Has a College Football game ever ended 15-5?
Yes. College Football has seen a final score of 15-5 5 times. It first happened on October 4, 1902, when Denver A.C. beat Denver, and most recently on November 22, 1913, when Harvard beat Yale.
That makes 15-5 the 1293rd most common final score out of 2,216 that have ever occurred in College Football. One point away, 16-5 has happened 28 times and 15-6 has happened 65 times. Nearly all of its occurrences fall between 1890 and 1919.