We use admis­sions lot­ter­ies to esti­mate the effects of large-scale pub­lic preschool in Boston on col­lege-going, col­lege prepa­ra­tion, stan­dard­ized test scores, and behav­ioral out­comes. Preschool enroll­ment boosts col­lege atten­dance, as well as SAT test-tak­ing and high school grad­u­a­tion. Preschool also decreas­es sev­er­al dis­ci­pli­nary mea­sures includ­ing juve­nile incar­cer­a­tion, but has no detectable impact on state achievement […]