Boulder, Colorado, is celebrated for its sunny days and outdoor lifestyle, but it has also faced some extreme weather over the years. On January 17, 1930, Boulder experienced its coldest recorded temperature when the mercury plunged to -33°F (-36°C). This frigid day remains the coldest on record for the city, marking a moment of historical significance for Boulder’s resilient residents.

On that day, a severe Arctic air mass swept across Colorado, bringing dangerous cold to the entire region. Boulder’s location at the base of the Rocky Mountains, combined with its elevation of approximately 5,430 feet, made the city particularly susceptible to this deep freeze. While Boulder typically enjoys an average January low of 20°F, the record-setting cold in 1930 showcased the extremes of the region’s dynamic weather.

Boulder has also seen other notable cold spells. For instance, the temperature dipped to -28°F on February 8, 1936, and -24°F on December 22, 1990. While these events are rare, they remind us of the importance of preparation for extreme weather.

For those navigating Boulder’s winter conditions, staying safe during extreme cold is essential:

• Limit Outdoor Time: Avoid prolonged exposure to prevent frostbite or hypothermia.
• Dress Warmly: Layering clothing helps trap heat, keeping you warm in freezing conditions.
• Paw Protection for Pets: Dogs and other pets should have limited exposure, and their paws should be protected from ice and snow.
• Prepare Your Home: Insulate pipes to prevent freezing, and ensure your heating system is reliable.

Boulder’s coldest day is a testament to the city’s resilience. While extreme weather is part of life in the Rockies, the community continues to thrive, adapting to and embracing these unique challenges.

To learn more about Boulder’s historical weather data, visit the National Weather Service page or explore detailed records from Extreme Weather Watch, which provide comprehensive insights into the city’s weather extremes and historical trends.

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