The Hollow Core: Missouri’s Vanishing Mid-Career Teachers
Missouri’s teacher workforce is not shifting evenly.
This second report in Aligned’s Missouri Teacher Workforce Series examines where the loss of mid-career teachers is most pronounced and what those patterns mean for schools, students, and long-term workforce stability.
Overview
Missouri is losing mid-career teachers across grade levels and subject areas, but the decline is not happening uniformly. This report finds that the “missing middle” is especially pronounced in transition grades, core academic subjects, and early elementary classrooms where experienced educators often help anchor instructional continuity and support less experienced colleagues.
The report also shows that some subject areas are being hollowed out by the loss of mid-career teachers, while others are increasingly reliant on late-career educators nearing retirement. Together, these patterns point to a more fragile teacher labor market and raise important questions about how Missouri supports long-term retention and instructional stability.
Key Findings
- The loss of mid-career teachers is most severe in transition grades. Grade 6 saw a 9.7 percentage point drop in teachers with 7 to 15 years of experience between 2015 and 2024, with Grades 4, 5, and 3 also seeing steep declines.
- Missouri’s subject-area trends reveal two different challenges. Social Studies and English Language Arts are losing mid-career teachers fastest, while Math and Science are becoming increasingly dependent on veteran teachers nearing retirement.
- Early grades appear stable on the surface, but expertise is thinning underneath. Kindergarten and Grade 3 have both seen notable declines in mid-career teachers, weakening the internal support structures that help schools implement literacy reforms well.
Why It Matters
Mid-career teachers often serve as the instructional anchors of a school. They mentor newer educators, stabilize grade-level and subject-area teams, and help schools translate policy into classroom practice. As those teachers disappear, the effects ripple outward.
This report suggests Missouri is facing several overlapping workforce challenges at once: retention pressure in transition grades and core subjects, a coaching gap in early literacy, and a growing retirement risk in areas already under strain. Without a stronger focus on retaining and developing teachers over time, those pressures may become harder to manage.
Missouri Teacher Workforce Series
This report is part of a three-part series examining Missouri’s educator workforce:
- Part 1: Rising Novices, Growing Veterans, and Shrinking Middle
- Part 2: The Hollow Core: Missouri’s Vanishing Mid-Career Teachers (You are here)
- Part 3: The Fragility of the Missouri Teaching Workforce (Coming soon)