FORT SISSETON Historic State Park 2025 Annual Events Historical Festival June 6 - 8 Northern Fort Playhouse Weekends in July Harvest Festival September 20 Haunted Fort October 17 - 18 Frontier Christmas December 13 Open year-round featuring fourteen historic buildings, museum, site tours, special events, and outdoor recreation opportunities SOUTH DAKOTA Game, Fish & Parks Fort Sisseton Historic State Park is ten miles southwest of Lake City off SD Highway 10 GFP.SD.GOV/FORT-SISSETON 605.910.4465 FORT SISSETON HISTORIC STATE PARK FORT SISSETON Historic State Park 2025 Annual Events Historical Festival June 6 - 8 Northern Fort Playhouse Weekends in July Harvest Festival September 20 Haunted Fort October 17 - 18 Frontier Christmas December 13 Open year - round featuring fourteen historic buildings , museum , site tours , special events , and outdoor recreation opportunities SOUTH DAKOTA Game , Fish & Parks Fort Sisseton Historic State Park is ten miles southwest of Lake City off SD Highway 10 GFP.SD.GOV/FORT-SISSETON 605.910.4465 FORT SISSETON HISTORIC STATE PARK