SACRAMENTO (CBS13) – California may need to spend hundreds of millions of dollars in order to offer full-day kindergarten in every school district in the state.

Assembly Bill 197 would require every school to offer at least one full-day kindergarten class starting in the 2022-23 school year. The only exception would be for schools that lack the space and need to continue operating half-day kindergarten.

The bill passed the full Assembly Monday with a 61-15 vote (three Assemblymembers did not vote). It now goes to the Governor’s desk. In 2014, Governor Jerry Brown vetoed a similar proposal, saying he preferred “to let parents determine what is best for their children, rather than mandate an entirely new grade level.” In California, students aren’t required to attend school in the state until first grade.

The Senate Appropriations Committee said if AB 197 is signed into law,

“”This bill could result in additional Proposition 98 General Fund costs in the tens of millions to hundreds of millions of dollars for increased staffing, purchasing of materials, additional classroom space, and school facilities construction costs as a result of this measure. These costs may be determined to be reimbursable by the Commission on State Mandates, but could be offset by the full-day kindergarten facilities funding included in the budget.”

The 2018-19 budget provided $100 million for kindergarten facility grants, and the 2019-20 budget earmarks an additional $750 million for the same purpose.

As of 2017, 71 percent of school districts statewide require kindergarten students to go to class for a full day. An additional 10 percent operate a mix of full- and part-time programs. About 19 percent of districts statewide offer only part-day Kindergarten.

According to the bill’s author, “Full-day kindergarten programs close achievement gaps between young children from minority and low-income families and their peers who reside in more affluent areas. By providing a solid foundation of learning to children from all backgrounds, full-day kindergarten programs ensure all students’ academic, social, and emotional success.”

However, the bill analysis cites two studies that do not necessarily show a benefit to full-day programs.

“A 2009 Public Policy Institute of California study states that ‘research to date…has provided little evidence of long-term academic benefits beyond kindergarten or first grade.’ Further, an analysis was done by the Research and Development (RAND) Corporation titled ‘Ready for School: Can Full-Day Kindergarten Level the Playing Field’ found that ‘This study reinforces the findings of earlier studies that suggest full-day kindergarten programs may not enhance achievement in the long term. Furthermore, this study raises the possibility that full-day kindergarten programs may actually be detrimental to mathematics performance and to nonacademic readiness skills.’

Schools with half-day kindergarten often offer a morning and afternoon session, which uses the same classroom, often with a different teacher. When surveyed by the Legislative Analyst’s Office, districts offering only half-day, or a mix of half- and full-day kindergarten, gave a number of reasons for not offering full-day only programs: limited classroom space, teachers preferring part-day programs, and parent preference.

In order to address the lack of space many of these schools would have if they were to switch to a full-day kindergarten program, the bill states: “full-day kindergarten must be a priority for school districts and reserving or obtaining space for the full-day kindergarten program must take precedence over all non-class requirements.”

Thirteen states, plus the District of Columbia, require full-day kindergarten.