Redstone Historic District, National historic district in Pitkin County, Colorado

Redstone Historic District occupies a mile-and-a-half strip along the Crystal River in Pitkin County, Colorado, on the original surveyed lots of the company town. It holds 32 buildings, three structures and one object, mostly small wood-framed cottages, with larger buildings set along the mountain slopes. Redstone Boulevard, lined with original Llewellyn Westinghouse cast-iron streetlamps, runs through it.

Redstone began as a Colorado Fuel and Iron company town; president John Cleveland Osgood built quality housing and public buildings, including his estate Cleveholm and the Redstone Inn, to forestall unionization. After CFI's 1892 formation, the nearby coke ovens briefly made Redstone populous, but costly transport to the steel mill nearly emptied it within a decade. A handful of residents stayed, and the district was listed on the National Register in 1989.

Redstone Boulevard, the district's spine, is still lined with some of its original Llewellyn Westinghouse cast-iron streetlamps. The town's name comes from the red sandstone of the surrounding cliffs, not from its buildings. Today a small arts community occupies the restored company houses.

Redstone is reached only by State Highway 133; a bridge crosses the Crystal River into the district, and Redstone Boulevard (County Route 3) runs north–south as its backbone, lined with original Llewellyn Westinghouse cast-iron streetlamps. The district is a 1.5-mile strip, so walking it is the way to see the 32 buildings, three structures and one object. Aspen lies 22.5 miles due east.

Redstone Boulevard, the district's spine, is still lined with some of its original Llewellyn Westinghouse cast-iron streetlamps. The district covers 493 acres, making it the largest of Pitkin County's four historic districts, and holds 32 buildings, three structures and one object. Just across the river bridge stands the smaller Redstone Coke Oven Historic District, the remains of the coking works that once employed many residents.