School districts face a back-to-school math problem: The high price of diesel

As the new school year kicks off, school districts are facing a challenging math problem: the high cost of diesel.

The price of a gallon of diesel is up nearly $2 compared with this time last year. That is meaningful for schools, considering that around 90% of the United States' 480,000 school buses run on diesel.

Nationally, the average price was $5.62 for a gallon as of Wednesday, according to AAA. This time last year, it cost $3.70.

School districts nationwide have been wrestling with the issue since spring, when the war with Iran started and fuel prices rose. A May survey produced by organizations that represent school superintendents and bus companies found that more than half the districts surveyed said diesel prices were already pushing them over budget.

In Washington state, Jacob Kuper, the Yakima School District's assistant superintendent of finance and operations, estimated that in the 2026-2027 school year, the higher cost of diesel could cost his district 38% more — or $130,000. "The equivalent of one teacher," he said.

So he looked for ways to reduce the district's diesel use. And he found a few: The district consolidated bus routes. It staggered bell times, reduced the number of total trips and put more kids on the same bus. "So then you save on the actual number of drivers you need," he said.

Kuper said that with those efforts, they're on track to save more money — about $400,000 to $500,000.

But as kids head back to school for the fall, those changes could still pose some problems. "You have fewer drivers with longer routes or longer total hours per day," he said. That means more difficult days for drivers.

Still, Kuper considers the Yakima School District lucky. "We're fortunate we have a small geographical footprint," he said, compared with more rural districts. Yakima's routes aren't that much longer, he said, so kids don't have to spend much more time waiting on a bus.

The May survey found that 40% of school districts were also consolidating their bus routes. About 20% reported they were limiting non-required trips, like field trips. Others said they were considering switching their yellow buses to non-diesel vehicles.

Education When is suspending students discrimination? Education Department renews an old fight Now, as schools reopen, districts will have to look for other ways to cut expenses, said Elleka Yost, director of advocacy and research at the Association of School Business Officials International, one of the organizations that conducted that survey. "Many districts are tapping reserves or rainy-day funds as a temporary solution," she wrote by email to NPR. But, she added, this may weaken districts' ability to respond to future financial challenges.

In Boise, Idaho, the school district has also looked for ways to reduce the number of stops per route. "Every stop adds mileage and cost," said Lanette Daw, the district's transportation supervisor.