The current study evaluated bidirectional associations between mother and father positive parenting and child effortful control. Data were drawn from 220 families when children were 3, 4, 5, and 6 years old. Parenting and effortful control were assessed when the child was 3, 4, and 5 years old. These variables were used to statistically predict child externalizing and school performance assessed when the child was 6 years old. The study used random intercept cross-lagged panel models to evaluate within-person and between-person associations between parenting and effortful control. Results suggest that prior positive parenting was associated with later effortful control, whereas effortful control was not associated with subsequent parenting from ages 3 to 5. Stable between-child differences in effortful control from ages 3 to 5 were associated with school performance at age 6. These stable between-child differences in effortful control were correlated with externalizing at age 3.