Idaho failed to score in the shootout, and Colorado finished off a sweep of the Steelheads in ECHL action Saturday night.
The game was 3-3 after regulation and overtime.
Anthony Luciani scored twice, and Jefferson Dahl scored once. Idaho goalie Philippe Desrosiers turned away 44 shots for Idaho (13-8-3), which has lost three straight.
The Steelheads will try and bounce back when they host Rapid City on Wednesday night at CenturyLink Arena.