Winter finally showed up in style this week along the Front Range. After a sluggish start to the season, our first true snowstorm delivered nearly 18 hours of steady flakes, painting Boulder, Denver, and much of Colorado in white. But this wasn’t just a simple upslope event—there were some fascinating atmospheric twists that kept the snow machine running longer than expected. We review the storm setup and snowfall totals which greatly favored the western side of the Metro area including Boulder.
Author: BoulderCAST Team (Page 2 of 45)
This post had major contributions from at least two members of our team. The more meteorologists the better, right?
A few snowflakes fell across the area Sunday evening with some jet-forced snow bands around. These were largely south of Denver leaving just a trace of snow for most of us. The Mountains made out better with several inches of orographic snow piling up under moist northwesterly flow. We briefly review both the snow totals from this single storm and the seasonal ones.
Boulder’s long snow drought has finally ended—just shy of a record streak. An Arctic front swept through early Saturday, dropping temps fast and delivering the season’s first flakes. Boulder picked up 0.3″, the latest first snowfall ever recorded in the city and it wasn’t even close. Curious how our forecast stacked up and what’s next? Spoiler: Another round of snow is already knocking on the door for Sunday.
It’s been a tricky week for the weather models — and for us forecasters trying to make sense of it all. Our latest storm system has kept everyone on their toes, thanks to a complicated dance between two low-pressure systems across the Southwest. Each new model run seemed to rewrite the story, with big swings in outcomes and plenty of disagreement between guidance. But now that the storm is closing in, confidence is finally improving: we’re looking at a light precipitation event for the Front Range, with rain the only worry across the lower elevations.
October 2025 was definitively warm and dry throughout the Front Range with the primary storm track remaining well north across Wyoming and Montana. The only real precipitation event during the month occurred on October 6th with some locations picking up more than one half inch of rain. Our first frost of the season occurred about two weeks later than normal, and to this day we’re still waiting for those magical first snowflakes across the lower elevations. Here’s a quick and colorful graphical recap of our weather during October and how it relates to climatology.
11th Annual BoulderCAST First Snowfall Contest
Ready to toss that first snowball of the season? Maybe you’ve already waxed your skis, shelled out for that pricey Epic Pass, or jumped the gun on snow tires (again). Well, hold onto your mittens—Boulder’s first big snow could be just around the corner, or not! Mother Nature has been playing tricks on us lately. In the past five years alone, we’ve seen both the earliest and latest first snows on record. But, what will 2025 bring? That’s where you come in.
We’re kicking off our annual First Snow Contest! Please take a look at Boulder’s snowfall history within, then submit your best guess for when the first measurable snow (≥0.1″) will fall in Boulder—and how much will accumulate. The closest guesses will win a selection of prizes!
*This contest is now closed to entries*
September 2025 brought a classic Colorado blend to Boulder and the Front Range: near-normal temps, wetter-than-average skies, and a lively mix of sunshine and storms. A standout precipitation event around the 23rd delivered soaking rain in the lowlands and the first real coating of snow to the Mountains. The month eased us gently into autumn, with crisp mornings, comfortable afternoons, and brilliant foliage lighting up the higher terrain. And yes—who could forget that dramatic wave of Canadian wildfire smoke that swept through, reminding us how connected we are to the broader arid landscape of western North America. Here’s a quick and colorful graphical recap of our weather during September and how it relates to climatology.
August 2025 was on track to be our third scorcher in a row — hot, dry, and smoky — until a late-month shift brought in a welcome stretch of cooler, wetter weather. That pattern change helped balance things out across the Front Range, with most areas landing close to average for rainfall and just slightly warmer than normal overall. Still, it wasn’t all relief: the month packed in plenty of wildfire smoke and a few record-breaking heat days that served to remind us that summer wasn’t done yet. Here’s a quick and colorful graphical recap of our weather during August and how it relates to climatology.
NOTE: This monthly recap was delayed due to missing data in the August 2025 climate record for Boulder which has since been partially filled with best-guess approximations.
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