Greenbelt Park is officially open 365 days a year. The park headquarters and park ranger station are offically closed on Christmas Day and New Years Day. Any emergencenies should be directed to the U.S. Park Police at the entrance of the park or by calling 301-344-4250. Campground hosts will be in the campground for the campground visitors. The staff of Greenbelt Park wishes everyone a happy and healthy holiday season.