Note: Utilities such as Mapquest and Yahoo! driving directions will advise you to take Ashburn Road and turn right on Shellhorn Road. This is a valid route to take, but please be advised that Shellhorn is unpaved.
From the Dulles Greenway: Use Exit 5, Claiborne Parkway Turn South on Claiborne Parkway (Towards Broadlands) Turn Left (East) on Broadlands Boulevard (the first traffic signal) and St. Theresa's will be the 2nd left after the Safeway and Chevy Chase Bank.
From Route 28 & Waxpool Road: Go west on Waxpool Road for about 6 miles (Do not turn off when 625 turns left. The road's name changes to Farmwell Road then Ashburn Farm Pkwy) The fourth traffic signal after 625 splits off will be Claiborne Pkwy. Take a left onto Claiborne Pkwy, (go underneath the Dulles Greenway), Turn Left onto Broadlands Blvd (the first traffic signal), and St. Theresa's will be the 2nd Left after the Safeway and Chevy Chase Bank.