Castle Rock to open Lost Canyon Ranch trails next summer

Castle Rock’s largest open space purchase is still off-limits, but the first public trails at Lost Canyon Ranch Open Space are planned to open in summer 2026, with construction already reshaping the 681-acre site in southeastern Castle Rock.

The town acquired the property in May 2024 for $15,009,432 with help from Douglas County, Great Outdoors Colorado, The Conservation Fund and Douglas Land Conservancy. Douglas Land Conservancy holds the conservation easement, and town documents say the deal preserved one of the last undeveloped large-acreage properties near Castle Rock.

For now, the property remains closed to the public because of ongoing construction. Town project updates say visible trail work began in January 2026 as crews started building the core trail system and preparing the site for public access. The first phase also includes stabilized gravel on interior roadways, trailhead parking, traffic calming along Lost Canyon Ranch Road, entry improvements and wayfinding signs.

The Town Council approved the Lost Canyon Ranch Open Space Master Plan and Management Plan in September to guide long-term stewardship. The plan calls for protecting natural habitat and cultural resources, opening the site for passive recreation and education, tying it into Castle Rock’s trail network and creating a buffer against development pressure. That balance matters in a fast-growing part of Douglas County, where roughly 30% of Castle Rock is already designated open space.

The landscape itself is part of the draw. The town describes Lost Canyon Ranch as rolling grasslands, towering ponderosa pines, dramatic canyon cliffs, rich wildlife habitat and scenic views that echo nearby Castlewood Canyon State Park. The property sits next to the state park and near Franktown Cave, a prehistoric archaeological site that adds cultural weight to the opening.

Castle Rock has also kept expanding the footprint around the property. In January 2026, Town Council approved a $1.1 million purchase of about 35 adjacent acres for future open space, reinforcing the town’s long-term plan to connect recreation access with preservation. The 2025-to-2027 Parks and Recreation Strategic Plan says the department will continue expanding open space access through activation of Lost Canyon Ranch.

For Douglas County residents, the opening next summer will mark more than a new trailhead. It will bring first access to a major canyon landscape while keeping conservation rules, construction limits and neighborhood impacts firmly in view.