The four-day week, mapped
Missouri has one of the highest rates of four-day school weeks in the country. This map shows the year each district adopted the schedule — more than a decade of spread across the state, concentrated in rural Missouri and now reaching larger districts.
What this page shows
- 193 public districts are scheduled to use a four-day week in 2026–27, up from 185 in 2025–26. The new-year count is provisional until DESE confirms calendars in October; 184 of the scheduled 193 are rural, so almost everything that looks like a “four-day effect” is partly a rural effect.
- Missouri’s own DESE/SAS evaluation found no overall statistically significant effect — helpful or harmful — on academic achievement or building growth. A newer district snapshot below shows why current score differences should not be mistaken for a calendar effect.
- Statewide, four-day districts pay $4,192 less at the median. Compare them only to their rural five-day neighbors and the gap collapses to $1,024 — and starting pay is $40,000 in both.
- It was never a budget cut. Four-day districts spend no less per pupil than their rural five-day peers — slightly more, in fact.
- The switch is a local decision: each district’s own locally elected school board chooses the calendar — it is not set or required by the state.
- By law, four-day districts must meet the same minimum hours of instruction each year as five-day districts. The calendar changes when those hours happen, not how many there are — students spend just as much time with a teacher either way.
When each district made the switch
This is a timeline, not an evaluation of the schedule. It shows when districts first adopted a four-day week and distinguishes those projected to join or known to have returned to five days. The pay, enrollment and spending comparisons later on this page address outcomes separately.
Who pays less — and compared to whom?
Statewide, four-day districts pay less at every step of the master’s-degree lane, and the gap grows with experience. But most four-day districts are rural — and rural Missouri pays less everywhere. Flip the switch and watch what happens to the gap when you compare rural districts only.
View the numbers as a table
| MA-lane benchmark | 4-day (all) | 5-day (all) | 4-day (rural) | 5-day (rural) |
|---|---|---|---|---|
| Entry step | $41,007 | $43,000 | $41,000 | $41,220 |
| MA + 10 years | $45,950 | $48,100 | $45,788 | $46,125 |
| Top of MA lane | $55,950 | $61,300 | $55,725 | $56,300 |
Medians of district salary schedules from the MNEA 2025–26 salary report — 472 districts report a master’s lane (347 rural). Starting pay on the BA lane is $40,000 in nearly every district under the teacher baseline salary grant. These figures describe published schedules, not individual teachers, and imply nothing causal about the four-day calendar itself.
Four-day and five-day Missouri, side by side
The three maps below all carry the same control: a Week Length filter in the top corner. Untick a box and half the state disappears — which is the fastest way to see that four-day Missouri and rural Missouri are very nearly the same map. Each comparison below is reported two ways: statewide, and then against rural five-day districts only. The second number is the honest one.
The four-day pay gap is mostly a rural pay gap
Average teacher salary, 2025. Use the Week Length filter to show four-day districts alone, five-day alone, or both.
Four-day schools do not underpay for their geography. Rural Missouri underpays everywhere — and what remains of the four-day gap sits at the top of the schedule, not the bottom, which is where a district loses its most experienced teachers.
Shrinking faster — even among their own neighbors
Enrollment change, 2010 to 2025. Blue is growth, red is decline.
Read that in the right direction. The four-day week is a schedule districts reach for when they are losing children and cannot compete for teachers — not a schedule that drives families away. Adoption follows hardship. These data can establish that the two travel together; they cannot establish which one moved first, and we do not claim they can.
It was almost never about the money
Current per-pupil spending, 2025. Darker = higher spending.
This matches the national research, which has consistently found savings of roughly 1–2% at most — a rounding error in a school budget. When districts explain the switch, they tend to talk about recruiting teachers they otherwise could not hire. The pay map above is the reason why.
Missouri found no overall statistically significant schedule effect
This is the question the maps above cannot answer by themselves: after accounting for where districts started, did switching to four days change achievement or academic growth? Missouri DESE commissioned SAS EVAAS to test that question with Missouri student data. The study’s overall answer was no statistically significant effect — helpful or harmful.
The latest district file covers school year 2024–25. To make the fairest simple comparison available, the table below includes rural districts only and removes the three statewide virtual-school hosts. Four-day districts still post somewhat lower median levels. That does not overturn DESE’s result: a current level comparison cannot tell whether the calendar caused the gap, especially when adopting districts started lower.
Rural district academic medians, 2024–25
| District measure | Rural four-day | Rural five-day | Difference |
|---|---|---|---|
| APR points earned | 78.8% | 80.9% | −2.1 points |
| ELA performance index | 381.4 | 385.8 | −4.4 |
| Math performance index | 368.7 | 378.5 | −9.8 |
What the DESE study did not test: what students do on the fifth day, whether districts changed total instructional time, teacher retention, operating costs or every other outcome families may care about. Its conclusion is specifically about academic achievement and building growth. The site’s current table was reproduced from the canonical 516-district master and academic files; full cohort and exclusion details are in Methods.
