Proponents argue that too much knowledge is lost while American kids wile away the summer months apart from their lessons. The National Summer Learning Association cites decades of research that shows students' test scores are higher in the same subjects at the beginning of the summer than at the end.
"The research is very clear about that," said Charles Ballinger, executive director emeritus of the National Association for Year-Round School in San Diego. "The only ones who don't lose are the upper 10 to 15 percent of the student body. Those tend to be gifted, college-bound, they're natural learners who will learn wherever they are."
Supporters also say a longer school year would give poor children more access to school-provided healthy meals.
Yet the movement has plenty of detractors — so many that Ballinger sometimes feels like the Grinch trying to steal Christmas.
"I had a parent at one meeting say, 'I want my child to lie on his back in the grass watching the clouds in the sky during the day and the moon and stars at night,'" Ballinger recalled. "I thought, 'Oh, my. Most kids do that for two, three, maybe four days, then say, 'What's next?''"
But opponents aren't simply dreamy romantics.