Trail Running calendar near Arnold 2025-2026

Devil Dog Ultras is a challenging trail running event held in Prince William Forest Park, Triangle, Virginia, featuring 100-mile, 100K, and 50K distances. The course consists mainly of single-track trails with some roots, rocks, and brief technical sections, along with fire roads and rolling hills b..

The Fall Backyard Burn Trail Run at Fountainhead Regional Park in Fairfax Station, VA, is a popular trail running event held on December 7, 2025. The race offers two challenging distances: a 4.8-mile loop with 450 feet of elevation gain and a tougher 10.5-mile course featuring an additional out-and-..

The Mid-Maryland Trail Festival 50k is a 31-mile ultramarathon held at Rockburn Branch Park in Elkridge, Maryland. The course consists of six loops, each approximately 5.179 miles, winding through wooded trails. Participants can run the full 50k solo or form relay teams of 2 to 6 members, exchanging..

The Dahlgren Trail Half Marathon, held in King George, Virginia, offers a scenic out-and-back course along the flat, smooth Dahlgren Railroad Heritage Trail. This event features a 13.1-mile race on an old railroad bed, providing a comfortable and picturesque running experience. Participants enjoy ca..

The Paradise Springs 10k is a challenging trail running event held at Hemlock Overlook Park in Clifton, Virginia. The course features technical terrain with significant elevation changes and rocky sections, running alongside the river. The 10k race consists of two laps of the 5k route.Participants e..

No Man's 50K is a women-only trail running endurance event held in Triangle, Virginia, featuring distances of 25K and 50K. The course consists of two loops of approximately 15 miles each, designed as a great first-time ultramarathon route. Runners experience a mix of terrain with about 70% single tr..

The HAT Run 50K is a trail running event held in Havre de Grace, Maryland. The course primarily consists of single-track trails, open fields, dirt roads, and some paved sections, featuring nearly 4,400 feet of elevation gain. Runners start with a 3-mile loop followed by two 14-mile loops. A notable..

The Capital Backyard Ultra is a challenging endurance running event held at Meadowood Special Recreation Management Area in Lorton, Virginia, near Washington DC. This unique race features a 4.167-mile loop that starts every hour on the hour, with runners required to complete each loop within the hou..

The Genesee Valley Ultra is an endurance running event held at the Genesee Valley Outdoor Learning Center in Parkton, Maryland. It features a 2.5-mile trail loop through farm roads, grass fields, and some double track on private property. Participants can choose from 6, 12, or 24-hour race durations..

The Sheetz-to-Sheetz Trail Run is a 14-mile untimed point-to-point trail run held in King George, Virginia. Starting at a Sheetz convenience store near King George Middle School, the course follows rural roads briefly before transitioning to the flat, well-marked Dahlgren Railroad Heritage Trail, a..

The Bull Run Run (BRR) 50 Miler is a classic 50-mile trail race held annually in Clifton, Virginia, within Hemlock Overlook Regional Park. Established in 1993 and organized by the Virginia Happy Trails Running Club, it is one of the oldest 50-mile races in the U.S. The course features forested, roll..

The Breeze Thru The Trees 5k is a cross-country running event held at Ruppert Nurseries, a 500-acre tree farm located in Gaithersburg, Maryland, within Montgomery County’s Agricultural Reserve. The event features a 5K run and a 1-mile fun run, offering participants a scenic course winding through a..

Run to Remember in Sykesville, MD, is a memorial running event held at Piney Run Park, featuring distances of 50K, 25K, 5.25 miles, and an 8-hour challenge. The course is a scenic 5.25-mile loop through woods and meadows, with about half the route offering lake views. Runners complete multiple loops..

The C&O Canal 100 is a 100-mile ultramarathon held in Knoxville, Maryland, along the scenic C&O Canal towpath near the Potomac River and Appalachian Mountains. The course features one approximately 40-mile loop followed by two 30-mile loops, starting and finishing at Camp Manidokan. Runners enjoy te..

The Farm Park Challenge is a unique trail running event hosted by My Muddy Shoes at the Agricultural History Farm Park in Montgomery County, Maryland. Participants can choose from three timed challenges—3-hour, 6-hour, or 10-hour—where runners must complete one lap of the course each hour, resting o..

The Race4Warriors Half Marathon is part of a multi-distance event held in Lewes, Delaware, featuring 5K, 10K, and Half Marathon challenges. The race supports Wounded Warriors and Homeless Veterans and aims to unite military and civilian communities. The USATF-certified course starts and finishes at..

The More Miles Last One Standing Challenge is an endurance running event held in Knoxville, Maryland, featuring a unique "last one standing" format. Participants run a 4.167-mile loop, known as "the yard," every hour on the hour, completing each lap within the hour to continue. The race continues un..

The OSS/CIA 50 Mile Night Run is a challenging ultramarathon held in Prince William Forest Park, Virginia, a historic site once used to train World War II OSS spies, predecessors to the CIA. The race features a 50-mile distance composed of two laps on a 25+ mile loop primarily on single-track trails..