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The Marlborough Horse Trials
Rosaryville State Park
Upper Marlboro, MD
Address: Rosaryville State Park, Upper Marlboro, MD 20772. Park entrance is on Marlton Road West off Rt. 301 South. It is not on Rosaryville Road! For GPS use 7700 W. Marlton Dr, Upper Marlboro MD 20772. This will direct you to the park entrance--look for W. Marlton Rd to enter.This is a one-way road. Bear right at the fork for the horse trials. Go straight to exit back to U.S. 301 S.
From South: I-95 to MD, Rt. 4 east to US Rt. 301 South 4 miles to Rosaryville State Park. Entrance is on the right just after Rt 301 crosses Osborne Road (Exxon station and 7-11 store on the right at Osborne and Rt 301). From North: I-97 to MD Rt 3 south becomes MD Rt 301 South. Same as above.
Once you enter the park via W. Marlton Road (from Route 301 South), drive back a short distance, turn right at the fork and continue back to event parking (on your right and left as you enter the large clearing). There will be directional signs on the day of an event and there is also a small island with state park signs at the forked turn. If you miss the turn and go straight, do not panic. This exit will put you back on Route 301 South. It will then be necessary to do a U-Turn and come back to the first entrance. Please note the entrance and exit are One-Way only for your safety.