Spring break does vary across the country. I am from New England and NE schools typically have two vacations, one that starts during president's day (feb 19 this year) and and the other in mid April. (Colleges/Univ in NE actually have a March or April break). I have always tried to go on vacation before that period to avoid crowds, but have been on break. during the last week of feb into early March and the crowds do increase a bit at WDW during President's week, but nothing like it is in the summer and thanksgiving and Christmas, when crowds peak. You might notice that Disney increases their room rates to peak on Feb 17, which I suspect reflects the increase in demands for rooms/park attendance. We love this time of year, and if you follow some of the great tips in Birnbaum's for how to get around the parks you might avoid some crowds. Even though we try to go on off season, the last time we were at WDW, we were sandwiched into AK on an extra magic hour morning and left at noon due to crowds. The next day we went to MK and started in Frontierland during EMH and rode Splash Mtn, BTR and Pirates over and over again with no lines. This was the second week in feb! Hope this helps. Have a super time!