Survival Rate by Enrollment Size
The relationship between enrollment size and survival is clear. Institutions with fewer than 500 students have only an 81% survival rate. Above 1,500 students, survival is nearly guaranteed (>99.5%). Size isn't the whole story, but it's the first filter.
The threshold effect is sharp. Below 500 students, 193 of 1,016 institutions closed, a 19% closure rate. Between 500 and 900, the rate drops to 4.7%. Above 3,000, it's effectively zero. This isn't just correlation: small institutions have less financial buffer, less program diversity, and less ability to absorb enrollment shocks.
How Long Until It's Too Late?
A single year of enrollment decline is normal fluctuation. No institution in the dataset closed after just one year of decline. But sustained decline is a different story. After 3 or more consecutive years, the survival rate drops sharply. After 5 or more years, it's 75%.
The Danger Zone
The critical threshold is sharp and easy to monitor. 898 institutions in the dataset meet both criteria: enrollment under 900 and 3 or more consecutive years of decline. Of those, 184 have already closed, a 20.5% closure rate. This two-variable rule is simple enough for a board of trustees to monitor and clear enough to trigger action. If an institution crosses both thresholds, waiting it out doesn't work at that point.
The power of this threshold is its simplicity. You don't need a machine learning model or a consultant to check two numbers: (1) is enrollment below 900? and (2) has enrollment declined for 3 or more consecutive years? If both answers are yes, the institution is in the danger zone. Two numbers. That's all an early warning system needs.
There's a useful flip side: institutions that stabilize enrollment, even at a low level, have much better outcomes than those in continuous decline. The intervention point is not when the institution is small, but when the decline becomes sustained.
Kaplan-Meier survival analysis on College Scorecard and IPEDS 2015–2023 data. Decline years = consecutive annual enrollment decreases. Survival = institution still operating as of last IPEDS filing.