This study examined whether oral reading fluency in a child's first language (Spanish) as assessed by Curriculum-Based Measurement (CBM) was related to oral reading fluency in a second language (English) and whether Spanish oral reading fluency probes administered in the fall were predictive of English oral reading fluency outcomes for spring of the same academic year. A total of 68 bilingual education students across grades 1 through 5 were assessed in Spanish and English during the fall, winter, and spring. Results showed that reading in Spanish and English across grades and time periods correlated moderately high with the exception of fourth grade. In addition, Spanish oral reading fluency at the beginning of the year significantly predicted English reading outcomes at the end of the year. These findings suggest that CBM can be a valuable tool for evaluating the relationship between oral reading fluency in both the first and second language. (Contains 3 tables and 1 footnote.)