Strong communication skills are important in an individual's personal and professional life; however, research regarding what influences youth's public speaking self-efficacy is limited. To address this gap, we surveyed youth who participated in a statewide presentation event about their self-efficacy and sources of that self-efficacy. Results show mastery experiences have the greatest relationship to youth's public speaking confidence. Extension can strengthen youth's public speaking self-efficacy by increasing the number of presentation opportunities and by removing barriers from participating in existing presentation opportunities.