Rosaryville is a 982 acre day-use park and the location of the historic Mount Airy Mansion. Miles of trails for hiking, biking and equestrians are available for day use. To gain access to Rosaryville State Park, make a right turn into the entrance just south of Osborne Road while traveling south on U.S. 301. Two pavilions, each accommodating 200 guests, are available for rent. A bathroom is a short distance from the pavilion area. A $100 security deposit is required for all pavilion rentals. For pavilion reservations at Rosaryville State Park please call 301-856-9656.
Nice, smooth, flow-y single-track - Nothing technical. There are a few climbs, but nothing long and/or crazy steep. It can be dangerous as visibility is low and some people decide to hike/bike counter clockwise. But overall it's great and has become my go-to trail since moving to the area.
I deducted one star because the markings are not great and a few times I got to an fork or area and had to just pick a way to go and hope I stayed on the loop. Soon after you start, you'll hit an abandoned parking lot; Continue through it and across the road you'll see the trail continue.