Female partners of men with prostate cancer (PCa) experience heightened psychological distress; however, long-term distress for this group is not well described. We examined partner's psychological and cancer-specific distress over 2 years and predictors of change.A cohort of 427 female partners (63% response; mean age 62.6 y) of PCa survivors completed baseline (2-4 y post-PCa treatment) assessments of anxiety, depression, and cancer-specific distress and were followed up at 6, 12, 18, and 24 months. Caregiver burden, threat and challenge appraisal, self-efficacy, and dyadic adjustment were assessed as potential predictors of distress.Over time, 23% to 25% of women reported anxiety; 8% to 11% depression; 5% to 6% high cancer-specific distress. Higher caregiver burden and more threat appraisals were associated with increased distress, anxiety, depression, and cancer-specific distress over time. Higher dyadic adjustment over time and more challenge appraisals at 24 months were associated with less distress, anxiety, and depression. Increased partner self-efficacy was associated with lower distress and depression at baseline.A substantial subgroup of partners experience ongoing anxiety, with depression less prevalent but also persistent. Caregiver burden, partner self-efficacy, threat, and challenge appraisals present as potential supportive care targets.