Can I move without his consent from Wisconsin to Colorado since I have custody?

The answer to your question requires review of the court order that says you "have custody", if there is one, and Wisconsin law. If there is no court order and no Wisconsin statute, you can do whatever you please. It isn't clear why you think you might need "his" (whoever that is) consent, but only a lawyer in WI can tell what WI law requires. It is unlikely that there is any WI statute that applies to your situation if there is not a court order establishing each parent's rights and responsibilities, but only a WI lawyer can answer that for you.