Castlewood Canyon State Park is a Colorado state park near Franktown, Colorado. The park protects a unique part of Colorado's history.

Nature lovers and groups enjoy environmental diversity on several hiking trails ranging from mild to moderate. The trails range from .5 to 4 miles and can be combined for longer journeys. The winding Cherry Creek flowing along the canyon floor provides wonderful rest stops. Pets, on a leash, are welcome on most trails, except the new East Canyon Preservation Area trail.

The natural amphitheater and the Bridge Canyon Overlook gazebo perched on the edge of the canyon are unique places for weddings or other outdoor ceremonies. Casual groups and families enjoy the picnic areas at both entrances. Remnants of geologic and local history combine when the then Castlewood Dam burst in 1933, sending a 15-foot-high wave of water into Denver. Ruins of the original ill-fated dam and the historic homestead still exist for hikers to see.

Castlewood Canyon is a day-use park.

All Colorado State Parks have entrance fees. All vehicles are required to have an entrance pass and some parks have walk-in fees. Visit the Colorado Park Entrance Pass web page.