TL;DR
A substitute teacher shortage happens when schools cannot reliably fill teacher absences with qualified substitutes. The problem is not always a lack of people on the roster. Often, districts have hundreds of cleared substitutes but a small active pool willing to accept assignments at specific schools, times, and roles. The result is combined classes, lost planning periods, administrators covering classrooms, and support staff pulled away from their actual jobs. Solving it takes more than raising pay: schools need better assignment experiences, targeted incentives for hard-to-fill sites, and coverage plans that extend beyond the classroom.
What Is a Substitute Teacher Shortage?
A substitute teacher shortage occurs when a school or district cannot reliably fill teacher absences with qualified, available substitutes at the time, location, and role needed.
This is a bigger system than most people realize. Close to 600,000 substitute teachers cover more than 30 million K-12 absences each year in the United States, according to a Bureau of Labor Statistics summary of research on the substitute labor market. When that system breaks down, it breaks down fast.
The shortage can affect same-day sick calls, planned professional development days, long-term leaves, and vacant teaching positions that districts cannot permanently fill. But the term itself is slightly misleading. A substitute teacher shortage is rarely about having zero substitutes. It is about having too few substitutes who are willing, qualified, cleared, and able to accept the specific assignments that need filling on any given morning.
One useful way to think about it: the substitute teacher shortage is a coverage failure, not just a headcount problem.
Why Substitute Teacher Shortages Matter
Teacher absences are normal. Illness, family emergencies, professional development, jury duty, parental leave. Every school plans for them. The system only works when someone qualified shows up to cover.
When nobody does, schools improvise. And that improvisation carries real costs.
RAND Corporation research found that during 2021-22, 90% of districts changed operations in one or more schools because of staffing shortages. Districts reported combining classes, asking teachers to cover during their planning periods, reassigning central office staff to classrooms, and enlisting parents or volunteers.
These workarounds have consequences. Teachers who lose planning time burn out faster. Paraprofessionals pulled into classrooms cannot support the students they were assigned to help. Principals stuck covering third period are not observing instruction or leading their buildings. Students get supervision instead of teaching.
The Education Commission of the States notes that the average U.S. student will spend a full year of their K-12 education with substitute teachers. That makes substitute quality and availability an instructional issue, not just a logistics problem. When coverage gaps affect school outcomes, every role in the building feels it.
How a Substitute Teacher Shortage Shows Up in a School
The effects of a substitute shortage rarely stay contained in one classroom. They ripple across the building.
A substitute teacher shortage may look like:
Open jobs sitting unfilled in the absence management system
Principals or assistant principals covering classrooms instead of leading
Teachers giving up prep periods to cover a colleague’s class
Classes being split and students redistributed across other rooms
Paraprofessionals or aides pulled away from student support
Front office staff scrambling to locate last-minute coverage
Long-term leaves covered by a rotating cast of adults with no continuity
Professional development sessions canceled or rescheduled
Students receiving supervision rather than instruction
Substitutes avoiding specific schools or assignment types entirely
The teamwork between main staff and support staff breaks down when everyone is patching coverage holes instead of doing their actual work. A school counselor monitoring a cafeteria is not counseling students. An instructional coach babysitting a combined class is not coaching teachers.
What Causes a Substitute Teacher Shortage?
The causes fall into three categories: too much demand, too little supply, and poor matching between the two.
Demand-Side Causes
Teacher absences are increasing, and the reasons go beyond sick days. Professional development requirements, mental health leave, and family obligations all contribute. More importantly, broader teacher shortages are pulling would-be substitutes into permanent positions. When a district cannot hire a certified special education teacher, a long-term substitute fills that role for months, removing them from the daily coverage pool.
The Learning Policy Institute estimates that at least 411,549 teaching positions were either unfilled or filled by teachers not fully certified for their assignments in 2024-25, roughly 1 in 8 teaching positions nationally. Every one of those positions increases reliance on substitute coverage.
Supply-Side Causes
Pay is the most-cited barrier, and the data backs it up. RAND found that 85% of district respondents reported a higher local substitute wage than their own district paid. Average daily pay was $122 in spring 2022, only about 6% above prepandemic levels after adjusting for inflation. For comparison, a substitute earning $122 for a full school day is making roughly $15 an hour, which competes directly with retail, food service, and warehouse work that often offers more predictable schedules and benefits.
