The Colorado Department of Education says 72.4 percent of the class of 2010 graduated high school within four years, up from 70.7 percent of the class of 2009.
Including students who took longer than four years, 74.6 percent of the Colorado class of 2009 graduated high school. So far 73.3 percent of the class of 2010 has finished.
The department said Wednesday that the on-time graduation rate in the class of 2010 was 50.1 percent for Native Americans; 82.4 percent for Asian students; 63.7 percent for black students; 55.5 percent for Hispanic students; and 80.2 percent for white students.
The department says 76.3 percent of girls and 68.7 percent of boys graduated on time.
The dropout rate was measured at 3.1 percent, down from 3.6 percent the previous school year.