Presumable you have seen the "Colorado Gun Rights" tri-fold brochure which has some statements on this but not quite sure how thorough it is. I do not have before me the link to it but maybe can find it if need be.
From the brochure....
"C.R.S. 18-12-105.5 permits a valid CHP holder to have a handgun in his vehicle on school grounds as long as the gun remains in the vehicle (it must be in a compartment in the vehicle and the vehicle must be locked if it is unoccupied). Unlawful possession on school gronds is a class 6 felony.
A valid CHP also provides an exemption from the federal 1000' gun-free zone law. A CHP holder may carry concealed or openly within the 1000' zone."
Not sure if that completely answers for you.
You might look up that C.R.S. number to read the actual legal wording.