Reading comprehension rate (RCR) is a direct measure of reading skills that may be useful in formatively evaluating students reading beyond the fourth-grade level. To investigate the concurrent validity of RCR, we correlated RCR, reading comprehension level (RCL), and words correct per minute (WC/M) with the Broad Reading Cluster Scores of the Woodcock-Johnson III Tests of Achievement (WJ-III ACH) across 88 students in 4th, 5th, and 10th grades. Results showed that aloud-RCR was significantly correlated with the WJ-III ACH scores for 4th-grade (r = .90; n = 22), 5th-grade (r = .87; n = 29), and 10th-grade (r = .65; n = 37) students. Regression analysis specified a one-predictor model for 4th-grade students (aloud-RCR), a two-predictor model for 5th-grade students (WC/M and aloud-RCR), and a one-predictor model for 10th-grade students (WC/M). Discussion focuses on directions for future research and applied issues related to RCR probe passage development. © 2007 Wiley Periodicals, Inc. Psychol Schs 44: 373–388, 2007.