When do colleges release their 2017 acceptance rates?

Applying to College
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2

Many already have, you may have to google individual schools you are interested in. For example, USC:

https://news.usc.edu/119065/trojan-family-welcomes-8980-exceptional-students-for-fall-2017-admission/

But the full freshman profiles should come out in late July/early August for most schools, when everything is settled. This is for this past year:

https://about.usc.edu/files/2016/10/Freshman-Profile-2016.pdf