This explanatory mixed-methods study began with a quantitative survey to investigate counselor beliefs and implementation behaviors related to providing college and career planning services to high school students. Survey results informed the development and implementation of interview protocol designed to provide deeper insight into counselors' decision-making and implementation fidelity. Findings revealed that while counselors place substantial value in state and district policies, and believe their implementation decisions connect student interests and postsecondary goals to appropriate high school programs of study, they spend more time assisting students of higher socioeconomic status with college planning, resulting in less time for supporting students more likely to need their specialized assistance. Implications for educational leaders are discussed.