Year-round school does not add days to the K-12 school year. A year-round school rearranges the usual 180 days so that students get shorter breaks spread across twelve months instead of one long summer. In a typical version, students attend for about nine weeks, take about three weeks off, and repeat that cycle through the year, with a summer break closer to five or six weeks than ten.
The pros and cons of year-round school are easier to weigh once the schedule is clear. For a district, the benefits can include relief for a crowded building, time for extra help during the year, and school meals and services available for more of the calendar. The drawbacks include questions about cost, staffing, child care, summer jobs and family schedules that a traditional calendar never had to answer.
The research is more modest than supporters often suggest. Students forget less over a shorter summer, but the strongest studies find they learn a little less during the rest of the year, and the total comes out about the same. Whether year-round school helps depends less on the calendar itself than on what a district does with the breaks.
What is the 45/15 school year plan?
The most common year-round school model is called 45/15: four blocks of 45 school days, each followed by 15 school days off. Other districts use 60/20 or 90/30 schedules, which keep the same idea with longer terms and longer breaks. The National Association for Year-Round Education has defined a year-round calendar as one with no break longer than eight weeks.
The breaks are usually called intersessions. In some schools they are simply vacation. In others, they are when the school offers catch-up lessons, enrichment courses or camps for students who need or want them.
Single-track and multi-track year-round schools
Year-round schools also come in two kinds, and the difference matters more than the schedule. In a single-track school, every student follows the same calendar, so the building is empty during each break. In a multi-track school, students are divided into three or four groups on staggered schedules, so one group is always on break and the building stays full. Wake County, North Carolina, runs a four-track 45/15 calendar in more than 50 elementary and middle schools, which lets a building designed for 750 children serve about 1,000, according to a 2023 review in Education Next by Paul von Hippel and Jennifer Graves.
How many schools are year-round, and in which states?
About 3 percent of U.S. schools used a year-round calendar in 2017–18, down from 6 percent in 1999–2000, and half of the year-round schools in the country returned to a traditional calendar between 2000 and 2018, according to the same Education Next review. Year-round school comes up whenever districts talk about learning loss, but it remains uncommon. Much of that decline came in California, where districts had used multi-track calendars to cope with crowding and later built enough classrooms to stop.
Year-round schools today are found in many states, including North Carolina, California, Nevada, Virginia and South Carolina, usually as a choice made by individual districts rather than a statewide rule. In Washington, 45 districts have received state grants for balanced-calendar work, according to the Education Next review.
Interest has returned in some places since the pandemic. Hopewell City Public Schools in Virginia moved every school to a single-track 45/15 calendar in the 2021–22 school year, and nearby Chesterfield County runs the same model at two elementary schools, both with help from a state grant program, according to a 2022 Hanover Research brief. One quarter of South Carolina’s districts planned to use year-round calendars in 2022–23. Philadelphia took a different route in 2024, starting a year-round pilot at 20 elementary schools that offers families free care before and after school through the year rather than requiring classes all year.
The pros of year-round school
Supporters of year-round school usually point to five benefits.
A shorter summer means less time to forget
Many students come back in the fall behind where they finished in the spring, and the loss is largest in math. An NWEA analysis of 2023 test scores found that students in kindergarten through eighth grade lost about 10 to 30 percent of a typical school year’s math learning between spring and fall, while their reading scores held nearly steady. Many teachers spend the first weeks of school reviewing what students knew in May. A five- or six-week summer leaves less time for that slide.
The breaks can carry extra help
In a single-track school, each intersession is a chance to help students who are falling behind without waiting for summer school. Bellwood Elementary in Chesterfield County uses three-week intersessions in October, January, April and July. The first week offers catch-up and enrichment lessons, the second offers enrichment camps, and the third is child care run by a partner YMCA, with about one adult for every 12 students, according to the Hanover Research brief. Hopewell offers optional one- and two-week courses designed by its own teachers.
Services and meals reach students for more of the year
For many families, school is where children eat breakfast and lunch, see a counselor or nurse, and spend the day with adults who know them. A long summer interrupts all of that at once, and summer meal programs reach only a fraction of the children who eat at school. In July 2024, 16.2 children received a summer lunch for every 100 who received a free or reduced-price school lunch during the school year, according to a 2026 report from the Food Research & Action Center. Shorter breaks keep meals and other school connections closer together, which matters most for students who depend on them.
A crowded district can avoid or delay construction
Multi-track calendars began mainly as a way to fit more students into existing buildings. Clark County, Nevada, whose enrollment doubled between 1994 and 2008, saved half a billion dollars in construction costs by using multi-track calendars, according to the Education Next review. For a fast-growing district, that can buy time while a bond is planned and new classrooms are built. edCircuit looked at the other choices crowded schools face in its guide to overcrowded classrooms.
Teachers and students get regular breaks
Supporters also point to the rhythm of the year. A break every nine weeks or so gives teachers time to recover, plan and look at student progress before the next term, rather than pushing through from January to June. Students and parents in Corinth School District in Mississippi have said the district’s balanced calendar reduces burnout and lets students get help during intersessions instead of waiting for summer school, according to the Hanover Research brief. That benefit is harder to measure than test scores.
