Patient harness systems (10) for an emergency cot (18) including a chest strap restraint (14), a thigh strap restraint (16), and a harness restraint (12) having a shoulder harness (20), a pelvis strap (22), and a pair of stabilizing straps (110). The harness restraint is mountable to the emergency cot via a plurality of quick release restraint buckles (54). Methods of securing a patient to the emergency cot using the patient harness system.