The open-government group Californians Aware says Stanislaus County Superior Court Judge Roger Beauchesne decided Wednesday that the university must release Palin's contract.
The group says the judge also ordered the release of any documents related to the use of university property or services during her visit.
CalAware filed a lawsuit in April after the school refused to disclose documents related to Palin's appearance.
The university has said negotiations with Palin were handled by its nonprofit foundation, which is not subject to the California Public Records Act.
The university did not immediately respond to requests for comment Wednesday evening.