Beyond pay, substitutes face no health insurance, unpredictable income, burdensome application processes, and minimal training. The Education Commission of the States reports that only 56% of substitute teachers receive any training before starting, and just 6% receive ongoing professional development. Practitioners on Reddit regularly cite low pay, no benefits, students taking advantage of substitutes, and a lack of due process when complaints arise as reasons people leave substitute work.
Those looking for flexible work in education often weigh substitute teaching against gig platforms that offer faster onboarding and daily pay. The competition for hourly workers is real.
Matching and Retention Causes
This is where the shortage gets interesting, and where most articles miss the point.
Frontline Education reported that in 2017-18, 49% of substitutes in their system did not work at all. Those who did work accepted an average of 33 days. That means a district can have a large roster and still face a severe substitute teacher shortage because the active pool is half the size of the list.
Why don’t cleared substitutes accept jobs? Some avoid long commutes. Some avoid schools where they felt unsupported or unsafe. Some only want certain grade levels or subjects. Some got full-time work elsewhere and never removed themselves from the system. Research from the NBER study of Chicago Public Schools found that substitutes preferred shorter commutes and safe working environments over a possible 27% wage premium. Pay matters, but it is not the only factor.
Assignment platforms also play a role. Practitioners on Reddit describe jobs disappearing within seconds on Frontline and similar apps, with preferred-substitute lists routing jobs before they appear to the broader pool. Schools may contact their favorites directly, meaning some substitutes see plenty of work while others in the same district see nothing.
Is the Substitute Teacher Shortage National or Local?
Both. But the experience is always local.
Nationally, the BLS summary of NBER research indicates that 20% of substitute requests went unfilled. That is a systemwide signal of undersupply. But averages conceal sharp local differences. In one Reddit thread, a substitute reported more than 50 open assignments in their district, while commenters from other areas described no available jobs and intense competition for every posting.
Even within a single district, the shortage can vary wildly from school to school. The Chicago study found that schools in the bottom quintile averaged 50% substitute fill rates, while top-quintile schools were above 95%. Same city, same pay rate, same pool of substitutes. The difference was school conditions, location, and substitute preferences.
This means saying “there is a substitute teacher shortage” or “there is no substitute teacher shortage” are both oversimplifications. The accurate statement is: many schools face chronic coverage shortfalls, while some schools in the same system fill nearly every absence.
Substitute Teacher Shortage vs. Teacher Shortage
These terms overlap but mean different things. Confusing them leads to mismatched solutions.
Concept | What It Means | Example |
|---|---|---|
Teacher shortage | Schools cannot hire enough fully certified teachers for permanent roles | A district cannot find a certified special education teacher for an open position |
Substitute teacher shortage | Schools cannot fill temporary absences with available qualified substitutes | A teacher calls out sick and no substitute accepts the job |
Long-term substitute shortage | Schools cannot find someone to cover multi-week leaves or vacancy assignments | A maternity leave is covered by a different adult each week |
Support staff shortage | Non-teaching roles are vacant or uncovered | A classroom aide position sits empty for months, or a cafeteria worker calls out with no backup |
The broader teacher shortage feeds directly into substitute demand. When permanent positions go unfilled, districts rely on long-term substitutes, which shrinks the pool available for daily coverage. NCES data for 2024-25 shows public schools reported an average of six teaching vacancies and filled 79% before school started. The unfilled 21% often becomes a long-term substitute assignment.
Support staff shortages compound the problem further. NCES reported that schools also had an average of five non-teaching vacancies, with lower fill rates for transportation (60%), tutors, classroom aides (74%), and custodial staff. When support staff are absent and uncovered, it is often teachers or administrators who absorb the extra work. For schools trying to build a permanent hiring pipeline for these roles, the connection between substitute coverage and longer-term vacancies is hard to ignore.
How Schools Measure Substitute Shortages
Most schools know they have a problem. Fewer can say precisely how big it is. These metrics help.
