A safe assumption is if your kids are in school the parks will be less crowded. Most families take their vacations around their kid’s school schedule. Another good clue is to look at the seasonal pass blackout dates. Typically the parks are the most crowded on the days that are blacked out.
Blackout dates for 2005
March 19-April 1
June 11-August 18
December 22-January 5(2006)