Recent studies have emphasized the importance of applying positive psychological theories in the context of career development (Hull et al., 2020; Vela et al., 2015, 2019). However, limited research has been carried out on how specific positive personality traits might contribute to optimal career functioning. We addressed this gap by exploring the link of a triarchic model of grit dimensions (i.e., perseverance of effort, consistency of interests, and adaptability to situations) to career maturity, career decision‐making self‐efficacy, and career goal setting among Hong Kong Chinese secondary school students. Perseverance of effort positively predicted career goal setting and career decision‐making self‐efficacy. Consistency positively predicted career goal setting and career maturity. Adaptability to situations positively predicted career maturity, career decision‐making self‐efficacy, and career goal setting. Results point to the importance of designing school‐based grit interventions to facilitate optimal career‐related functioning.