Rivers Cuomo and band assistant Sarah Kim suffered minor injuries when the group's tour bus skidded on ice, struck a guide rail and slid into a ditch Sunday morning.
Cuomo and Kim were hospitalized after the accident in the upstate New York town of Glen. That's about 40 miles west of Albany. They were traveling to a show in Boston.
Cuomo's condition isn't clear.
A message on the band's Web site says Weezer is canceling the rest of its Raditude tour and will try to reschedule those dates.
Calls and e-mails to publicist Jim Merlis weren't immediately returned Monday.