Has an NCAA Baseball game ever ended 31-4?
Exactly once. On May 1, 2010, Bradley beat Calumet 31-4, and no NCAA Baseball game before or since has ended that way. When it happened it was a scorigami, the first 31-4 in league history.
That makes 31-4 the 457th most common final score out of 531 that have ever occurred in NCAA Baseball. One point away, 32-4 has happened 8 times and 31-5 has happened 3 times.