The long-term unemployed are still unable to find jobs, while some employers are struggling to find qualified workers.
The state's unemployment rate is at just 2.8 percent and job growth has accelerated, perplexing economists.
The drop of two-tenths of a percent reflects slightly more participation in the workforce.
With unemployment hovering around 2 percent in Colorado there are a lot of such job openings, but not enough people to fill them.
Wage growth was up almost 4.6 percent — well above inflation — and wages have been rising for almost a year now.
Colorado's employment rate is the 10th lowest in the United States at 3 percent.
The Centennial State ranked fifth in the nation for job growth, easing some concerns that the low unemployment rate would hurt hiring.
The state’s rate rose slightly to 3.1 percent in December 2017, because more people entered the workforce than obtained jobs.
Employers added 1,800 jobs October to November, but more people entered the labor force than jobs were created, so the state’s unemployment rate rose two-tenths of a percent.