In Utah it is 3 years. I don't know what it is in Colorado. If you "Google" this question, you might find out: "Within how many years after decedent's death must the will be probated in Colorado." If that doesn't get you the answer you're looking for, find a listing of Colorado attorneys that handle probate cases and call a few of them. Usually, a legal secretary or paralegal in the office will be able to answer a simple question like this.