Only for athletics, and it may vary by league. Here is information I have directly from one ISL school:
“Our school competes in the Independent School League (ISL). The ISL rules that coaches cannot initiate contact with players from February 10th - March 10th. If a player reaches out to the coach during this time, the coach can respond.”
My initial post was incorrect…the quiet period begins Feb 10th. But again, I would check with each school on this, as each league likely has their own rules.