UC Davis accepts a wide range of grades, but doesn't explicitly publish a minimum GPA requirement. Instead, they use a holistic review process considering your entire application. While a high GPA significantly improves your chances, admission isn't solely based on grades. Factors like your course rigor (AP, IB, Honors courses), standardized test scores (though currently test-optional), extracurricular activities, letters of recommendation, essays, and demonstrated interest all play a role.
In short, there's no specific GPA cutoff. A highly competitive applicant will generally have a GPA of 3.8 or higher, but even with a lower GPA, a strong application in other areas can still be considered.