Nearly 1.3 million students have disappeared from American colleges during the Covid-19 pandemic, raising alarms that the enrollment emergency projected to arrive a few years from now is already here.

High-school seniors uninterested in studying online chose to defer. Working parents strained by the demands of full-time pandemic child care put their studies on hold. International students couldn’t get visas. Those in majors with hands-on practicums or lab work found they couldn’t register for courses required for their degrees.

Enrollment numbers continue to look bleak as the pandemic drags on, even though in-person classes have become the norm and consulates have reopened. College attendance among undergraduates has fallen almost 10 percent since Covid emerged in early 2020; this spring, enrollment dropped 4.7 percent from the year before, according to the National Student Clearinghouse Research Center, a deeper-than-expected decline.

The persistence of the enrollment contraction has sparked fears that many students are not simply missing but gone for good. Research shows that if students stop out, or take a leave of absence, they may not continue with their studies, and that’s particularly true for those from disadvantaged backgrounds. “We have to act now,” said Courtney Brown, vice president for impact and planning at the Lumina Foundation. “This is a crisis moment.”

The pandemic enrollment slide has heightened worries at colleges about finances, especially among those dependent on tuition revenue to meet their bottom lines. Even before the Covid outbreak, the financial resiliency of a third of American colleges was poor, according to a new report from Bain & Company.