Dual credit courses are legislated course enrollment options available to ninth- to twelfth-grade students in the State of Texas. The dual credit program provides the opportunity for all high school students, regardless of grade level, to earn college credits while working toward a high school diploma (Houston ISD, 2018). There is no limit to the number of dual credit courses or hours students can take in a single semester or school year (Houston ISD, 2018). Dual credit is offered in several instructional and program arrangements, including international baccalaureate, advanced placement, and articulated postsecondary courses designed for advanced technical credit in the Houston Independent School District (HISD). The purpose of the evaluation was to determine the effect of dual credit enrollment on the academic performance of HISD students using results from the 2019 State of Texas Assessments of Academic Readiness (STAAR) Algebra I, Biology, English I, English II, and U.S. History End-of-Course (EOC) assessments. Scale scores for dual credit and non-dual credit students were subject to treatment effects with regression adjustment to determine dual credit effects. The percentage of dual credit students relative to their non-dual credit peers who met the Approaches Student Standard was provided and disaggregated by key demographic and educational variables. Multiple regression was used to determine key demographic and educational predictors of performance on the STAAR EOCs.