The cons of year-round school
The drawbacks of year-round school fall mostly on budgets, families and staffing.
Does year-round school cost more?
Usually, yes. Running buildings through the summer means more air conditioning, more custodial and food service time, and buses for intersession programs. The Virginia Department of Education estimates that a year-round calendar with the same number of school days raises instructional costs by about 3 percent a year, mostly in pay for staff who teach during intersessions, according to the Hanover Research brief. Chesterfield County budgeted $123,022 a year for intersession staff and transportation at one elementary school. Districts that promise intersession help also have to keep paying for it: Indianapolis announced 20 days of required intersession for students below grade level and never funded more than 10, the Education Next review found.
Family schedules and child care get harder
Summer camps, family travel, summer jobs and child care arrangements are built around a long summer. A three-week break in October fits none of them, and families with children in different schools can end up on different calendars. In counties with many year-round schools, mothers were less likely to return to work once their children reached school age, according to research summarized in the Education Next review. Hopewell’s own survey found that 33 percent of families disagreed with the plan and 35.5 percent were neutral, even though 97 percent of teachers supported it, according to the Hanover Research brief.
Hiring and keeping experienced teachers can be harder
About half of teachers have school-age children of their own, and many rely on a traditional summer. Schools that adopted year-round calendars struggled to attract and keep experienced teachers, the Education Next review reports. Multi-track schools carry an added risk: a review summarized by Hanover found that students of color, students from low-income families and English learners were more often placed on tracks with less experienced teachers.
Sports, testing and community schedules do not move with the school
State testing windows, athletic seasons, summer programs and college courses for high school students all assume a traditional calendar. A district that changes its calendar has to work around each of them.
Is year-round school better for students?
Not on test scores alone, according to the research. The most careful studies of year-round school compare the same schools before and after they changed calendars, and they find little or no lasting gain. In California, 934 schools switched between traditional and year-round calendars 1,208 times between 1998 and 2005, and test scores fell by 1 to 2 percentile points after a switch, under both single-track and multi-track calendars. In Wake County, 22 schools that moved to multi-track calendars in 2007 saw no change in average scores, with some benefit only in the most crowded schools. A study of 30 year-round and 116 traditional schools found that year-round students learned more over the summer and less during the school year, so that learning over twelve months came out almost exactly the same. These studies are gathered in the Education Next review, whose authors also note that the meta-analyses showing slightly higher scores rest mostly on unpublished dissertations.
The Hanover Research brief reaches a similar verdict for district leaders. It calls the evidence on achievement inconclusive, notes positive results for single-track calendars in some studies and consistently negative results for multi-track calendars, and links the stronger results to how schools used the breaks for extra teaching. That is the most useful finding for a district weighing the change: the calendar gives a district more time to work with, and the results depend on how that time is used.
A middle path between year-round and traditional calendars
There is also a middle path between a traditional calendar and a full year-round one. A district could keep a shorter summer but add a three-week break in July, in the hottest part of the year, alongside a longer winter break. That keeps a predictable vacation for families and camps while shortening the longest stretch away from school. Flint, Michigan, tried a balanced calendar with four weeks of intersession instruction in 2019; three years later its superintendent backed a return to a traditional calendar with eight weeks of summer school, according to the Education Next review. Flint’s experience suggests that what districts are really trying to buy is the extra instruction, wherever it falls in the year.
Homeschool, charter and private schools
Many homeschooling families already work through the year, taking breaks when it suits the family rather than the school calendar. Charter and private schools have more freedom to change their calendars than district schools, and some use longer school years or trimester schedules. Their experience is a reminder that the calendar is a choice, but it is easier to change for one school than for a district with buses, contracts and sports schedules to coordinate.
Should schools be year-round?
For most districts, the answer depends on the problem they are trying to solve. Year-round school is not a proven way to raise achievement, but it can be a sensible choice for a crowded district or one ready to fund real instruction during the breaks.
A district considering year-round school should start with the problem it is trying to solve. If the problem is crowding, a multi-track calendar may save construction money, but it brings scheduling and staffing strains of its own. If the problem is learning loss, the evidence says the calendar alone will not fix it; the district needs a funded plan for what students will do during the breaks and a way to measure whether it works.
Leaders should also ask who will carry the cost of the change. Families need to know what child care will be available during intersessions and how siblings in different schools will be scheduled. Teachers need to know how pay, contracts and professional learning will change. Bus routes, meal programs, athletics and state testing windows all have to be worked out before the first intersession, not after. Hopewell spent a planning year surveying staff and families, and its superintendent was advised to secure support from at least 60 percent of the community before moving the whole district, according to the Hanover Research brief.
Weighed honestly, the pros and cons of year-round school come down to fit. It can work well for the right district with the right plan. It is not a shortcut to higher achievement, and families will judge it as much by how it fits their lives as by what it does for test scores.
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