Immigrant educational selectivity—immigrant parents' educational attainment relative to their peers who did not migrate—is associated with better schooling outcomes for children at later stages of the educational pipeline in the United States. Less is known, however, about its influence on early education‐related outcomes. Using Early Childhood Longitudinal Study data from three different cohorts and quantitative analyses, I examine the relationship between immigrant selectivity and school readiness at school entry (proxied through math skills and approaches to learning evaluations). I find that immigrant selectivity is positively associated with school readiness, but it does not generate a widespread immigrant advantage at school entry, contrary to findings related to schooling outcomes later in the schooling pipeline. Notably, among most Asian groups, immigrant selectivity partly accounts for school readiness advantages compared to their White peers with native‐born parentage, whenever they emerge. By contrast, accounting for immigrant selectivity reveals the full extent of the immigrant disadvantage at school entry among most Latino groups. These results suggest that immigrant selectivity is an important factor in shaping racial/ethnic stratification early in the schooling pipeline.