This study examines infant temperament (inhibited and uninhibited styles) as a predictor of behavior in the kindergarten classroom. Thirty-one kindergarten children were observed in their classrooms for approximately 1.5 hours on each of four occasions between September and January. Fourteen children (8 girls, 6 boys) had been classified as high reactive at 4 months of age and inhibited at 14 and 21 months; 17 (7 girls, 10 boys) were low-reactive at 4 months, and uninhibited at 14 and 21 months. Modest evidence for continuity in temperament was found, and, as predicted, differences were most apparent for classroom behaviors that might be stressful for socially inhibited children. The results show some differences between girls and boys and describe trends in classroom behavior as children make the transition to kindergarten. These findings identify temperament as a factor that influences children's adjustment to kindergarten and contributes to a body of work that identifies early risk factors for later behavioral problems. (Contains 4 tables and 1 figure.)