Fill rate. The percentage of teacher absences filled by a substitute. This is the single most important number. If a district has a 75% fill rate, one in four absences goes uncovered.
Active substitute rate. The share of cleared substitutes who actually accept jobs in a given period. Frontline’s data showing 49% inactivity makes this metric essential, because roster size does not equal supply.
School-level fill rate. Shows inequities between buildings. A district with an 80% overall fill rate might have individual schools at 50% and others at 98%.
Role-level fill rate. Reveals which assignments are hardest to cover. Special education, elementary, half-day, and long-term assignments often have lower fill rates than general secondary coverage.
Days worked per substitute. Helps identify whether the pool is engaged or dormant.
Staff-pull rate. How often teachers, paraprofessionals, administrators, or office staff are pulled from their regular duties to cover. This is the metric that connects substitute shortages to whole-school disruption.
Time-to-fill. How long it takes from absence request to accepted assignment. For same-day absences, speed is everything.
Diagnosing Your Substitute Teacher Shortage
Not all shortages have the same root cause. Before jumping to solutions, it helps to identify the pattern.
Symptom | Likely Cause | Where to Start |
|---|---|---|
Many cleared subs, low fill rate | Inactive roster, poor engagement | Re-engage inactive substitutes; improve the assignment experience |
Jobs fill at some schools but not others | School-level preferences, commute, culture | Targeted incentives and school-site support |
Fridays and Mondays go uncovered | Predictable absence patterns | Targeted daily pay differentials; reschedule PD away from high-absence days |
Special education assignments go uncovered | Higher skill demand, uncertainty | Role-specific training and pay differentials |
Substitutes accept then cancel | Low commitment, better offers, poor job info | Clearer job descriptions, competitive pay, preferred pools |
Teachers lose planning periods regularly | Inadequate backup coverage | Building substitutes, staffing partners, support staff pool |
Office, cafeteria, or custodial staff get pulled to classrooms | Whole-school staffing shortage | Build a coverage pool beyond teachers; consider on-demand school coverage for support roles |
What Schools Can Do About a Substitute Teacher Shortage
Compete on Pay Where It Matters
RAND found that 60% of districts increased pay or benefits for substitute teachers in 2021-22. NCTQ’s analysis of 150 large districts found that 89 gave substitutes some kind of pay raise during the pandemic, with average starting pay rising from $13 to $15.50 per hour. These increases helped but were often modest. Pay is necessary. It is not sufficient.
Use Targeted Incentives for Hard-to-Fill Schools
Blanket pay increases spread dollars evenly across schools that may not need help. Targeted incentives concentrate resources where fill rates are lowest. FutureEd reports that Chicago Public Schools tested $30-$40 stipends on top of a $165 daily rate in hard-to-staff schools, producing a nearly 50% increase in filled substitute requests at those sites. This is some of the strongest evidence available that precision beats generality.
Improve the Day-One Experience
Substitutes who have a bad first day at a school rarely come back. The fixes are inexpensive. Edustaff’s survey of substitutes found they want basics: lunch schedules, office phone numbers, technology passcodes, bathroom locations, hallway rules, discipline procedures, emergency plans, and actual lesson plans. Assigning a staff member to welcome substitutes and answer questions costs nothing and changes the experience entirely.
For a sense of what school front desk coverage looks like from the substitute’s perspective, small gestures of welcome and clarity make a measurable difference in whether someone returns.
Train Substitutes Before They Enter Classrooms
Sending untrained adults into classrooms and hoping for the best is not a staffing strategy. Yet 44% of substitutes receive zero training before their first assignment, and only 6% get ongoing professional development. Classroom management, emergency procedures, special education basics, and school culture orientation are minimum expectations for any role where an adult is responsible for children.
Build an Active Pool, Not Just a Big Roster
If half the substitutes on your list never accept a job, the list is not your pool. Districts that track active substitute rates, run re-engagement campaigns, and create clear pathways from occasional work to regular assignments will get more from the people already in their system than from another recruitment push.
A worker-centered approach to K-12 staffing that offers weekly pay, schedule flexibility, and career development tends to keep people in the active pool longer than a system that treats substitutes as interchangeable and disposable.
