Transitional kindergarten (TK) provides a valuable opportunity to prepare children for success in school, offer additional early learning choices for families, and start narrowing achievement gaps in school districts. This brief explores an additional local option, known as "Expanded TK," to prepare more 4 year olds for kindergarten. Specifically, it discusses ways in which school districts can make use of state funding for TK to support school readiness for children whose 5th birthdays fall after the TK eligibility window (birthdays between Sept. 2 and Dec. 2), under newly approved statutory language. (author abstract)