Illinois, welcome to HSBBW! You'll find the answer to many questions by doing a search on this message board. Simply click on the green "Find" button at the top left portion of this page and type in a key word or phrase that describes a subject you're interested.
Regarding your question posted, here is the timeline for "official" recruiting:
* Sept. 1 of player's junior year - colleges can begin sending letters
* July 1 following players' junior year - colleges can begin making weekly calls
"Unofficially," recruiting and offers can occur way earlier and in many forms:
* A college can recruit a player when he is on campus for an unofficial visit, at a game on campus, or at a camp/showcase
* At any time during a player's high school years, a college can call the player's coach or select director and have them ask the player to call the college. If the player initiates the call, the college can recruit and make an offer.
* I believe NCAA rules still allow a college college to email players at any time -- not just after Sept. 1 of junior year.
I hope this answers your questions.