To aid in understanding preschoolers' self-regulation and refinement of measurement, we examined properties of a field-based assessment battery of preschooler's self-regulation, the Preschool Self-regulation Assessment (PSRA). The PSRA, which includes seven age-appropriate tasks that tap children's executive control, was administered to 313 preschoolers and then to 261 of these children approximately 3?months later. Teachers reported on children's school readiness (social competence and classroom adjustment) at the end of preschool and kindergarten years, and on academic success in kindergarten. PSRA tasks were examined for ceiling effects at 35-65?months; Pencil Tap, Balance Beam, Toy Wrap and Snack Delay were retained for lack of such effects. Confirmatory factor analyses showed two components at each time point--hot and cool executive control--and cross-time correlations showed significant stability of individual differences. Four-year-old girls and children of higher socioeconomic status outperformed 3-year-old boys and those at socioeconomic risk. Children, especially girls, scored higher on hot executive control. Finally, aspects of executive control differentially predicted teacher-reports of school readiness at both times of assessment, with age, gender and risk status controlled. These selected PSRA tasks, as a shortened battery, have potential for research and applied usage, and findings speak to theoretical understanding of preschoolers' self-regulation.