We provide data 3 to 4 years postintervention for four samples of English language learners from two sequential Grade 1 cohorts who received supplemental Grade 1 reading interventions in Spanish or English and for whom the language of instruction for intervention was matched with language of core reading instruction. Participants were 300 students at risk for reading difficulties who were randomly assigned to intervention or comparison groups; there were 186 students from the four samples assessed in both languages (Spanish, English) 3 or 4 years after intervention completion (Spring Grade 4 or 5). Findings from the Spanish study revealed few statistically significant differences in favor of intervention students on Spanish measures, although effect sizes generally favored this group (median d = +0.33). Findings from the English study also revealed few statistically significant differences in favor of intervention students, though again, effect sizes were positive (median d = +0.23). Transfer effects were generally small, though nearly all were positive. Although the effects were small, receipt of intervention in Grade 1 was associated with clinically significant gains in a variety of literacy-related domains 3 to 4 years after the termination of supplemental instruction. (Contains 5 tables and 3 figures.)