It's an individual thing and I think the answers are all across the board.  Mine have never crowed before 16 weeks or so, but I know others have had them test their vocal cords before they're even out of the brooder.
	
		
			
		
		
	
				
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Ok, lets sound dumb here...My babies are all now 23wks going on 24. My leghorns all 3 started crowing at about 16wks...Im sooo new into chickens, infact when we got these all 17 of them..they were 3days old I think.  so if you have read another post I put up....
	
, and THEY NEVER HAVE CROWED not even to this day
!!!! one just did yesterday for the first time. And they are HUGE!!!! I want to say they are Americaunas? but Im not sure.