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Great Sand Dunes National Park
Great Sand Dunes National Park near Mosca.

Great Sand Dunes National Park & Preserve – Mosca

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​Great Sand Dunes is a truly unique national park, located northeast of Alamosa in the San Luis Valley. The 150,000 acre park and preserve is a mixture of grasslands, wetlands, forests, lakes, high peaks and what it’s known for, giant sand dunes.

The park offers exceptional views of the Sangre de Cristo Mountains, which lie just at the base of it. The 30 square mile dunefield is the tallest and largest in North America, at 750 feet vertical. It costs $3 per adult over 16 to get into the park. It’s good for one week.

Camping, Hiking and Horseback Riding

Great Sand Dunes National Park
The Great Sand Dunes National Park and Preserve.

As the tallest sand dunes around, the Great Sand Dunes are quite a sight! The tallest one is Sand Dune at 750 vertical feet. The dunes are the main attraction in the park, as there’s not too much else to explore. A seasonal creek runs around the dunes, but dries up, and is not fished.

Surrounding the park are the Sangre de Cristo Mountains. These snow capped peaks, fuel Medano and Sand Creeks which run seasonally at the base of the dunes. Medano creek is one of the best places to see “surge flow”, where waves come in rhythmic, 15-second intervals due to sand buildup on the creek bed. Shortly after leaving the park the creek disappears into an underground aquifer. The creek is usually dry by the end of the summer.

There are are three large campgrounds loops, that all get fairly windy and crowded. Reservations are highly recommended. Pinyon Flats Campground has 88 total sites, half are reseravable. High clearance 4×4’s can find free, primitive camping on Medano Pass, first come, first serve. Folks with a 4×4 can access the Medano Pass Primitive Road. Nearby San Luis State Park has plenty of campsites that look out to the dunes and are generally less crowded. Zapata Falls also has a campground loop that overlooks that beautiful San Luis Valley.

The main hike leads you up the face of High Dune, the closest and 2nd largest dune. Wear shoes and not flip flops or bare feet. The sand gets hot, so hiking in morning or late afternoon is best. During the summer, the sand is usually too hot for most dogs. Horseback riding and seasonal hunting are also popular.

How the Sand Dunes Formed

Great Sand Dunes National Park High Dune
Hiking up High Dune at Great Sand Dunes.

Wind and water eroded the mountains and streams deposited sand onto the valley floor. Southwesterly winds then collected sand from across the San Luis Valley before being block by the Sangre de Cristo Mountains.

The sand was then dropped at the base of the mountains. Wind also came from the northeast reversing the wind flow and blowing sand back toward the Dune Field.

Activities at Great Sand Dunes

Mountain Living Medano Creek Sand Dunes
Medano Creek morning. Photo: Christian Collins

Backpacking, Camping, Hiking, ​Horseback Riding, Hunting, Picnicking, Sandboarding, Skiing & Sledding on the Dunes, 4WD Medano Pass Primitive Road, Swimming in Madano Creek, Visitor Center

Camping: Yes; they fill up quickly during peak season. Reservations

  • Pinyon Flats Campground – Loop 1 (44 sites), first-come, first-served; Loop 2 (also 44 sites) and 3 other group sites are reservable.
  • Medano Pass Primitive Road Campsites – Free, includes backpacking and car camping along the Medano Pass 4WD road, first-come-first-served. High-clearance 4WD is required for car camping along Medano Pass.
  • Nearby Campgrounds (not in Park) – San Luis State Park; Zepata Falls; Great Sand Dunes Oasis is next door, greatdunes.com
  • Read about the camping near Alamosa, Sand Dunes and the San Luis Valley.

Hiking: There are a number of exciting trails within the park, although most people just start hiking up the bib dune from Medano Creek. You can escape the crowds in the Great Sand Dunes Wilderness, which offers 32,643 acres of backcountry exploration. Part of Park and Preserve hold a portion of the Sangre de Cristo Wilderness as well. It’s home to 4 fourteener mountains, all close together known as the Crestone Group.

  • Sand Dunes – The 30 square-mile sand dunes are open for exploration. Hike anywhere you like. High Dune is the most popular and closest to Visitor Center. It’s a 650-foot vertical hike, which takes 2-3 hours round trip. It’s tough hiking in sand, much like snow. Star Dune is the highest at 750 feet vertical.
  • ​Sand Sheet Loop Trail – An easy, 1/2 mile loop trail located just behind the Visitor Center. There are several informational plaques located around this 20 minute loop. Learn about the geology, plants, humans and animals of the San Luis Valley.

Horseback Riding: Permitted in park; leave trailer at Medano Pass Primitive Road. There are also 3 licensed providers of guided horseback trips who will meet you in the park with horses by reservation.

Hunting: Only permitted in the National Preserve during designated seasons, not in the National Park. See NPS hunting page (here).

​Tips for Visiting the Sand Dunes

Sand Dunes National Park, CO
Sand Dunes National Park, CO. Photo: daveynin
  • During summer sand gets very hot, up to 140°F. Hike in early morning or early evening. Dogs usually don’t last long on the sand dunes due to their paws getting hot.
  • Take your time and drink plenty of water. Wear suncreen, sunglasses and a hat.
  • ​Campsites fill up quickly during peak season. Reserve early or check out nearby campgrounds.
  • Wear sneakers while hiking up the sand. Flip-flops or going bare-foot are bad choices.
  • Bring lunch with you. The gift shop sells only a few snacks.
  • Use a slick, rigid, flat sled on sand. Saucers won’t work.
Visitor Center is open 9am-5pm, daily.
Nice setup.
Amphitheater.
Campsites look out onto the dunes.
Another campsite.
The seasonal Medano Creek.
Hiking up to the High Dune.
Looking back toward the creek.
Hiking in the sand is long and slow, like snow.
Slow and steady to the top.
Nearing the top! The best part about the hike is running down afterwards.
View from the top of the Sangre de Cristo Mountains.
Star Dune in the distance on the right is the highest, 100 feet more than High Dune.
It probably took 2 hours to reach the top.
Heading back down.
Great Sand Dunes National Park and Nature Preserve.
Medano Creek running below the Sand Dunes.
Visitor Center is open 9am-5pm, daily.
Sand Sheet Loop Trail is a nice introductory hike.
Pinyon Flats Campground is located in a pinyon pine forest.
Some campsites have exceptional views of the Dunes.
Medano Creek flowing south.
Looking north up Medano Creek.
Looking south from the dunes.
Hikers climb up to the top of High Dune.
About half way up High Dune.
Hiking in the sand.
Nearing the top of High Dune.
View of the Sangre de Cristo Mountains from atop High Dune.
Still at the top, looking towards Medano Creek.
Star Dune in the distance, the highest dune, 100 feet higher.

Details

Address: 11500 Hwy 150, Mosca, CO (near Alamosa)

Phone: 719-378-6300

Season: Year round, 24 hours a day

Fees: Yes per adult (16)

Pets: Yes, on-leash

Maps: Great Sand Dunes Visitor Guide (PDF)

Campground: Reservations

Website: nps.gov/grsa

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