In high school, we were all called back into the tryout room one by one afterwards and they would tell us what team we made (or didn't make). And they would usually give some sort of comment of what they liked (Mine was that the judges were very impressed with my high standing tuck :p)or what they would like to see you improve on for next year, if you didn't make the team, or if you made JV and you wanted Varsity they would tell you why.
For college, about two weeks after the final tryouts we got emails that had the subject "Tryout letter" and it said something like, here is your attached tryout letter, if you have an questions ask me. Then there was a letter that was attached that said Congrats, blah blah blah. I'm assuming the one for people that didn't make it said something along the lines of "We had a very talented group of girls tryout, but unfortunately we are not able to offer you a spot on the team at the time blah blah blah"