Despite growing numbers in the USA, immigrant populations are underrepresented in existing physical activity (PA) research, in particular Muslim immigrant women. The current study is a pilot evaluation of a culturally adapted evidence-based PA intervention for adult Somali women. Stratified randomization was used to assign participants from a sample of 27 Somali women, aged 18 to 65, to a PA group or a waitlist control group. Bicultural Somali community research team members delivered a 12-week culturally adapted intervention available in English and Somali in a community-based setting. Process and outcome evaluation assessed changes in PA, self-efficacy for PA, access to PA resources, and wellbeing as well as feasibility and satisfaction with the program. Participants in the PA group increased their moderate to vigorous PA significantly more than those from the waitlist group from baseline to post-intervention (2 (SD = 15) to 100 (SD = 53) vs 12 (SD = 21) to 32 (SD = 44) minutes per week). Participants in the PA group had significantly greater scores in wellbeing at post-intervention compared to the waitlist group though there was no significant change from pre- to post-intervention for either group. Participants reported a high level of satisfaction with the program and preliminary evidence supports the general feasibility and acceptability of the program. Findings show that a culturally adapted intervention increased engagement in PA and was feasible and acceptable within a pilot sample of Somali women.