How Many Weeks Are in a School Year in Michigan?

A Michigan public school year runs about 36 weeks. State law sets the floor at 180 days and 1,098 hours of pupil instruction, and the calendar cannot start before Labor Day, so how many weeks are in a school year in Michigan depends on how a district spaces those 180 days between early September and the following June.¹

Divide 180 instructional days by a standard five-day week and you get 36 weeks of classes. Add the built-in breaks most districts schedule around Thanksgiving, winter holidays, and spring, and the calendar itself typically stretches across roughly 40 calendar weeks from opening day to the last day of school.

The 180-Day and 1,098-Hour Minimums

Every Michigan public school district must deliver at least 1,098 hours and 180 days of pupil instruction per school year.¹ Both thresholds have to be met independently. A district that schedules 180 days but falls short on cumulative hours still violates the requirement, and a district that hits the hour count early still has to reach day 180.

The dual standard is why bell schedules matter to the week count. A district with shorter school days needs the full 180 days plus some cushion to reach 1,098 hours. A district running longer days can meet the hour floor with room to spare, but the day count still fixes the length of the year at 36 instructional weeks minimum.

The Labor Day Start Rule

Michigan law prohibits public school districts and public school academies from beginning their school year before Labor Day.² That single rule shapes the entire calendar. With classes starting the Tuesday after Labor Day and ending in early to mid-June, districts have to fit 180 days plus holidays and breaks into about a nine-month window.

A few programs are exempt. Year-round schools operating as of September 29, 2005 were grandfathered in, and districts that started year-round programs later can apply to the Superintendent of Public Instruction for a waiver granted when the program is a genuine year-round school established for educational reasons. International Baccalaureate academies providing at least 1,160 hours of instruction per year were also exempted.²

What Counts Toward the Hours

Not every minute in a school building counts toward the 1,098-hour minimum, and that affects how districts distribute time across the 36 weeks.

Time That Does Not Count

Hours or days lost to teacher strikes and teacher conferences cannot be counted as pupil instruction.¹ Study halls are generally excluded, though up to two study halls totaling no more than 90 additional hours may sit in a student’s schedule without penalty if the required instructional hours are already there.

Professional Development That Counts

Districts may count up to 38 hours of teacher professional development as pupil instruction hours. When a professional development session runs longer than five hours in a single day, that entire day can also count as a day of pupil instruction.¹ At least eight of those 38 hours must be recommended by a districtwide professional development advisory committee made up mostly of teachers, and the training itself must align with the school or district improvement plan and be approved by the Michigan Department of Education for continuing education credit. Online professional development qualifies when the district approves it.

Snow Days and a Year That Runs Longer

Michigan winters make emergency closures a near-certainty for most districts, which is why the calendar year sometimes stretches past its planned end. Days lost to conditions beyond a district’s control are handled through a combination of forgiveness provisions and makeup days. When a district would otherwise fall below the 180-day minimum, it may add instructional days to the end of the calendar.¹ The normal restriction that keeps districts from scheduling instruction past a late-June date does not apply to those makeup days.

Districts that build buffer days into their calendars from the start absorb snow closures without extending into summer. Those that cut it close end up adding weeks in June.

Four-Day Weeks and Other Alternative Calendars

Some districts operate on schedules other than a five-day, 36-week year. The waiver provision in subsection (9) of Section 101 covers department-approved alternative education programs and innovative programs, including four-day school weeks.¹ A district that receives a waiver and complies with its terms will not face any funding forfeiture for the program covered.

Waivers for blended-delivery programs remain in effect unless revoked by the Superintendent. Waivers for fully online programs that make at least 1,098 hours of educational services available and keep students on track for proficiency-level course completion also remain in effect unless revoked. All other waivers last three years and must be renewed.¹ A four-day-week district still delivers roughly the same total hours; the weeks just get longer and there are more of them on the calendar.

Homeschools and Private Schools

The 180-day and 1,098-hour requirements apply to public school districts and public school academies. They do not apply to homeschooling families. Michigan’s compulsory attendance law requires children to attend school from age 6 through their 18th birthday, but it exempts children being educated at home by a parent or legal guardian in an organized educational program covering reading, spelling, mathematics, science, history, civics, literature, writing, and English grammar. There is no minimum number of days, hours, or weeks that homeschooling families must log. Children attending state-approved nonpublic schools are similarly exempt, provided the school teaches comparable subjects to those in the public school curriculum for the relevant age and grade level.³

Why the Week Count Is Enforced

Michigan funds its public schools primarily through a per-pupil foundation allowance under the State School Aid Act. For the 2025–2026 fiscal year, the foundation allowance is $10,050 per pupil.⁴ A district that fails to meet the 180-day or 1,098-hour threshold faces a proportional forfeiture of state aid tied to the size of the shortfall. The reduction is calculated mechanically, not at the state’s discretion, which is why 36 instructional weeks is not just a norm but a floor every district builds around.

1
Michigan Legislature. Michigan Compiled Laws 388.1701
2
Michigan Legislature. Michigan Compiled Laws 380.1284b
3
Michigan Legislature. Michigan Revised School Code Part 24 – Section 380.1561
4
Michigan House Fiscal Agency. FY 2025-26 Budget Briefing School Aid