In this series: Texas 2025-26 Enrollment.

Texas added nearly 1.1 million students to its public schools between 2005 and 2026, a 25.1% increase. But the five districts that once anchored that system are moving in the opposite direction. HoustonET, DallasET, AustinET, Fort WorthET, and San AntonioET ISDs are all at their lowest enrollment in 22 years of data. Not one of the five has been lower, in any prior year, than it is right now.

Together, the Big 5 enrolled 482,233 students in 2025-26. Their collective peak, 598,197 in 2014-15, is now 115,964 students in the rearview mirror, a 19.4% decline. Their share of total Texas enrollment has fallen from 13.3% in 2005 to 8.8% today. One in eight Texas students once attended a Big 5 district. Now it is fewer than one in 11.

The five trajectories

The five districts did not arrive here along the same path.

Houston ISD, the state's largest district, peaked at 215,408 students in 2016-17 and has fallen every year since. Its 2025-26 enrollment of 168,812 represents a 21.6% decline from that peak, a loss of 46,596 students. The district shed 7,227 students in the last year alone.

Dallas ISD peaked earliest, at 160,969 in 2005-06. After a partial recovery in the mid-2010s that briefly approached that level, it resumed its decline. Its current 134,308 is 16.6% below the peak. Fort Worth ISD peaked later, at 87,233 in 2016-17, and has since lost 19,742 students (22.6%).

San Antonio ISD has the steepest proportional decline: 42,548 students, down 24.8% from its 2005 level of 56,580. The district has been shrinking for the entire 22-year span of the data. Austin ISD peaked at 86,233 in 2012-13 and has shed 17,159 students (19.9%) since.

The 2026 acceleration

The combined loss in 2025-26 was 19,952 students. That is the worst single-year decline outside the COVID-19 pandemic year (2020-21, when the Big 5 collectively lost 36,096). It is nearly double the 8,791 lost the prior year.

Houston ISD lost 7,227 students, roughly matching its prior-year loss of 7,564. But the other four districts all worsened sharply. Dallas ISD lost 5,468 after gaining 680 the year before. Austin ISD lost 3,101, five times its prior-year loss of 564. Fort Worth ISD lost 2,693, nearly four times the prior year's 719. San Antonio ISD lost 1,463, more than double the prior year.

That four of five districts simultaneously accelerated is new. In prior years, one or two might worsen while others stabilized. In 2025-26, none of them stabilized.

What is pushing families out

The mechanisms differ by city, but three forces recur across all five districts: suburban migration, charter competition, and rising housing costs that price families out of urban cores. A fourth factor, the state takeover of Houston ISD, has compounded the decline in Texas' largest district.

A University of Houston report published in January 2026 found that HISD lost more than 13,000 students in the two years following the Texas Education Agency's June 2023 takeover, which replaced the elected school board with state-appointed managers. The report documented a 15.1% drop in ninth-grade enrollment in just two years and found that the share of uncertified teachers rose from under 1% to nearly 20%.

"High school had kind of stabilized" before the takeover. -- Houston Public Media, January 2026

Fort Worth ISD faces a parallel fiscal crisis. The district adopted a $1 billion budget with a $43.6 million shortfall for 2025-26 and voted to close 18 schools by 2029, expected to save $77.3 million over five years.

"This process itself was emotional, the decision was emotional, and the execution is going to be emotional." -- Kellie Spencer, Fort Worth ISD deputy superintendent of operations, CBS Texas

Austin ISD is closing 10 campuses for the 2026-27 school year and now projects a $49 million deficit, more than double the shortfall the board originally approved. The district's enrollment came in thousands below the 72,303 it had budgeted, and each missing student carries a per-pupil funding loss.

In the Fort Worth area alone, more than 49,000 students were enrolled in charter schools in 2024-25. Charter operators like Uplift Education, International Leadership of Texas, and IDEA Public Schools have expanded aggressively in every Big 5 metro. Birth rate declines compound the problem: Tarrant County's birth rate fell from 17.3 per 1,000 in 2005 to 14 per 1,000 in 2020.

The suburban mirror image

The Big 5's losses are not disappearing from the Texas system. They are moving to the ring of suburban districts that surround every major metro.

Katy ISDET, west of Houston, added 51,083 students since 2005, growing from 44,212 to 95,295 (115.5%). Frisco ISDET, north of Dallas, added 46,592 (289.0%). Cypress-Fairbanks ISDET added 35,509, Conroe ISDET added 32,500, and Northside ISDET in San Antonio added 24,320. The five largest suburban gainers collectively added 190,004 students over the same period that the Big 5 lost 99,827.

This is not a statewide enrollment problem. Texas added 1,099,433 students between 2005 and 2026. The urban core is hemorrhaging students into a growing suburban ring while continuing to maintain facilities, debt service, and transportation networks built for enrollment levels that no longer exist.

A shrinking share of a growing state

The Big 5's declining share is a structural shift in where Texas educates its children. In 2005, these five districts enrolled 13.3% of all Texas public school students. By 2015, that share had already fallen to 11.5% as the state grew faster than the urban cores. By 2026, it hit 8.8%, a one-third reduction in the Big 5's share of the system.

This matters for state-level politics, funding formulas, and infrastructure planning. Districts that once dominated legislative hearings and budget debates now represent a smaller fraction of the students whose per-pupil allotments shape state spending. The basic allotment was effectively frozen at $6,160 per student from 2019 through 2025, with the 2025 legislature adding only a $55 guaranteed yield increment to bring the effective figure to $6,215. For districts whose enrollment is falling, flat per-pupil funding on a shrinking base creates a compounding budget problem.

The ESA wildcard

The Texas Education Freedom Act, signed into law by Governor Abbott, establishes education savings accounts beginning in the 2026-27 school year, backed by $1 billion in state funding. The program will allow families to direct public funds toward private school tuition and other educational expenses.

The districts most exposed are the Big 5. Urban core districts have the highest concentrations of families with access to private school alternatives and the most charter competition. San Antonio families are already rushing to apply as the enrollment deadline approaches. San Antonio ISD, already at just 42,548 students and down a quarter from 2005, has the least margin for further losses.

No public data yet shows how many ESA applications come from current Big 5 students versus families already in private schools or homeschooling. That distinction will determine whether the program accelerates the urban core's decline or merely formalizes choices families already made. The 2026-27 enrollment numbers, the first to reflect ESA availability, will be the critical data point.

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