Not so much closed, more like un-invited.
With the open fencing around the practice fields it's not like some places that have an actual "closed practice".
Dickey Practice Fields fencing: http://www.meangreenmap.com/practice.html
Louisville practice fields fencing: http://uoflcardgame.com/overflow-crowds-at-uofl-football-practices/39281/
Old NTSU days of practice at Fouts (love those helmets!): http://texashistory.unt.edu/ark:/67531/metapth164801/m1/1/
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NT80's post in North Texas 2014 Practice Schedule? was marked as the answer