Prince George's County
Merkle Wildlife Sanctuary11704 Fenno RoadUpper Marlboro, MD 20772
Grounds open sunrise to sunset/
Frank Oslislo Visitor Center: Open weekends 10 a.m. to 4 p.m.
Critical Area Driving Tour: The CADT is open for driving, hiking, biking, and horseback riding daily. The portion of the driving tour connecting Patuxent River Park to Merkle Wildlife is open Sundays, year round, from 10 a.m. to 3 p.m.
Leashed pets are permitted at Merkle Wildlife
580 Taylor Ave, Annapolis MD 21401