A trained weather spotter near Estes Park measured 24 inches of snow on the morning of May 6, 2026, the kind of total that would be noteworthy in January. In May, it was staggering. The late-season storm that swept across the Colorado Rockies during the first week of the month forced the National Weather Service to issue winter storm warnings along a roughly 180-mile corridor from southeastern Wyoming to the Colorado Springs metro area, burying Front Range foothills and high-elevation terrain in heavy, wet snow at a time when mountain towns are normally gearing up for summer tourism.
Where the heaviest snow fell
The 24-inch measurement near Estes Park, logged in the National Operational Hydrologic Remote Sensing Center’s snowfall analysis for the Central Rockies, represents the storm’s confirmed peak. The reading came from a trained spotter, the same class of volunteer observer that NWS offices rely on to verify forecasts after every major storm. The heaviest accumulations concentrated along the Continental Divide and in the foothills west of the I-25 corridor rather than in the lower-elevation suburbs.
Boulder picked up roughly 11 inches according to the NWS Denver/Boulder office’s Public Information Statement on May 7, with additional totals reported across the northern Front Range and adjacent foothills. Farther south, the NWS Pueblo office documented measurable snow in Colorado Springs, Monument, and Black Forest on May 6, confirming the storm pushed well into the state’s second-largest metro area.
On the northern end of the warning zone, the NWS Cheyenne office warned of 10 to 20 inches in southeastern Wyoming’s high terrain, with blowing snow cutting visibility. Post-storm verification totals for specific Wyoming locations had not yet appeared in NWS products as of early May 2026, so those projected figures remain forecasts rather than confirmed measurements.
A storm that caught the season off guard
May snow is not unheard of along Colorado’s Front Range. Denver’s average last measurable snowfall typically lands in late April, and the city has recorded snow as late as mid-June. But a storm capable of dropping two feet at a single location and triggering winter storm warnings across a 180-mile swath is a different animal. Events of this magnitude in May are rare enough that they tend to catch travelers, hikers, and even some locals off guard.
The Weather Prediction Center had flagged elevated snow probabilities across the central Rockies days before the storm hit, giving local emergency managers lead time to prepare. Rocky Mountain National Park posted a weather advisory on May 6 directing visitors to NWS forecasts, a step the Park Service reserves for conditions it considers genuinely dangerous. Trail Ridge Road, the park’s famous alpine highway that tops out above 12,000 feet, is often still closed in early May due to seasonal plowing schedules, so the storm’s effect on visitor access is difficult to separate from routine closures without further detail from the Park Service.
What the data does and does not show
The strongest evidence for this storm comes from three NWS products: the Pueblo and Denver/Boulder Public Information Statements and the NOHRSC snowfall analysis. Each compiles ground observations from trained spotters, cooperative observers, and automated stations. These are direct measurements, not model estimates or satellite approximations, and they form the most reliable record of what actually fell.
That said, gaps remain. No NWS product reviewed for this event includes statements from local emergency managers about specific road closures, power outages, school closures, flight cancellations, or livestock and agriculture effects. The Estes Park total, while collected by a trained spotter using standard NWS protocols, has not been independently corroborated by a second measurement at the same site. And whether the storm broke any official May snowfall records in Boulder, Colorado Springs, or Estes Park has not been confirmed in the available climate data.
Rocky Mountain National Park’s advisory confirmed hazardous conditions but did not specify visitor counts, campground evacuations, or closure durations. For the Wyoming portion of the warning corridor, the absence of post-storm verification means the projected 10-to-20-inch range should be treated as an expected outcome rather than a measured one.
Driving the I-25 corridor and heading into the high country
For anyone planning to drive the I-25 corridor between Cheyenne and Colorado Springs or head into the mountains in the days following this storm, the NWS offices in Denver/Boulder, Pueblo, and Cheyenne are the most reliable sources for updated road conditions and lingering hazards. High-elevation passes and park roads above 7,000 feet may remain snow-covered or closed well after skies clear. Chains or winter tires are not optional at those altitudes in early May, and hikers should expect trail conditions more typical of March than late spring.
Storms like this one serve as a reminder that Colorado’s mountains operate on their own calendar. The ski resorts may have closed weeks ago, but the atmosphere did not get the memo.
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*This article was researched with the help of AI, with human editors creating the final content.
