I went last summer June 5-9 and July 6-10. July is slightly more hot, but we take pool breaks. Crowds were WAY less in July. I could not believe it. There was no one in the parks around the 4th last year. I think it was because the 4 day magic ticket was blocked on the 4th last year but not this year so it may be crowded this year between the 4 day magic ticket and the free dining.