Below freezing temperatures can cripple people as soon as they step outside, but some people are also trying to stay warm inside their homes.
As the temperatures drop heating bills usually rise. Some people who need help paying them started applying for assistance on Thursday.
A Denver woman has died from carbon monoxide poisoning while she was trying to heat her home with a gas generator.
Low-income residents can begin applying for assistance with their home heating bills, but the requirements will be tougher this year. The Low-income Energy Assistance Program will begin accepting applications on Tuesday.
Winter will make its way into Colorado on Tuesday, when some parts of the region may see snow. The program that helps people heat their homes is short on funding.