Embark on an exhilarating trail adventure at the Rosaryville Half Marathon and 10K Trail Run, set for Saturday, March 28, 2026, in scenic Upper Marlboro, MD. This popular early-season race offers a beautiful and engaging experience within Rosaryville State Park, renowned for its mixed hardwood forests and open fields. Runners can choose between the challenging half marathon, covering approximately 13.5 miles, or the invigorating 10K, which spans about 6.7 miles, along with a 5K option. The course features twisty, relatively smooth, and fast trails, making it ideal for both seasoned trail runners and beginners alike, with undulating hills providing about 1,000 feet of elevation gain for the half marathon and 500 feet for the 10K. As you navigate the perimeter and interior trails, you'll be treated to picturesque natural beauty, passing by the historic Mount Airy Mansion.

The race is well-supported, with 9 aid stations for the half marathon and 4 for the 10K, all stocked with water and Gatorade, and one half marathon aid station also offering snacks around mile 8.8. The start and finish are conveniently located at Pavilions 1 and 2, with ample parking in adjacent grass fields, and the park entrance fee is covered for participants. Typical race day conditions in late March include comfortable highs around 61°F and lows around 39°F, with a minimal 13% chance of precipitation, promising pleasant running weather. This event is celebrated for its friendly atmosphere and accessible yet rewarding trail experience, making it a perfect way to kick off your spring running season.