The aim of this article is to demonstrate “mentoring through service‐learning” models can be powerful avenues to support the development of emerging adult practitioners, and are scalable to new global contexts when careful attention is paid to the local culture and evidence‐based principles for mentoring and service‐learning. The study presents outcome findings for mentors who participated in Campus Connections Aotearoa, a culturally translated version of a US‐based service‐learning experience and therapeutic youth mentoring program implemented in New Zealand, based on a mixed‐method, pre‐post evaluation survey involving 62 ethnically diverse mentors (81% female). A large, significant increase in mentoring self‐efficacy and small to moderate significant increases for attunement to others, sociability and leadership, and problem‐solving and perspective‐taking were found. Open‐ended survey responses revealed self‐reported changes in both personal and professional growth. The discussion highlights the importance of theory and evidence‐driven design decisions and an intensive evidence‐informed training curriculum for mentoring‐based service‐learning programs.