Most schools in the United States do not operate as year-round schools. As of 2013, some key statistics regarding year-round schools include 3,181 students are enrolled in year-round schools in the United States, 10 percent of the eligible population are enrolled in year-round schools and 49.7 percent of schools in other countries participate in year-round schools.

The dropout rate for year-round schools is 2 percent. This is significantly lower than non-year-round schools, which have a drop out rate of 5 percent. In a study conducted in 1996 of three year-round and three non-year-round schools, the year-round schools reported higher gains in both math and reading. Year-round schools had a math gain of 10.05 percent and a reading gain of 10.52 percent. Comparably, non-year-round schools had a math gain of only 7.71 percent and a reading gain of 8.91 percent.

Between the years of 1983 and 2003, there was a 544 percent increase in year-round schools. Across the nation, year-round schools were much more prevalent in elementary schools than in high schools or middle schools. As of 2007, California had the highest number of students enrolled in year-round schools with 2,127 students attending the schools. Hawaii was a distant second with only 296 students.