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Aims and objectives: To examine the joint effects of self and spousal frailty status on functional and mental health in Chinese older adults and determine whether such effects vary by urban versus rural residency. Background: Frailty is a clinical syndrome among old adults and would lead to adverse outcomes. However, studies on the interactive patterns of frailty status between spouses and the joint effects of such patterns on health outcomes are scarce. Design: Data were from the China Health and Retirement Longitudinal Study (CHARLS). A total of 2,581 married seniors who participated both 2011 and 2015 waves of the CHARLS were categorised into four groups: robust self–robust spouse (RR), robust self–frail spouse (RF), frail self–robust spouse (FR) and frail self–frail spouse (FF). Methods: Frailty was measured using the physical frailty phenotype scale. Depressive symptoms were measured using the Center for Epidemiologic Studies Depression Scale (CESD). Functional health was measured by difficulties in activities of daily living (ADL) and instrumental activities of daily living (IADL). The generalised estimating equation was used to estimate the effects of concordant frailty on mental and functional outcomes, stratified by rural/urban residency. This study followed the STROBE checklist. Results: The FF group reported higher levels of ADL/IADL difficulties and depressive symptoms at follow‐up than the RR group; urban individuals in the RF group reported higher follow‐up depression than the RR group; and rural individuals from the FR or RF groups reported more follow‐up ADL/IADL difficulties than the RR group. Conclusion: Frailty and subsequent health decline are interdependent in older couples, and the rural/urban context is important for understanding this interdependence in the older Chinese population. Relevance to clinical practice: Couples‐based intervention strategies are needed to tackle situations in which one or both spouses are concurrently facing frailty. [ABSTRACT FROM AUTHOR]