BROR’s Twilight Trail Series takes place across three 5K / 10K trail races held on some of Prince William Country Virginia’s best maintained, yet largely unknown, trails. All courses in the series are designed using existing hiking trails that include a mix of natural terrain, gravel, stream crossings, pedestrian bridges, grassy fields, and very minimal pavement. As part of BROR’s mission, 100% of race proceeds are donated to local area non-profit organizations.
Leopold’s Nature Preserve, which runs parallel to the North Fork Broad Run, is replete with several miles of interpretive trails, old hardwood forests, wildflower meadows, rock formations, and water features. This race course in contained entirely within the 7 miles of hiking trails, with the starting 1/4 mile paved and the entire rest of the course on natural terrain grass, dirt and leaves. This course begins and ends at the trailhead within the Villages of Piedmont neighborhood on Market Ridge Blvd. (NOT the public trailhead on Thouroughfare Rd.) and has a mini family-fest with games/activities, face painters and more. 
This event also has a 1-mile fun run, race is untimed but all participants receive race shirt and race bib.