The nearly 60-degree drop in temperature in the centennial state means rare sights from late-spring storms that promise to cover ground with snow in parts of the state.
More than a foot of snow fell in places like the Black Forest and Aspen Park.
As of Saturday morning, more than 50,000 were without electricity.
By Friday afternoon, the frozen rain started in large parts of the state.
Videos from communities such as Castle Rock, Lone Tree and Aurora showed the first coming down.
Photos of high altitude areas show significantly more snow on the ground, but a very similar scene with grassy areas accumulating more frozen precipitation than roadways.
National Weather Service meteorologists said that since the state is so hot, it will take some time for the snow to settle on the sidewalks.
The pavement temperature from the Loveland Pass area was about 40 degrees F, allowing the frozen rain to melt quickly.
Officials warned that dangerous travel conditions were expected along the high-altitude I-70 corridor by Saturday morning.
Bad weather forced Major League Baseball to postpone the game between the Colorado Rockies and New York Mets until at least Saturday afternoon.
By the time the event is over, forecast models show Denver could pick up five inches of snow over a foot at higher elevations.