California’s school start time law, Senate Bill 328, bars public high schools from beginning the schoolday before 8:30 a.m. and public middle schools from beginning before 8:00 a.m. The rule is codified at Education Code Section 46148, covers charter schools as well as traditional public schools, and has been fully in effect since July 1, 2022.1California Legislative Information. California Education Code EDC 46148
The Two Minimum Start Times
Section 46148 sets floors, not targets. High schools, including charter high schools, cannot begin the schoolday before 8:30 a.m. Middle schools, including charter middle schools, cannot begin before 8:00 a.m.1California Legislative Information. California Education Code EDC 46148 Districts may set later start times if they choose. Elementary schools are not covered at all. For a K–8 campus, which time applies depends on how the district classifies the middle grades.
Which Schools Are Covered
The mandate reaches all public middle schools (generally grades six through eight) and public high schools (grades nine through twelve), and it expressly includes schools operated as charters.2California Legislative Information. California Education Code 46148 – Pupil Attendance: School Start Time Private schools are not subject to the law.
Rural school districts are exempt.1California Legislative Information. California Education Code EDC 46148 The original statute did not define “rural,” which left some ambiguity at the edges. Follow-up legislation, SB 1125, signaled the Legislature’s intent to formalize a definition of “rural school district and rural charter school” for this section. The exemption itself has been in place from the start, and the rationale is transportation: long bus routes in geographically large districts can push pickup times so early that a later bell would erase the health benefit.
Zero Periods and Optional Before-School Activities
The statute defines “schoolday” as the time a school uses to calculate average daily attendance, the metric that drives state funding.1California Legislative Information. California Education Code EDC 46148 That definition creates a specific carve-out. A school can hold optional classes or activities before the official start time, so long as those sessions don’t count toward average daily attendance and aren’t required of all students.
Zero periods are still allowed under that rule. A high school can offer an elective or an athletic training session at 7:00 a.m. without breaking the law, provided the period is truly voluntary and isn’t counted for state funding. The concern with this carve-out is that a school could use a “voluntary” zero period to keep the real academic day starting early. The statute tries to head that off by tying the restriction to the attendance-based funding clock rather than the moment students arrive on campus.
What To Do if a School Starts Too Early
Section 46148 contains no penalty clause, no fine schedule, and no explicit enforcement mechanism against a district that ignores it. Subsections (e) and (f) read as encouragements: the California Department of Education is “encouraged” to post sleep research on its website, and schools are “encouraged” to inform their communities about the health effects of sleep deprivation.1California Legislative Information. California Education Code EDC 46148
If your child’s school starts earlier than the law allows, the most direct step is raising the issue with the school board. California’s Uniform Complaint Procedures allow written complaints alleging violations of state education law, which could potentially cover a start-time violation, though the statute itself doesn’t reference that process. Compliance so far has come mostly from district-level adoption rather than formal enforcement.
When the Law Took Effect
Governor Newsom signed SB 328 on October 13, 2019, and it took effect as a statute on January 1, 2020.2California Legislative Information. California Education Code 46148 – Pupil Attendance: School Start Time Schools had until July 1, 2022, to comply, or until the expiration of any collective bargaining agreement in effect on January 1, 2020, whichever came later.1California Legislative Information. California Education Code EDC 46148
That grace period mattered. Changing start times affects teacher schedules, bus driver shifts, custodial staff, and after-school programs, and districts couldn’t unilaterally rewrite working conditions mid-contract. By the 2022–2023 school year, most districts had adjusted their bell schedules to fit the new floors.