Current CSU student here - yeah, this is their first year doing interviews in a looooooong time, and everybody (OOS, WICHE, IS, combined programs) must interview. Not sure if they have plans for rescheduling interviews or offering flexibility in the interview times applicants can pick or anything. I'm also not sure if they have contingencies in place for inclement weather, though I would imagine that they've at least thought about it given that interviews are in January and if weather is extremely terrible the I-25 tends to get shut down. We don't usually get bad snows until later in the spring though, so that shouldn't realistically be a huge issue.
Also, my god, getting from DIA to FoCo is such a pain sometimes. I hate how far away the airport is.