Teacher Shortage Crisis: What It Actually Means for Your Kid

The math teacher who was there on the first day of school is gone by October. A substitute fills in. Then another. By spring, students have had four different people standing at the front of the room calling themselves the math teacher. It’s not a story from an underfunded rural district or a struggling urban school. It’s happening in affluent suburbs, mid-sized cities, and states that have been raising teacher salaries.

The US teacher shortage is both real and misunderstood. It’s not a uniform shortage of everyone who holds a teaching license. It’s a concentrated shortage in specific subjects, specific regions, and specific school types — and the students in those classrooms are experiencing measurable harm to their academic development.

Key Takeaways

• Teacher vacancies have increased steadily since 2014 and accelerated sharply after COVID-19; over 40 states reported teacher shortages in 2022–23.
• The shortage is most severe in math, science, special education, and bilingual education — subjects where preparation requirements are highest.
• Research on substitute teachers consistently shows they produce significantly lower learning gains than permanent credentialed teachers, even when instructional materials are identical.
• Students in high-poverty districts experience more turnover — and research shows teacher turnover itself is academically harmful, separate from who fills vacancies.
• Districts are responding with housing subsidies, salary increases, and “grow-your-own” pipelines; effectiveness varies significantly.

The Scope of the Shortage

The Learning Policy Institute, which tracks teacher labor markets systematically, reported that from 2008 to 2018, teacher preparation program enrollment fell by 35% nationally. By 2022, 44 states reported teacher shortages severe enough to file shortage designations with the federal government.

The shortage is not evenly distributed. The hardest-hit subjects nationally:

• Special education: Vacancy rates 2–3x higher than general education
• Mathematics (secondary): High vacancies in nearly every state
• Sciences (particularly chemistry and physics): Deep vacancies in rural and high-poverty districts
• Bilingual/ESL education: Severe shortage as English learner enrollment grows
• Career and Technical Education: Growing shortage as CTE expands

Geography matters as much as subject. Rural schools, high-poverty urban schools, and schools serving majority students of color have consistently higher vacancy rates than affluent suburban schools. This pattern has been documented by RAND, the Learning Policy Institute, and state-level analyses. The shortage doesn’t fall randomly — it concentrates where it does the most damage.

What Research Shows About Teacher Quality and Student Outcomes

The reason the teacher shortage matters academically is that teacher quality is the single most important in-school factor in student outcomes. This is one of the most consistent findings in education research.

The famous “value-added” research by economists Sanders and Rivers, published in 1996, quantified what many teachers knew intuitively: a high-quality teacher produces significantly more academic growth than a low-quality teacher — often the equivalent of one additional year of learning over the same time period. This finding has been replicated extensively, including by Chetty, Friedman, and Rockoff in a 2014 paper in American Economic Review that tracked students through adulthood and found lasting effects on earnings from teacher quality in elementary school.

The implication: when a classroom is taught by a long-term substitute, an emergency-credentialed teacher without content preparation, or a series of rotating substitutes, students are not receiving the instruction they need. They may receive instruction. But instruction quality varies enormously.

What Substitutes and Emergency-Credential Teachers Produce

Research specifically on substitute teacher effects is sobering. A 2019 analysis by Xu, Hannaway, and D’Souza in Journal of Policy Analysis and Management tracked student achievement in North Carolina before and after teacher absences. Each day with a substitute teacher was associated with a measurable decline in student learning. Extended absences — meaning vacancies filled by long-term substitutes — produced larger deficits.

Emergency credential programs, which allow individuals without traditional teaching preparation to teach while completing requirements, show mixed results. Research shows emergency credentialed teachers improve significantly over their first three years — but their early teaching, during the preparation deficit, is measurably less effective than that of prepared teachers.

Coverage Type	Relative Learning Effect	Research Base	Notes
Fully credentialed teacher (5+ years)	Baseline	Strong	Largest effect size
Fully credentialed teacher (1–3 years)	Slightly below baseline	Strong	Improves rapidly
Emergency-credentialed teacher	0.10–0.15 SD below	Moderate	Improves over years
Long-term substitute (certified)	0.20–0.30 SD below	Moderate	Depends on prep
Rotating daily substitutes	0.30–0.50 SD below	Moderate	Worst for continuity
Vacancy (class split/coverage)	Unknown, likely severe	Limited	Rarely studied directly

The Compounding Effect: Turnover Harms More Than Who Fills the Vacancy

One of the less-discussed aspects of the teacher shortage: teacher turnover itself is academically harmful, separate from the quality of whoever fills the vacancy.

A 2017 study by Ronfeldt, Loeb, and Wyckoff in American Educational Research Journal found that students in schools with high teacher turnover showed lower achievement, even in classrooms taught by teachers who stayed. The mechanism: high turnover disrupts school culture, depletes institutional knowledge, reduces coherent curriculum implementation, and depresses teacher morale. The harm isn’t just felt in classrooms without teachers — it radiates through the whole school.

Research by Hanushek and Rivkin has documented that high-poverty schools have substantially higher turnover rates than affluent schools, creating a compounding disadvantage: these schools recruit harder-to-fill positions and then lose those hires at higher rates.

What Districts Are Doing: Salary, Housing, and Grow-Your-Own Programs

Districts are not passive in the face of the shortage. Three major strategies have emerged, with varying evidence of effectiveness.

