The November Project™ (NP) is a non-profit organization that hosts no-cost outdoor group workouts in 52 cities around the world. NP has the goal of increasing adult participation in the workouts, but also providing the social network and motivation to participate in physical activity experiences beyond NP. Our purpose was to use the Trans-Contextual Model of Motivation (TCM) as a theoretical basis to examine transfer of autonomous motivation for physical activity (PA) from NP workouts to other forms of leisure-time physical activity participation. Using a prospective research design, NP participants (N = 612) recruited via NP social media pages, completed two online questionnaires (Q1 & Q2) through Qualtrics software. In Q1 participants responded to items tapping their perceptions of autonomy support from NP leaders and autonomous motivation during NP workouts. Participants completed Q2 one month later comprised of items measuring autonomy support from significant others, autonomous motivation, theory of planned PA behavior and actual behavior within other leisure-time contexts. A single-indicator structural equation model revealed a good fit of the TCM proposal model with the data. Perceived autonomy support from NP leaders and peers predicted autonomous motivation in the NP context. Controlled motivation in NP context predicted controlled motivation in other leisure-time contexts (β = .619, p<.001) but autonomous motivation in NP had a small effect on leisure-time autonomous motivation. Importantly, perceived autonomy support from significant others predicted autonomous motivation, PA intention and behavior indirectly (total indirect effect β = .111, p < .001) within other leisure-time PA contexts. Autonomy support provided by NP leaders fosters participants’ autonomous motivation for PA. NP controlled motivation predicts controlled motivation for PA participation in other leisure-time contexts. Perceived autonomy support provided by significant others in other leisure time contexts is linked to PA intention and participation in those contexts.