visit : https://www.graceland.com/visit/plan_your_visit/hours.aspx
There is a special period of time for free-admission walk-up visits to the Meditation Garden at Graceland, where the grave sites of Elvis and members of his family are located. Visitor walk-up times are daily from 7:30 a.m. – 8:30 a.m. All guests must enter the gates by 8:30 a.m. to walk-up, and all guests must exit the mansion grounds prior to the start of Graceland tours. There are no walk-ups on Thanksgiving Day and Christmas Day. Please note that walk-up hours may be adjusted at any time due to the needs of the property.