The use of oral reading fluency (ORF) as a predominant measurement tool for identifying struggling readers has grown exponentially over the past 30 years. ORF growth using curriculum-based measures (CBM) has also become an important practical and empirical issue influencing the field. Although fluency scores have shown to be reliable predictors of reading performance up through middle school for poor readers, the point at which assessments of ORF fail to provide additional information is currently unknown. The purpose of our paper was to explore a range of fluency scores at which ORF growth plateaus as a potential guide to educators and researchers for ceasing ORF assessments. Results showed that the growth trajectory sharply increased in Grades 3-5, whereas the growth trajectory slightly increased from Grade 5 to Grade 6. The plateau range of ORF scores was 137.72-170.94 words read correctly per minute (wcpm). Grades 7 and 8 data are needed to further investigation as we found the time point for peak growth was beyond our current data.