Walking for transportation is associated with health benefits. Minimal theory-based research has examined social cognitive and environmental predictors. This study examined social cognitions (self-regulatory efficacy to plan/schedule and overcome barriers; distance and travel time cognitions) and an environmental factor (proximity) as predictors of walking for transportation. Participants (n = 105) were university students, faculty, and staff, living within a walkable distance to campus. Social cognitions and proximity measures were completed at baseline, followed by walking for transportation to/from the campus over 2 weeks. A hierarchical multiple regression analysis predicted walking (R2adjusted = .55; p < .05). Self-regulatory efficacy to plan/schedule and overcome barriers were independent predictors (p's < .01). Findings supported theoretical contentions that self-regulatory efficacy predicts walking for transportation.