Teacher salary increases. Economists have documented a teacher pay gap — teachers earn less than comparably educated workers in other fields, with the gap widening since 2000. Several states (Arizona, Oklahoma, West Virginia) implemented substantial salary increases after teacher strikes in 2018. Research by Nagler, Piopiunik, and West (2020) found that higher salaries attract higher-aptitude individuals into teaching. The effect is real but not immediate — pipeline changes take years to show up in classrooms.

Teacher housing programs. Districts in high-cost cities (San Francisco, Los Angeles, Seattle) have built or subsidized teacher housing to address the cost-of-living barrier. Research on teacher housing programs is limited, but recruitment and retention data from early programs is positive. San Francisco Unified’s teacher housing program is among the most studied.

Grow-your-own programs. These programs recruit high school students — often from communities underserved by teacher shortages — into education pathways and support them through credentialing. Illinois, Nevada, and Texas have statewide grow-your-own initiatives. Early outcome data shows strong retention: teachers from grow-your-own programs stay longer in hard-to-staff schools than traditionally recruited teachers.

What Parents Should Watch For in Their School

Signs that your child’s school is experiencing shortage-related harm:

Persistent substitutes in core academic classes. One or two days of substitute coverage is normal. Weeks of rotating substitutes in math or reading/English suggests a vacancy.

Class size increases. Districts managing shortages sometimes consolidate classes rather than hire substitutes, increasing class size. If class rosters are significantly larger than last year, ask why.

Courses being dropped. AP courses, electives, foreign languages, and special programs are vulnerable when specialist teachers can’t be hired. If a course your child expected to take isn’t being offered, ask the reason.

Teacher turnover rates on school report cards. Most states publish teacher turnover rates on school report cards or state data systems. A rate above 20% per year is concerning. Above 30% is severe.

For parents thinking about how all this connects to their child’s learning trajectory, understanding the science of how retrieval practice works matters more when classroom instruction is inconsistent — students need strategies that work even when teaching quality varies. And the homework research becomes relevant when students are getting less effective in-class instruction and relying more heavily on home practice.

What to Watch For Over the Next 3 Months

Month 1: Find out how many teachers in your child’s school are on emergency credentials or long-term substitute assignments. Most districts are required to disclose this information, though you may need to ask specifically.

Month 2: Ask your child who is teaching each of their core classes. If the answer is “a sub” or “a different person every week,” that’s the shortage in action. Contact the school counselor to understand the plan for the rest of the year and what academic support is available.

Month 3: At the next school board meeting or survey opportunity, express concern about vacancies and ask what the district’s plan is. Districts respond to parent visibility. They can’t always fix shortage conditions quickly, but documenting community concern moves it higher on the priority list.

Frequently Asked Questions

My child’s school always seems fully staffed. Am I in a different situation?

Probably. The shortage is highly concentrated. Affluent suburban districts attract and retain teachers more easily because of higher salaries, better working conditions, and lower stress environments. If you’re not experiencing shortage impacts, your neighbors in less-affluent districts likely are. The policy question is whether that’s acceptable.

Should I hire a private tutor to compensate for classroom instruction gaps?

If your child is in a class with persistent substitute coverage or high teacher turnover, targeted tutoring in affected subjects can compensate. Research on high-dosage tutoring (see high-dosage tutoring article) shows strong learning effects. The equity concern: families who can afford tutors compensate while those who can’t fall further behind.

Are online teachers a solution for hard-to-fill vacancies?

Partially. Some districts use synchronous online teachers for specialized subjects (calculus, AP Physics, Mandarin) that would otherwise go unfilled. Research on online vs. in-person instruction quality is mixed, but having a qualified online teacher is better than rotating substitutes. Implementation quality matters greatly.

Why don’t schools just pay teachers more to solve this?

Salary is one factor but not the only one. Working conditions, administrative burden, student behavior challenges, lack of preparation time, and the emotional weight of high-need environments all contribute to attrition, especially in high-poverty schools. Salary increases help recruit more people into the pipeline, but retention requires addressing working conditions. Districts that have addressed both are seeing the best results.

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About the author Ricky Flores is the founder of HiWave Makers and an electrical engineer with 15+ years of experience building consumer technology at Apple, Samsung, and Texas Instruments. He writes about how kids learn to build, think, and create in a tech-saturated world. Read more at hiwavemakers.com.

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Sources

1. Carver-Thomas, D., & Darling-Hammond, L. (2019). “Teacher Turnover: Why It Matters and What We Can Do About It.” Learning Policy Institute. https://learningpolicyinstitute.org/product/teacher-turnover-report
2. Chetty, R., Friedman, J. N., & Rockoff, J. E. (2014). “Measuring the Impacts of Teachers II: Teacher Value-Added and Student Outcomes in Adulthood.” American Economic Review, 104(9), 2633–2679. https://doi.org/10.1257/aer.104.9.2633
3. Xu, Z., Hannaway, J., & D’Souza, S. (2009). “Student Transience in North Carolina: The Effect of Student Mobility on Student Outcomes Using Longitudinal Data.” CALDER Working Paper No. 22.
4. Ronfeldt, M., Loeb, S., & Wyckoff, J. (2013). “How Teacher Turnover Harms Student Achievement.” American Educational Research Journal, 50(1). https://doi.org/10.3102/0002831212463813
5. Nagler, M., Piopiunik, M., & West, M. R. (2020). “Weak Markets, Strong Teachers: Recession at Career Start and Teacher Effectiveness.” Review of Economics and Statistics, 102(3). https://doi.org/10.1162/rest_a_00820
6. Learning Policy Institute. (2022). “The Teacher Shortage in America: How We Got Here and Steps to Reverse It.” https://learningpolicyinstitute.org/product/teacher-shortage-interactive