 Methods: Design and Participants-A feasibility RCT with an embedded qualitative component is proposed with 18 participants. Ambulatory older adults living in the community who report walking outdoors 20 minutesweek will be stratified by level of walking impairment gait speed0.8 ms vs 0.8 ms and randomly assigned to receive the GO-OUT program or the workshop alone. Group allocation will be concealed. A blinded evaluator will evaluate participants at baseline, 3 and 6 months. At 6 months, focus groups of participants from the GO-OUT and workshop groups and intervention facilitators, will participate in a semi-structured interview to explore perceived benefits and challenges of adherence, intervention strategy and outcome measures. Interventions-The workshop will include activity stations at which people will learn about appropriate footwear, walking aids and equipment pedometers, Nordic poles, goal setting, physical activity recommendationsbenefits and practice walking-related tasks. The GO-OUT program will include the workshop plus the outdoor walking group. The walking group will be supervised and consist of 9 participants; they will meet twice a week for 1 hour to walk in increasingly challenging environments to achieve individualized goals. Outcome Measures-Outdoor walking primary outcome will be measured by 2 methods: outdoor walking items of the Community Health Activities Model Program for Seniors CHAMPS self-report and accelerometerGlobal Positioning System GPS. Overall physical activity secondary outcome will be measured with the CHAMPS self-report as well as accelerometry. Measures of aerobic capacity, walking competency, mood, participation, and HRQL will also be administered. Neighbourhood walkability will be assessed with the Neighbourhood Environment Walkability Scale self-report. Analysis-This is a feasibility study; therefore, no hypotheses will be tested. The analysis will include describing participant characteristics, estimating recruitment, withdrawal and adverse event rates, estimating preliminary effect sizes for outcome measures, estimating test-retest reliability of outdoor walk time derived from the CHAMPS and construct validity and data completeness of outdoor walk time derived from the CHAMPS and accelerometryGPS. A qualitative descriptive approach will be used to analyse the interview data. Conclusion-Increasing outdoor walking is expected to help people improve physical activity, the ability to live independently in the community, and health and well-being. This study will evaluate the feasibility of a trial protocol aimed at improving outdoor walking. Findings will be used to justify and inform planning of a future definitive multi-site trial. 