The Hillsborough Castle Festival 10k is a multi-terrain race that starts and finishes within the grounds of Hillsborough Castle and Gardens in County Down. The course navigates through the historic parkland and past landmarks such as Hillsborough Lake and Hillsborough Fort before heading out onto the surrounding forest paths and closed rural roads, including Ballynahinch Road. The route follows an undulating profile and concludes with a final lap through the castle gardens to the finish line in the event village.