Some U.S. schools are facing an immediate funding threat due to the government shutdown, while others are nervously eyeing their cash reserves and wondering how long the closure will last.

Schools at military facilities or on Tribal land can receive a significant portion of their budget from Impact Aid, which was immediately cut off when the federal government shut down. Some have at least temporary funds to hold them over, but others say they won't be able to stay open for long.

Katie Law, principal at Arapaho Charter High School on a Native American reservation in Wyoming, said Impact Aid makes up between a quarter and a third of her school’s budget. And much of the rainy day fund the school had saved up before this shutdown was spent on a new track and field facility last year.

“It's

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