There are no NCAA restrictions on 4 yr schools contacting JuCo players - to the best of my knowledge. However, early contact is usually initiated by the JuCo player as 4 yr schools often don’t want to piss off the JuCo HC by contacting his players prematurely. So it’s more a courtesy than a restriction. My son just completed his freshman year of JuCo ball. He is going back for his Soph year but he has been contacted by 4 yr schools that have expressed interest in him. Sometimes contact goes thru the JuCo HC and sometimes it doesn’t. But trust me on this, you want to leave a JuCo in good standing w/ the JuCo HC. I have heard way too many stories of JuCo HCs trying to bury players that leave on terms that haven’t been blessed.