Boulder County is bracing for a sharp punch of Arctic air, bringing some of the coldest temperatures of the winter so far. After an unusually mild season, this sudden shift is expected to deliver sub-zero wind chills, light snowfall, and several days where temperatures stay below freezing — a combination that can catch people off guard if they’re not prepared.

According to the National Weather Service, wind chills in Boulder are expected to dip to around 3 degrees below zero, with nearby Longmont feeling even colder at roughly 6 below. Snowfall totals are forecast to remain modest, generally between one and three inches on Friday, but the cold will linger well beyond the snow itself, with overnight lows and daytime highs staying below freezing from Thursday night through early Monday.

This kind of weather isn’t unusual for Colorado, but its sudden arrival makes preparation especially important.

How to Stay Warm During Boulder’s Arctic Cold

Wind chill, not snowfall, will be the biggest factor during this cold snap. Even brief trips outside can feel much colder than expected, especially in open areas near the foothills or along exposed streets.

Wearing multiple layers is key, particularly insulating layers that block wind. Hats, gloves, and warm footwear aren’t optional during sub-zero wind chills — they are essential. Many people underestimate how quickly heat can be lost during short errands, dog walks, or commutes, especially in the early morning and evening hours.

If you’re spending time outdoors, even casually walking Pearl Street or heading across campus, take extra precautions and limit exposure when possible.

Protecting Your Home and Pipes From Freezing

One of the most common problems during prolonged cold stretches in Boulder is frozen pipes. When temperatures stay below freezing for several days in a row, the risk increases significantly.

Allowing faucets to drip slightly overnight can help prevent pipes from freezing, particularly those connected to exterior walls. Opening cabinet doors under sinks allows warmer air to circulate around plumbing. It’s also wise to keep your home’s thermostat set consistently, even overnight, rather than turning the heat down too low.

If you have plumbing in garages, basements, or crawl spaces, pay special attention to those areas. Knowing where your main water shutoff is located can also save time and damage if a pipe does freeze.

Driving and Getting Around Safely

While snowfall amounts are expected to be relatively light, refreezing will be a concern. Roads that appear clear during the day can quickly become slick once temperatures drop after sunset.

Give yourself extra time, especially during early morning hours when ice is hardest to see. Bridges, shaded roads, and less-traveled side streets tend to freeze first. Even experienced winter drivers should take it slow during Arctic conditions like these.

Looking Ahead

Temperatures are expected to remain below freezing through Monday morning, with daytime highs finally rebounding into the 40s later Monday, according to AccuWeather. Until then, the key is steady preparation rather than panic.

Boulder residents are accustomed to winter weather, but sudden cold snaps like this one are a reminder that small steps — layering up, protecting pipes, and slowing down — make a big difference. Staying prepared helps keep the community safe and comfortable until warmer air returns.

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