Castle Rock, CO

Each November, Castle Rock lights a 100-bulb star above the town. The Star was built in 1936 during the Great Depression, partly to catch the attention of motorists on the route that became Interstate 25 and encourage them to stop. Firefighters carried materials up the Rock, local businesses supplied welding work and wire, and the town contributed money. Castle Rock Fire and Rescue still maintains it, and the Chamber of Commerce holds Starlighting on the Saturday before Thanksgiving. The ceremony joins a current downtown gathering to the formation that names the town, turning a butte visible from the interstate into both a geographic marker and a recurring civic tradition. The Rock itself is a remnant of far older floods. About 34 million years ago, rivers deposited layers of boulders and sediment that became tightly bound by opal, creating erosion-resistant Castle Rock Conglomerate.

ATTRJeff Albright / CC BY-SA 3.0

A different local stone, rhyolite, drove nineteenth-century settlement. The first quarry opened in 1872, and homesteader Jeremiah Gould donated 120 acres for a townsite in 1874. Six streets, a courthouse square, and 77 lots followed; Douglas County selected Castle Rock as its seat that year; incorporation followed in 1881. The Denver and Rio Grande depot arrived in 1875 to ship stone from three quarries and cheese from surrounding dairy farms. Built of local rhyolite, the depot now houses the Castle Rock Historical Museum. Castle Rock's present working life extends well beyond quarrying. The town estimated its 2025 population at 88,201.

ATTRBilly Hathorn / CC BY-SA 3.0

Its financial report identifies Douglas County, the school district, and the town government as the three largest local employers; health care and retail also supply several principal employers. The report also notes that many employed residents travel toward Denver or Colorado Springs, making Interstate 25 central to regional movement as well as local growth. Douglas County scheduled Link On Demand rides to and from Castle Rock to begin July 31, 2026. The free, app-based service runs Monday through Saturday, including evening hours on Friday and Saturday; riders can also request trips by phone, and a transfer may be required for travel across the larger service area. Community gathering places occupy both the ridges and the historic center. The 300-acre Philip S.

ATTRBilly Hathorn / CC BY-SA 3.0

Miller Park combines an amphitheater and activity complex with an eight-mile native-surface trail network and the 200-step Challenge Hill. Downtown, Festival Park sits where the East Plum Creek and Sellars Gulch trails meet. Its creekside lawn hosts First Fridays, a seasonal farmers market, and the Western Heritage Welcome, bringing trail users and event crowds into the blocks laid out in 1874. Local rhyolite remains visible in early buildings, including the old depot, while the namesake conglomerate can be hiked just north of downtown. These public spaces share the same materials as Castle Rock's history: residents can climb above town on stone formed by ancient floods, then return to a former quarry-and-rail center when the Star comes on at sunset.