most sports have 2 signing periods. For wrestling, the early signing period was in November. That is when colleges can officially offer a letter of intent which is a written contract to the student athlete. After the short early signing period, colleges cannot offer a formal letter. Athletes can verbally commit but there is nothing signed. For wrestling, in April, is the other signing period where again, colleges can offer a formal written contract. There are many other specific rules that can be found on the ncaa website.