This robust mixed-methods study examines ninth-grade advanced course placement in Arkansas, revealing disparities rooted in race and socioeconomic status. Utilizing a logit analysis for a five-year pooled sample (n = 163,616), we find persistent enrollment gaps for Black ninth-grade students after controlling for prior academic achievement, highlighting systemic barriers to access to advanced courses. Socioeconomic divides are also evident in our analysis. Qualitative findings from counselor interviews highlight the importance of parental involvement in course placement decisions, particularly for students from lower socioeconomic backgrounds. Overall, we find through these interviews that districts consider a myriad of factors when considering course placement for ninth-grade courses. We recommend systemic changes for districts, including local norm-based placement systems and automatic enrollment policies to enhance fairness in advanced course placement.