University of Massachusetts trustees on Wednesday approved a plan that will freeze next year's tuition at its current level for in-state students at its four undergraduate campuses, while raising medical school tuition and out-of-state tuition at UMass Amherst each by 1.5 percent.

Tuition for out-of-state students at the Boston, Dartmouth and Lowell campuses will not increase.

Trustee Stephen Karam, who chairs the board's Administration and Finance Committee, said trustees usually set tuition levels at a summer meeting.

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"By doing it now, our campuses will be able to provide more certainty to our students about the cost of attending one of our campuses and hopefully give them a more competitive edge in recruiting and retaining our students," he said.

Student trustee Timothy Scalona, a master's of public policy student at UMass Amherst, cast the lone "no" vote. He said he understood that the university faces financial challenges arising from the COVID-19 crisis but said raising out-of-state tuition at the Amherst campus was "not something that I feel like I can vote for, as a student representative."

Karam and trustees Michael O'Brian, Imari Paris Jeffries, and Julie Ramos Gagliardi abstained from the vote, saying they have children attending UMass.

The average in-state undergraduate tuition at UMass, before financial aid, works out to $14,722 over the past two years, system officials have said. UMass President Marty Meehan said that a tuition freeze next year means the school will forego more than $14 million in revenue it might have otherwise collected.

Officials said the net price of a UMass education, or the price minus financial aid, "remains consistent with other New England public land-grant universities and 31 percent below peer private institutions." At $352 million this fiscal year, institutionally funded financial aid at UMass is at a record high, accounts for 40 percent of the total aid UMass students receive, and has increased by $116 million, or 49 percent, since fiscal 2015.