Mosca Pass Trail

From the trailhead near the visitor center, the path climbs steadily eastward alongside Mosca Creek, crossing it several times as it rises through a shaded corridor of aspen, cottonwood, and pine. In summer the understory is dotted with wildflowers, and birds flit through the trees; in fall the aspen turn brilliant gold.

The full hike to Mosca Pass is roughly seven miles round trip with a steady climb, ending at a broad saddle in the mountains with views to the east. Hikers wanting a shorter outing can simply walk part way up and turn around, still enjoying the creek and forest.

Mosca Pass has long been a natural gateway through the rugged Sangre de Cristo Mountains. Native peoples and early Spanish and American travelers used the route, and in the late 1800s a wagon toll road was built over the pass to connect the San Luis Valley with the plains to the east.

Today the old road corridor is a peaceful hiking trail. Because it sits at high elevation and climbs steadily, hikers should pace themselves, carry water, and be prepared for afternoon thunderstorms in summer. The reward is a quiet, green mountain experience within a park famous for its sand.

The closest Boutel™ stays, so you can turn this stop into an overnight. Each is a place we chose through independent editorial review, never a paid placement.

The Mosca Pass Trail is a forested hiking trail in Great Sand Dunes National Park, Colorado, that climbs from near the visitor center up a mountain creek to Mosca Pass in the Sangre de Cristo Mountains. It offers a cool, green, shaded contrast to the open, sunny dune field, winding through aspen and pine alongside tumbling Mosca Creek, with wildflowers, birds, and mountain views along the way. The trail follows a historic route through the mountains, once used by Native peoples and early travelers and later served by a wagon toll road. The full hike to the pass is a moderate outing of about seven miles round trip, though shorter walks up the lower trail are also rewarding.

The full Mosca Pass Trail is about seven miles round trip, climbing roughly 1,500 feet from the trailhead near the visitor center up to the pass, which makes it a moderate hike rather than an easy stroll. The climb is steady, and because the trail sits at high elevation, in thin mountain air, it can feel more tiring than the distance suggests, so it is wise to pace yourself and carry plenty of water. Many hikers choose to walk only part way up, following the creek and aspen for a mile or two before turning around, which is still a lovely outing. Watch for afternoon thunderstorms in summer, and enjoy the golden aspen if you go in the fall.

The Mosca Pass Trail offers a completely different experience from the dunes, which is exactly why it is worth doing. While the dunes are open, sandy, sunny, and often hot, Mosca Pass is shaded, green, and cool, following a tumbling creek through aspen and pine into the mountains. It is a wonderful choice on a hot day, for a change of scenery, or for anyone who enjoys forest hikes, wildflowers, and birdwatching. It also reveals that Great Sand Dunes National Park protects far more than sand: it includes creeks, forests, and rugged mountains rising above the dune field. Many visitors enjoy pairing a morning on the dunes with an afternoon or a cooler day on this trail.

Mosca Pass is a natural low point in the rugged Sangre de Cristo Mountains, and it has served as a passage through the range for centuries. Native peoples used the route long before Europeans arrived, and later Spanish and American travelers crossed here between the San Luis Valley and the plains to the east. In the late 1800s, a wagon toll road was built over the pass to carry goods and travelers, and remnants of that history are part of the trail's story. Today the old road corridor is a quiet hiking trail within Great Sand Dunes National Park, letting visitors follow in the footsteps of those earlier travelers while enjoying the creek, forest, and mountain scenery.