Colorado will have a long stretch of below freezing and below-zero wind chills, with several inches of snow likely as well.

Still, several Colorado school districts will start late on Tuesday as the state waits out the last of subzero temperatures.

A polar vortex will plunge Colorado into bitter, sub-zero cold this weekend and could bring up to 10 inches of snow in some parts of the Denver metro, National Weather Service meteorologists say.

Here is what is and isn't a polar vortex when Colorado receives cold like what is forecast for the holiday weekend.

Here are the lowest temperatures across Colorado on Tuesday morning, according to the National Weather Service.

RELATED: Everything you need to know about the polar vortex bringing extreme cold to Colorado A high of 14 was forecast Saturday in Denver, falling to 6 degrees below zero overnight, according to ...

A polar vortex is currently hitting the United States, with schools closed in many areas and at least four deaths caused by ...

The Arctic air mass will be in Colorado Friday afternoon, but the effects of the polar vortex won't be fully felt until after the sun goes down. Snow will come into the state's high country in two ...

Colorado will see its coldest temperatures of the winter as a mass of cold air descends on the state from the Artic. But despite the bitter cold, this weather event is not a polar vortex.