranched the valley, and their communities are still woven through the region today.

The dunes drew growing attention in the early twentieth century, and in 1932 President Herbert Hoover set the area aside as Great Sand Dunes National Monument to protect the towering sand and the wildlife around it. For decades it stayed a monument, a beloved but out-of-the-way stop in a remote corner of Colorado.

In 2004 Congress greatly expanded the protected area and elevated it to Great Sand Dunes National Park and Preserve. The change added the mountains, wetlands, and grasslands that surround the dunes, recognizing that the sand is part of a much larger connected system of water, wind, and peaks. The preserve portion covers the high country of the Sangre de Cristo Mountains that rises directly behind the dunefield.

Protecting the whole system also protected the water that keeps the dunes in place. Scientists learned that streams like Medano Creek and the wet sand beneath the surface are what hold the dunefield together, recycling sand back into the pile rather than letting it blow away. Understanding that hidden water cycle was a big reason the park boundaries were drawn as wide as they are.

• Star Dune and High Dune, the two tallest dunes here, rise about 750 feet above the valley floor, making these the tallest sand dunes anywhere in North America.
• The dunes only stay put because of water. A hidden layer of wet sand and the streams that ring the field recycle sand back into the pile, so the whole dunefield is far more stable than it looks.
• Medano Creek produces surge waves, a rare rhythm where dammed-up sand gives way and sends a small wave rolling downstream every few seconds. Only a handful of streams in the world do this.
• The park protects six distinct life zones in a short vertical distance, from valley wetlands and grassland through the sand to forest and alpine tundra on peaks above 13,000 feet.
• Great Sand Dunes is a certified International Dark Sky Park, and the dune area stays open around the clock partly because the night skies here are so extraordinary.
• The Kangaroo rat and other creatures found around the dunes survive without ever drinking free water, getting all the moisture they need from the seeds they eat.
• Because the surrounding mountains still hold snow into summer, you can sometimes wade in a snowmelt creek and climb a 750-foot mountain of sand on the very same day.

• An entrance fee applies (per vehicle, good for seven days); check the park website for current rates.
• The dune area is open 24 hours a day, and the darkness makes it a favorite spot for stargazing after nightfall.
• Medano Creek generally flows April through June, though the exact timing shifts from year to year depending on the winter snowpack.
• No vehicles or bikes are allowed on the dunes; you explore the sand on foot.
• Pinon Flats Campground is located near the entrance for those who want to stay the night in the park.
• The Oasis Store near the entrance rents sandboards and sand sleds, which slide far better than an ordinary snow sled on the dry sand.

Yes. Great Sand Dunes charges a per-vehicle entrance fee that is good for seven days, and interagency annual passes are accepted; check the National Park Service website for the current rate. The park and the dune area are open year-round, and the dunes themselves stay open around the clock, which makes them a favorite for stargazing after dark.

Yes, and it is the signature thrill of a visit. You do need special sand boards or sand sleds made for dry sand, because ordinary snow sleds and cardboard do not slide well on it. These are rented from vendors just outside the park, including the store near the entrance. There are no set runs, so you hike up the soft sand and pick your own slope, which is a real workout going up and a fast ride coming down.

Medano Creek is fed by snowmelt from the mountains and generally flows from around April through June along the base of the dunes. Peak flow, when the creek is widest and the surge waves are strongest, usually falls in late May to early June, though the exact timing varies year to year with the winter snowpack. By late summer the creek is usually dry, so if the beach experience is what you are after, plan for late spring to early summer and check current conditions on the park website.

The sand surface can get dangerously hot on summer afternoons, far hotter than the air, which can burn bare feet and paws and make midday hiking risky. In warm months, visit the dunes early in the morning or in the evening, wear closed-toe shoes, and carry plenty of water. Afternoon thunderstorms also bring lightning danger on the open, exposed sand, so get off the high dunes if a storm is building. Timing your dune time for the cooler hours and staying hydrated are the keys to a safe visit.

It is worth planning for both. The dunes sit around 8,200 feet, and the high country climbs well above that, so some visitors feel the thin air, especially while climbing the soft sand. Take it slow, drink extra water, and rest if you feel lightheaded. The high desert also swings sharply from day to night, with warm or hot afternoons and surprisingly cold nights, so bring layers even in summer, particularly if you plan to stay out for the stars.

Late spring through early summer is the most popular window, because Medano Creek is flowing and the creek beach is at its best, usually peaking in late May and June. Fall brings pleasant temperatures and thinner crowds, and the light on the dunes is lovely. Summer days can be very hot on the sand, so plan dune time for early morning or evening. Winter is cold and quiet but beautiful, with snow sometimes dusting the golden dunes.

You can take in the visitor center, walk out to the creek, and climb partway up the dunes in a half day. To reach a high crest, sled back down, and not feel rushed, give it a full day, and be ready for a strenuous climb in soft sand. Add more time if you want to wade Medano Creek in season, hike to Zapata Falls, or stay after dark for the stars.

Pets are welcome in much of the park, including the main day-use dunes area, on a leash, which is unusual for a national park. Keep in mind that the sand gets extremely hot in summer and can burn paws, so bring plenty of water and stick to the cooler morning and evening hours with a dog. Some trails and the preserve backcountry have stricter rules, so check the park website for the current pet policy before you go.

Inside the park, Pinon Flats Campground near the entrance is the main place to spend the night, and there is backcountry camping on the dunes and in the preserve with a permit. There is no lodge inside the park, so for hotels and services most visitors base themselves in Alamosa, about 35 miles to the south, or in the smaller valley towns. Book ahead in late spring and summer, when the creek season draws the biggest crowds.

Great Sand Dunes is a certified International Dark Sky Park, set in a remote, high, and very dry valley far from city lights. On a clear, moonless night the Milky Way arches from mountain to mountain and the dunes glow faintly under the starlight. The dune area stays open all night, so many visitors walk out onto the sand after dark. Bring warm layers, since the high desert cools off quickly once the sun goes down.