Most definitely. There were many Presidents who attended non-Ivy League universities:
•Thomas Jefferson: College of William and Mary, Williamsburg, Virginia
•James Monroe: College of William and Mary, Williamsburg, Virginia
•William Henry Harrison: Hampden-Sydney College, Hampden-Sydney, Virginia (Attended 1787-1790 but did not graduate)
•John Tyler: College of William and Mary, Williamsburg, Virginia
•James K. Polk: University of North Carolina, Chapel Hill, North Carolina
•Franklin Pierce: Bowdoin College, Brunswick, Maine
•James Buchanan: Dickinson College, Carlisle, Pennsylvania
•Ulysses S. Grant: United States Military Academy, West Point, New York
•Rutherford B. Hayes: Kenyon College, Gambier, Ohio
•James Garfield: Williams College, Williamstown, Massachusetts
•Chester A. Arthur: Union College, Schenectady, New York
•Benjamin Harrison: Miami University, Oxford, Ohio
•William McKinley: Allegheny College, Meadville, Pennsylvania
•William Howard Taft: University of Cincinnati Law School, Cincinnati, Ohio (Also earned a degree from the Ivy League’s Yale)
•Woodrow Wilson: Earned Ph.D from Johns Hopkins University, Baltimore, Maryland (Also earned a degree from the Ivy League’s Princeton)
•Warren G. Harding: Ohio Central College, Iberia, Ohio
•Calvin Coolidge: Amherst College, Amherst, Massachusetts
•Herbert Hoover: Stanford University, Palo Alto, California
•Dwight D. Eisenhower: United States Military Academy, West Point, New York
•Lyndon B. Johnson: Southwest Texas State Teachers College, San Marcos, Texas
•Richard Nixon: Whittier College, Whittier, California; Duke University Law School, Durham, North Carolina
•Gerald Ford: University of Michigan, Ann Arbor, Michigan (Also earned a degree from the Ivy League’s Yale University Law School)
•Jimmy Carter: United States Naval Academy, Annapolis, Maryland
•Ronald Reagan: Eureka College, Eureka, Illinois
•Bill Clinton: Georgetown University, Washington, D.C. (Also spent two years at Oxford University in England and earned a law degree from the Ivy League’s Yale University Law School)
•Barack Obama: Spent two years at Occidental College, Los Angeles, California before transferring and earning degrees from the Ivy league’s Columbia University and Harvard Law School
•Jefferson Davis: Transylvania University, Lexington, Kentucky before transferring and graduating from the United States Military Academy, West Point, New York