Objectives To describe the prevalence and trajectory of family caregivers' post-traumatic stress symptoms during the first year after a patient's admission to the intensive care unit and identify associations between family caregivers' background characteristics, hope and post-traumatic stress symptoms. Research methodology/designs Family caregivers of intensive care unit patients (n = 211) completed questionnaires at patient admission to the intensive care unit and thereafter at 1, 3, 6, and 12 months. Mixed-model analyses were performed.