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.
Good lengthy trail and pushes you a little with the rolling elevations and switchbacks. I did this on a ninety degree day and it was warm in the forest but not too bad. Take more water than you think you need. I thought the signage could have been better as it's interspersed with the same white markers but there are segment numbers, mileage markers and directional arrrows. You never know exactly what you are going to know when you come up to one. I also did not understand why there were no trail maps displayed at the two locations where there could have been other than the initial entrance. ( abandoned parking lot and the road crossing to the wooden bridge). I agree that most of the traffic I met with were hiking the trail counter clockwise while I was going clockwise for the same "hills early" reason some other hikers commented on. I was out there for most of the afternoon and only came across ten people (Saturday). Three on bikes, two on foot walking their dogs, five hiking.
Nice trail. It's fairly easy, although it does take a while. Trail is well-marked but there are a few points where it can be hard to follow.
If you are hiking, I would recommend the counter-clockwise route. This allows you to avoid being surprised by mountain bikers.