Counselor preparation is multifaceted and involves developing trainees’ clinical knowledge, skills and competence. Furthermore, counselor self-efficacy is a relevant developmental consideration in the counseling field. Therefore, the purpose of this longitudinal investigation was to examine the effects of a counselor preparation program on students’ development of counseling self-efficacy. The Counselor Self-Efficacy Scale was administered to 179 master’s-level counselors-in-training at three points in their counselor training and coursework, including new student orientation, clinical practicum orientation and final internship group supervision meeting. Findings indicated that students’ experience in their preparation program resulted in higher levels of self-efficacy.