What the comparisons — and Missouri’s own study — actually say
Missouri’s four-day week correlates with almost everything you would expect a struggling rural district to correlate with — lower pay, shrinking enrollment and lower test-score levels. The maps above try to hold “rural” constant and see what is actually left. Pay and spending gaps mostly close; enrollment decline does not. On academics, the official Missouri evaluation goes further and finds no overall statistically significant change attributable to the schedule.
If your district is considering — or already runs — a four-day week, the pay numbers look alarming at first glance: four-day districts pay teachers $4,192 less at the median. But compare only to other rural districts, which is nearly all of them, and the gap falls to $1,024 — about 2.2%. Starting pay is identical, $40,000 either way.
What the calendar has not touched is the classroom budget: four-day districts spend about $103 more per pupil than their rural five-day neighbors, not less. Whatever tradeoffs a four-day week carries for your family’s schedule, an underfunded classroom does not appear to be one of them.
On academics, Missouri’s official study found no overall statistically significant effect on achievement or building growth. That is not a promise that every child or district responds the same way; it is the best statewide Missouri evidence available about the schedule’s average academic effect.
One worry does not hold up under Missouri law: since the four-day week became an option here, districts have always been required to meet the same minimum hours of instruction each year as five-day schools. A four-day calendar means longer school days, not less time with a teacher — by law, the total hours in front of a teacher are the same either way.
The salary-ladder tool above is built to answer the question a board actually asks: are we losing this fight to five-day districts, or to geography? At the top of the master’s lane, the statewide gap is $5,525 — but toggle to rural-only and it drops to $450, under 1%. If you are a rural four-day district, you are probably not losing teachers to the calendar.
The enrollment picture is the one exception worth sitting with: even against other rural districts, four-day schools lost 15.9% of enrollment at the median against 12.6% for rural five-day schools. That gap does not shrink when you control for rural — it is the one comparison on this page that gets worse, not better.
The academic section adds an important discipline to local conversations: do not treat a lower current score as proof that the calendar caused it. Ask whether achievement or growth changed after adoption, compared with similar districts over the same years — the question DESE’s evaluation was designed to test.
The clean, policy-relevant fact here is one this page is careful about: 100% of four-day-week ballot measures have passed, and adoption has spread from a handful of rural districts in the 2010s to 193 districts today — 37% of the state, one of the highest rates of any state in the country. This is not a schedule imposed on communities; it is one each district’s own locally elected school board chooses, repeatedly and by a wide margin, when offered it.
But causation runs in an uncomfortable direction worth legislating around carefully: districts tend to adopt the four-day week when they are already losing enrollment and cannot compete for teachers. The calendar looks very likely to be a response to rural decline, not a cause of it — and a policy built on the assumption that ending four-day weeks would reverse enrollment loss is likely solving the wrong problem.
The same caution applies to test scores. DESE’s Missouri-specific evaluation found no overall statistically significant helpful or harmful effect on achievement or building growth. Policy claims that the calendar clearly raises or lowers scores should meet that evidence directly.
The most common assumption about the four-day week — that it is a cost-cutting move — does not hold up here. Four-day districts spend slightly more per pupil than their rural five-day peers, and national research consistently finds savings of only 1–2%, a rounding error in a school budget. When districts explain the switch, they tend to talk about recruiting teachers they otherwise could not hire.
If you are deciding how to feel about your district’s four-day week, the honest comparison is not four-day-versus-five-day statewide — it is your district against its actual rural neighbors. On pay and spending, that comparison mostly closes the gap. On enrollment, it does not.
On academics, the fairest statewide evidence is not a raw score comparison at all. Missouri’s official evaluation compared changes before and after adoption and found no overall statistically significant effect on achievement or building growth.
- Does our district’s pay gap versus five-day districts hold up against our actual rural neighbors, or only against the state as a whole? The toggle above answers this directly.
- Are we spending less per pupil since adopting the four-day week — or, like the statewide pattern, about the same or slightly more?
- When we discuss test scores, are we comparing current levels or changes after adoption? Missouri’s official study found no overall statistically significant schedule effect after comparing changes over time.
- Was our four-day adoption a response to enrollment decline we were already seeing, or did decline follow it? This page cannot answer that for any single district, and neither can we.
- If our board considered a public vote on the calendar, are we aware that 100% of Missouri districts that have tried have won approval? That is worth knowing before assuming a vote is risky.
- Are we losing enrollment faster than our five-day rural neighbors, even a few years in? That is the one comparison on this page where the four-day/five-day gap does not shrink under a rural-only lens — it is worth an honest look, not a defensive one.