Rosaryville Half Marathon, 10K, 5K Trail Run

Get ready for an exhilarating early-season trail adventure at the Rosaryville Half Marathon, 10K, and 5K Trail Run, set for Saturday, March 28, 2026, in scenic Upper Marlboro, MD. Conveniently located off the Capital Beltway, Rosaryville State Park offers a perfect blend of challenging yet beginner-friendly terrain, making it an ideal race for all skill levels. Runners can choose from diverse distances: the Half Marathon+ (approximately 13.5 miles), the 10K+ (around 6.7 miles), or the 5K+ (about 3.6 miles), all winding through the beautiful mixed hardwood forests and open fields of the park.

The course is renowned for its twisty, relatively smooth, relatively flat, and fast trails, ensuring an enjoyable experience without being overly technical. The Half Marathon+ features a challenging approximately 1,000 feet of elevation gain, while the 10K+ offers around 500 feet, and the 5K+ about 250 feet. Expect ample support along the way, with 9 aid stations for the Half Marathon+, 4 for the 10K+, and 2 for the 5K+, all stocked with water and Gatorade, and the Half Marathon course includes snacks at approximately 8.8 miles. Typical race day conditions in late March bring comfortable highs around 61F and lows around 39F, with a minimal 13% chance of precipitation.

The race starts and finishes at Pavilions 1 and 2 within Rosaryville State Park, with covered parking provided, eliminating park fees. Runners frequently praise the course as beautiful and fun, leaving them with smiles at the finish. Beyond the personal challenge, this event also partners with City Kids, offering an opportunity to contribute to a great cause. Whether you're aiming for a personal best or simply soaking in the natural beauty, the Rosaryville Trail Run promises a memorable day on the trails.