The mark for cutoff, the last 2 years any, has been around 100. For football, that process will change next year due to the addition of the 11 man programs. Participation in most schools is difficult to predict. Some of the TCAF schools with as low as 45 (hs) have as many as 22 players, while others, such as some of the charters have 200 plus and may have only 12 players. There are lots of reason for the differences, far too many to hit on here.
