Within a Response to Intervention (RtI) framework, Tier 1 instruction requires the selection of research-based core curricula. However, many educators and administrators are not aware of high-quality core writing curricula. The authors assembled a rubric to assist schools in evaluating core writing curricula for Grades 3-5. Rubric components included: alignment with the Common Core State Standards for Written Language and the Institute of Educational Sciences' current recommendations for teaching elementary school writing; an evaluation of the curricula's scope and sequence, feedback procedures, and assessment procedures; an examination of available teacher resources; and research evidence. Four standalone writing programs were reviewed using the rubric. Curricular materials were examined for their adherence to each criterion and were rated as "strong," "adequate," or "weak." This review indicated that many writing program have the potential for use in Tier 1. However, these programs have not been evaluated empirically. Directions for future research with elementary school-level writing curricula are discussed.