Colorado courts require that at least one spouse be domiciled in Colorado for a minimum of 91 days before the case begins. The state is strictly no-fault, so the court must also find that the marriage is irretrievably broken. After the respondent is served or appears, the court must then wait at least 91 days before entering a decree. This waiting period runs from service, joinder as co-petitioner, or a formal appearance. These jurisdiction and timing rules apply to both dissolution and legal separation. Courts also use this window to address parental responsibilities, support, maintenance, and property if within their jurisdiction.