I live in a neighboring state and we have many students that go to school in Colorado. Colorado has 3 major public universities, University of Colorado at Boulder, Colorado State University, and the somewhat smaller University of Northern Colorado. Also the much smaller Colorado School of Mines, mainly for engineering majors. There is also a private University of Denver. Most of the kids I know are at Colorado State because it is considerably cheaper for OOS students than UC Boulder and merit scholarship money is much easier to get.
All have posted application deadlines that are past for Fall 2016 admissions, but Colorado State specifically states that new applications will be considered on a space-available basis. Many schools have this policy even if they don’t advertise it. Best to call and ask.
These are all respectable schools. It really depends on what the student is looking for.