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The purpose of this study was to examine the effectiveness of a vocabulary intervention designed to supplement research–based classroom vocabulary instruction, implemented with students who may be at risk for language and learning difficulties. Participants included 43 kindergarten students who received research–based classroom vocabulary instruction. Students with the 20 lowest scores on the Peabody Picture Vocabulary Test–III administered at pretest received additional small–group supplemental vocabulary intervention. Results of within–subjects comparisons indicated that, overall, at–risk students made greater gains in word knowledge on target words that received the supplemental intervention as compared to words that received only classroom–based instruction. In addition, at–risk students who received the supplemental intervention demonstrated word–learning gains that approached those of their peers who received classroom instruction alone. Implications along with limitations of the current study and directions for future research are discussed.