Rapid automatized naming (RAN) tasks have been shown to be a strong correlate of reading abilities. RAN also predicts future reading across different ages, ability levels, and languages, and is often used in literacy screening. Thus, understanding the specific relations between early RAN and later reading difficulties is important. In this systematic review and meta-analysis (with N = 68 samples; k = 373 effect sizes; n = 10,513 participants), we test the extent to which measures of RAN assessed before grade school predict later reading performance in English-speaking children. We also test whether characteristics of the RAN tasks, reading measures, or sample demographics moderate this relationship. We found that kindergarten/preschool RAN is correlated with grade-school reading at r = -.38, similar in magnitude to previous meta-analyses that included various ages and languages. We found that alphanumeric RAN tasks are particularly strongly related to future reading, as compared with non-alphanumeric tasks (p = .01) but that other features of the RAN task, such as the number of items, do not alter its predictive significance. RAN predicts all types of reading measures, but more strongly predicts real word than nonword reading (p < .001). These results support a shared cognitive resource model in which the similarity between RAN and reading tasks accounts for their correlation. We provide practical guidelines based on these data for early screening for reading difficulties and dyslexia.