The present study examined associations between sociocultural factors and self‐regulation (parent‐report, teacher‐report, laboratory tasks), and prospective relations between self‐regulation and behavioral adjustment (parent‐, teacher‐, child‐report) in a socioeconomically diverse sample of Chinese American children in immigrant families (N = 258, Wave 1 age = 6–9 years, Wave 2 age = 9–11 years, 52% boys, 57% low‐income) in a longitudinal study (2007–2011) during early elementary school years. Family income uniquely related to a self‐regulation latent factor ( = .22), and parent–child Chinese orientation gaps were associated with parent‐reported effortful control ( = .40). Self‐regulation at W1 negatively predicted parent‐ and teacher‐reported behavioral maladjustment ( = −.22 and −.48) at W2, controlling for cross‐time stability of both constructs and covariates (child sex, parental education).