I googled this once and as far as colleges go, it's something like 250,000 kids off each week the starting the last 2 weeks of Feb. and then the 1 million plus each week the first three weeks of March and then around 500,000 the last week of March and 100,000 the first week of April. That's just colleges. In my home state, all our public schools for grades k-12 have spring breaks the end of February and then another week off either one of the last two weeks of April off. So, depends on your area, I would do as another suggested and find out the local area's schools schedule and take that into consideration along with all the colleges. Just our personal preference, but we never travel the month of March if we can help it.