This year the Center on Education Policy (CEP) analyzed data on the achievement of different groups of students in two distinct ways. First, it looked at grade 4 test results to determine whether the performance of various groups improved at three achievement levels--basic and above, proficient and above, and advanced. Second, it looked at gaps between these groups at the proficient level across three grades (grade 4, grade 8 in most cases, and a high school grade). These two types of analyses show whether elementary school achievement has generally gone up for different groups of students and whether achievement gaps at different grade levels have narrowed, widened, or stayed the same. This paper profiles the student subgroup achievement and gap trends in Colorado. Overall, Colorado showed clear trends upward at the proficient level. Most achievement gaps are narrowing according to the percentage proficient measure; mean scale scores showed less positive results for math achievement gaps. (Contains 9 tables.) [For the main report, "State Test Score Trends through 2007-08, Part 3: Are Achievement Gaps Closing and Is Achievement Rising for All?", see ED507909.]