Rosaryville State Park

Mount Airy Mansion in Rosaryville State Park



Prince George's County

Rosaryville State Park
7805 West Marlton Avenue
Upper Marlboro, MD 20772​
Contact: 301-888-1410​

Hours: Park is Open 8 a.m. to sunset. All vehicles must exit the park before the gate closes at sunset. If locked in, call Park Watch at 1- 800 825 7275.

Calendar of Events​​​


Rosaryville is a 1227​ acre day-use park with miles of trails for hiking, biking and equestrians. 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.​ The park is also the location of the historic Mount Airy Mansion. Parties, great and small, weddings, births and visits from seven presidents have left their mark, lending a wonderful feeling of expectancy to this lovely old home. 

The day use service charges are collected at the automated gate system at the entrance payable via credit or debit or cash (exact change only). Passholders (Maryland Passport, Golden Age and Universal Disability) may contact the park by email ( or the Duty Ranger at 443-975-4358 to receive a swipe card that allows free entry through the automated gate system.

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