Trail Overview

Great Sand Dunes High Dune is a achievable 2.5-mile out-and-back trail located in Mosca, Colorado. Gaining 700 feet in elevation on a Sand surface, the route follows an out-and-back route - you travel the same trail in both directions. Most visitors complete this trail in 2-3 hours. Whether you are an experienced outdoors person looking for a new challenge or someone stepping up from easier terrain, this trail rewards the effort with genuine highlights that make Mosca such a compelling destination for hikingers.

Trail at a Glance

  • Distance: 2.5 miles · Out-and-Back
  • Elevation Gain: 700 feet
  • Difficulty: Moderate
  • Surface: Sand
  • Best Season: Year-round
  • Estimated Time: 2-3 hours
  • Fee: $25 GSDNP fee
  • Dogs: Yes
  • Permit: No

What to Expect

The trail begins at the trailhead in Mosca and immediately reveals the character of the surrounding landscape. The Sand underfoot provides reliable traction for most conditions, and the route is clearly signed throughout. As elevation builds over the 2.5-mile distance, the scenery shifts through distinct zones — a defining feature of hiking in Colorado where the landscapes change dramatically with altitude.

The 700-foot elevation change is the heart of the experience. On the outbound leg you gain steadily before the turnaround, then return descending the same terrain - often a completely different experience in different light. At moderate difficulty, achievable for those with some trail experience, the reward is a summit, viewpoint, or destination that justifies every step.

Wildlife is an integral part of Great Sand Dunes High Dune. The habitat along the route supports the species typical of Mosca's ecosystems, and early-morning visitors are most likely to encounter animals actively moving through the landscape. Stay a respectful distance from any wildlife you encounter and resist the urge to approach or feed them — for their safety and yours.

Planning Your Visit

Plan your visit for Year-round to find optimal conditions. Fees apply: $25 GSDNP fee. Leashed dogs are welcome. No permit is required for day use. Arrive early on weekends and holidays to secure parking and beat the afternoon heat or weather that builds in many parts of Colorado. If you plan to stop frequently for photos or exploration, add extra time beyond the 2-3 hours average.

What to Pack

  • Water: Minimum 2 liters per person; more in warm weather or for strenuous sections
  • Navigation: Download the GPX file from this page before leaving home — cell service is unreliable on many Colorado trails
  • Sun protection: Sunscreen, hat, and UV sunglasses, particularly at elevation or in open terrain
  • Layers: A lightweight wind or rain layer even on sunny days — conditions change fast in mountain environments
  • Food: Energy-dense snacks for sustained effort; a full meal for longer days
  • First aid: Blister care, pain reliever, bandages, and any personal medications
  • Emergency: Whistle, emergency bivy or space blanket, headlamp with fresh batteries

Getting There

The trailhead for Great Sand Dunes High Dune is located in Mosca, Colorado. Before your visit, confirm current road and trail conditions with the managing agency — seasonal closures, weather events, and maintenance work can affect access at any time. Use the GPX file on this page to navigate to the trailhead and follow the route once you are on the trail.

Leave No Trace

Trails like Great Sand Dunes High Dune depend on the collective care of every visitor. Stay on the designated path — cutting switchbacks and wandering off-trail erodes soil, damages plant communities, and creates new paths that take years to recover. Pack out everything you carry in, including food wrappers, orange peels, and pet waste. If you bring a dog, keep it leashed at all times and clean up after it. Yield to uphill hikers, give horses and pack animals extra space, and keep voices low to avoid disturbing wildlife and other visitors seeking a quiet experience.

Download the GPX File

Ready to hike Great Sand Dunes High Dune? Download the free GPX file from this page to load the route into Garmin, Gaia GPS, Komoot, AllTrails, or any compatible navigation app. No account required — download the file, load it onto your device before you leave cell service, and you are set.