Probation is pretty different from having warrents. I was just put on unsupervised probation in mass and was told (by my lawyer and parole officer) I'm free to leave the state to visit people, I just have to notify them within 48hrs of moving of changing jobs. Since I'm unsupervised (meaning I won't be called in for random drug screens and what not) they basically never intend on calling me in, unless I'm arrested again. If you are being randomly tested however, you could get fucked for not reporting if they try to call you in, which would lead to warrants, which would mean you could possibly be extradited if you get your shit run by the cops, but by what mouse and clit said, that doesn't seem very likely. A good friend of mine got extradited from montana to georgia, but he was wanted on felony drug violations. Find out if a probation violation is more than a misdemeanor is colorado, if its not, I'd just leave.