The current study used the transtheoretical model (TTM) as a guiding theoretical framework to assess differences in processes of change, decisional balance, and self-efficacy among deaf individuals with different levels of physical activity. Overall, 146 participants (M age = 26.4 yr, SD = 4.28) completed anonymous questionnaires assessing the dimensions of the TTM, stages of change, processes of change, decisional balance, and self-efficacy. Analysis of variance showed that both experiential and behavioral processes of change were higher in the preparation, action, and maintenance stages than in the other stages. Accordingly, the benefits of physical activity participation were stronger in the preparation stage, whereas the costs were more evident in the precontemplation stage. Finally, self-efficacy at the preparation stage was higher than in the other stages. The findings revealed how different stages of physical activity participation can be explained through the TTM, and the implications for physical activity intervention are discussed.