Molas Pass

Molas Pass is a mountain pass on U.S. Highway 550 that winds through the San Juan Mountains in western Colorado near Silverton. The road crosses through the San Juan National Forest, connecting two historic mining towns along one of the region's most traveled mountain routes.

The pass forms part of the Million Dollar Highway, a historic route built in the early 1900s to connect Silverton and Durango through mining country. This road transformed transport in the region by linking the remote mountain mining towns to broader markets and settlements.

The pass hosts the Iron Horse Bicycle Classic, an annual race where cyclists compete directly against a historic steam train traveling from Durango to Silverton. This event draws athletes and spectators who gather to witness the unusual rivalry between human power and steam power unfolding across the mountain landscape.

The road is passable year-round by vehicle, but you should carry winter tires or snow chains from October through April. Allow extra driving time during bad weather and check road conditions before your trip, especially after snowfall or during severe weather events.

Just near the pass sits Little Molas Lake, a mountain lake at over 10,000 feet elevation where visitors can fish or paddle a non-motorized boat. The lake offers a quiet break from driving and serves as a popular stopping point for travelers crossing this high mountain route.

Location: San Juan County

GPS coordinates: 37.73780,-107.69800

Latest update: December 11, 2025 11:04