Colorado doesn’t have joint or sole custody, but instead, the term parental responsibility is used.  Parental responsibility can either be joint or primary.  Joint parental responsibility is characterized by equally sharing in overnight visitation with the minor.  If one parent maintains less than 90 overnight visitations with the minor, the other parent is maintaining primary parental responsibility.
Additionally, Colorado separates decision-making responsibilities from residential responsibilities.  Joint decision-making is when both parents are required to jointly make decisions dealing with education, religion, extracurricular activities, and medicine.  In a sole decision-making situation, one parent is able to make all these decisions without consulting the other parent.