Create Building Substitute Roles
A building substitute is assigned to one school daily and covers wherever needed. They know the students, the staff, the routines. This model costs more per day than a general sub pool, but it dramatically reduces the number of uncovered absences and the instructional disruption that comes with a stranger walking into a classroom cold.
Schedule Professional Development Strategically
Many districts create their own substitute demand by scheduling teacher training on Mondays, Fridays, or during flu season. Studying absence data and moving PD to lower-absence periods reduces the peak load on the substitute system.
Avoid Relying Only on Lowered Requirements
Broadening eligibility is the fastest way to expand the substitute pool on paper. But NCTQ found that only 18 of 150 large districts actually lowered education requirements during the pandemic. Lowering the bar does not automatically produce more willing, capable substitutes or fix school-level inequities.
Plan for Support Staff Coverage Too
Most conversations about substitute shortages focus on classroom teachers. But when no substitute arrives, the disruption flows into non-teaching roles. NCES reported that 69% of public schools had difficulty filling non-teaching vacancies before 2024-25, with particularly low fill rates for transportation, tutoring, and classroom aide positions.
Coverage gaps do not only happen in classrooms. When a paraprofessional is absent, when the front office is short-staffed, when an after-school program lacks an adult, schools need a plan for those roles too. If your coverage challenges extend into office, paraprofessional, cafeteria, custodial, after-school, or operations roles, BrightBee’s on-demand coverage model is built specifically for K-12 support staffing. For longer-term needs, BrightBee also offers a hosted workforce option that handles payroll and compliance for temporary and semi-permanent hourly staff.
Frequently Asked Questions
What is a substitute teacher shortage?
A substitute teacher shortage is when a school or district cannot reliably fill teacher absences with qualified substitutes. It can involve daily sick calls, professional development days, long-term leaves, or vacant teaching positions that require temporary coverage.
Why is there a shortage of substitute teachers?
Common reasons include low pay relative to other hourly work, no benefits, unpredictable schedules, weak training, poor assignment information, difficult working conditions at certain schools, and competition from other flexible jobs. Teacher vacancies also pull potential substitutes into permanent roles, shrinking the daily coverage pool.
Is the substitute teacher shortage the same as the teacher shortage?
No. A teacher shortage refers to unfilled permanent teaching positions or roles filled by teachers not fully certified for their assignments. A substitute teacher shortage refers to the inability to cover temporary absences. The two overlap because permanent vacancies increase demand for long-term substitutes, reducing availability for daily coverage.
How do schools handle classes when no substitute is available?
Schools typically combine classes, ask teachers to cover during planning periods, assign administrators to classrooms, pull paraprofessionals or support staff, or move students to larger supervised spaces. RAND documented these operational responses during 2021-22, with 90% of districts reporting at least one such change.
Do higher wages solve substitute teacher shortages?
Higher wages help, especially when a district pays less than neighboring districts or local hourly employers. But the Chicago research shows that commute distance, safety, school conditions, and targeted incentives also influence whether substitutes accept jobs. A 27% wage premium was less attractive to substitutes than a shorter commute and a safe working environment.
Why do some districts report a shortage while substitutes say they cannot find work?
Both can be true simultaneously. A district may have hard-to-fill schools, roles, or days while other assignments are highly competitive. Preferred-substitute lists can route jobs to favorites before they appear in general assignment apps. Practitioners on Reddit frequently describe this paradox, where dozens of jobs sit open in one district while substitutes in another area compete fiercely for every posting.
How is a substitute shortage measured?
The most useful metrics include fill rate (share of absences covered), active substitute rate (share of cleared subs who actually work), school-level fill rate (coverage by building), role-level fill rate (coverage by assignment type), and staff-pull rate (how often non-substitute staff cover absences).
What can districts do besides raising pay?
Improve substitute onboarding and training. Provide usable lesson plans and school-site information. Create building-substitute roles. Use targeted incentives for low-fill-rate schools. Analyze coverage data by school and role. Schedule professional development on low-absence days. And build coverage plans for support staff, not just teachers. For schools exploring flexible staffing solutions, contact BrightBee to discuss K-12 support coverage options.
