ABSTRACT Objective The COVID-19 pandemic declared in early 2020 led to the closure of Australia’s international borders and the stranding of thousands of Australians overseas. We surveyed “stranded” Australians pre- and post-repatriation to evaluate their stress-coping responses at the time and the longer-term impacts of their experience. Method Stranded Australians (n = 587; 18–70 years of age; M = 40.15, SD = 11.90) completed a survey measuring COVID-19 impact, stressor appraisal and coping strategy, and psychological adjustment, and 203 of them completed a follow-up survey of psychological adjustment and posttraumatic stress disorder (PTSD) symptoms post-repatriation. Results Path analysis showed that “primary” appraisals of the repatriation situation (i.e. as a threat or challenge) were positively associated with negative affect, use of avoidant coping, and poorer psychological adjustment. Although the follow-up survey revealed improvements in psychological adjustment, initial use of avoidant coping was associated with higher levels of PTSD post-repatriation. Conclusion Primary appraisals and avoidant coping were associated with poorer psychological adjustment and longer-term PTSD symptomatology. The results highlight the need for ongoing mental health support for repatriated Australians and call for higher prioritisation of practical and mental health support in the event of future border closures.