The National Weather Service (NWS) in Denver issued a winter storm warning at 2:14 p.m. on May 5, 2025. This warning affects high-elevation areas over 9,000 feet in northern Colorado. It covers parts of Jackson, Larimer, Grand, Boulder, Gilpin, Clear Creek, Summit, and Park counties.
Forecast Details:
Heavy snow is expected, with total snow accumulations ranging from 12 to 22 inches. The heaviest snowfall will likely occur along the crest and eastern slopes of the Front Range. Snowfall will be much lighter in valley areas such as those between Summit County and Vail Pass. 
Timing:
The storm warning begins at 6 a.m. Tuesday, May 6, and ends at 6 a.m. Wednesday, May 7. Light snow could start Monday night. Slushy conditions are likely on higher mountain passes.
Travel Impacts:
Difficult travel conditions are anticipated, especially during the late Tuesday morning and evening commutes. Major roadways affected may include:
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Interstate 70 east of the Eisenhower Tunnel
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The Peak to Peak Highway
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U.S. Highway 40 and Berthoud Pass
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Highway 14 near and east of Cameron Pass
What the Warning Means:
A winter storm warning is issued when significant snow, sleet, or ice is expected and poses a risk to travel and safety. In contrast:
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A winter storm watch means such conditions are possible—stay alert.
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A winter weather advisory means wintry weather is expected—use caution.
The NWS notes that warning thresholds vary by region. In Northern Colorado, 12 inches of snow is typical. In other areas, people see that amount as extreme.
Residents in the affected areas should prepare for hazardous winter driving and stay updated with local forecasts.
