Field-based practicum experiences are essential in connecting classroom theory to the real world. In this mixed methods study, we analyzed principal candidates' perceptions of their summer residency practicum experiences via a self-assessment principal leadership competency instrument and virtual semi-structured interviews. We found that principal candidates expressed leadership growth in the following Texas principal leadership competency areas: Strategic Operations, Human Capital, and Executive Leadership. These findings were consistent in our quantitative and qualitative data analysis. Conversely, the principal candidates stated that their greatest leadership challenges during the summer residency practicum involved providing instructional feedback and engaging in difficult conversations. The results of this study may assist principal preparation programs in revamping their curriculum to include a more meaningful residency-practicum experience.