Lead: A dramatic temperature swing moved through Colorado on Saturday, Dec. 25, 2025, with daytime highs near 59°F before a strong cold front arrived late that night around 10:00 p.m. MST. The front produced rapidly falling temperatures — forecast highs close to 29°F on Sunday — and brought accumulating snow from the high country into the Front Range and urban corridor. Snow developed in mountain areas early Saturday and intensified during the evening commute, creating travel hazards on mountain passes and along the I-70 corridor. Forecasters expect notable storm totals in the high country and measurable accumulations into the Denver metro area.
Key takeaways
- High temperatures reached about 59°F on Saturday, Dec. 25, 2025, before a strong cold front moved through around 10:00 p.m. MST.
- Temperatures are expected to drop sharply, with Sunday daytime highs only near 29°F across much of the state.
- Snow developed in the high country early Saturday and intensified through the evening; travel may be hazardous at mountain-pass elevations and on I-70 during the Saturday evening commute.
- Storm totals of 4 to 8 inches are forecast across much of the high country, with localized amounts up to 14 inches at mountain-pass elevations in the northern ranges and the highest peaks.
- Foothills could see up to 5 inches, while the Denver metro is forecast for around 4 inches of accumulation, with initial melting producing wet, slushy accumulations.
- Snow levels are expected to lower quickly Saturday night into Sunday morning, allowing accumulations from Fort Collins south through Boulder, Denver, Castle Rock, Colorado Springs and down to the southern border.
Background
Late-December weather in Colorado often features sharp temperature contrasts as Pacific and Arctic air masses interact over the Interior West. This event began with an unusually warm airmass for the region on Saturday, producing near-record daytime readings in many low-elevation locations. Such warm-to-cold transitions are not uncommon in the state, but the magnitude and timing — with warmth through the daytime followed by a fast-moving cold front at night — amplified impacts on travel and snow accumulation patterns.
Colorado’s topography concentrates weather impacts: the high country typically receives the heaviest snowfall, while the Front Range urban corridor can oscillate between rain, wet snow, and slush when temperatures hover near freezing. Mountain passes and the I-70 corridor are frequent chokepoints during winter storms, and holiday travel volumes can raise the stakes for timely road-weather messaging and traveler preparedness. State and federal agencies monitor these passages closely during systems like this one.
Main event
Snow developed across the high country early Saturday morning and gradually increased in coverage and intensity through the day. By late afternoon and into the evening hours, bands of heavier precipitation accompanied the advancing cold front, producing periods of moderate to heavy snowfall at higher elevations. Observers and road crews reported deteriorating visibility and accumulating snow on exposed stretches of major mountain routes during the Saturday evening commute.
The cold front moved through around 10:00 p.m. MST Saturday, driving snow levels downward. As temperatures fell overnight, snow reached lower elevations, allowing accumulation in foothill communities and across parts of the Denver metro. Forecasters highlighted the quick timing: a warm afternoon followed by a rapid drop overnight that limits the time for refreezing and affects surface conditions.
Storm-total forecasts call for 4–8 inches for much of the high country, with locally higher amounts up to 14 inches at some mountain-pass elevations in the northern mountains and on the highest peaks. Forecasts show up to 5 inches in the foothills and roughly 4 inches across the Denver metro area, though initial accumulation may be slushy where daytime warmth melted early snow.
Analysis & implications
Travel: The most immediate impact is on road safety. Mountain passes — especially along I-70 — are likely to see reduced speeds, slick surfaces, and possible chain or traction requirements. Holiday traffic can compound delays; agencies may stage plows and issue advisories, but localized whiteout conditions or accidents could still force temporary closures.
Urban impacts: In the Denver metro and lower-elevation communities, the combination of daytime warmth and overnight cooling tends to produce wet, heavy snow that can be slushy and slow to clear. That increases the short-term risk of compromised commuting conditions and localized flooding from meltwater in poorly drained areas before temperatures stabilize below freezing.
Hydrology and snowpack: For the high country, a 4–8 inch event with higher pocketed totals does little to change long-term water-supply projections by itself, but it contributes to near-term snowpack and runoff potential. The timing — mid-winter with cold air behind the front — favors storing water as snow rather than immediate runoff, except where melting occurs at lower elevations.
Forecast uncertainty and forecasting horizon: The primary uncertainties are the exact timing of heavier bands, elevation-dependent snow ratios (how fluffy or wet the snow will be), and localized wind-driven redistribution of snow at passes. These factors will determine which corridors face the greatest travel disruption and which foothill neighborhoods see measurable accumulations versus mainly melt and soak.
Comparison & data
| Region | Forecast accumulation |
|---|---|
| High country (general) | 4–8 in |
| Northern mountain passes / highest peaks | Up to 14 in (localized) |
| Foothills | Up to 5 in |
| Denver metro | About 4 in |
The table summarizes the forecasted accumulation ranges issued by regional forecast offices and consolidated by CBS Colorado on Dec. 25, 2025. Differences between higher-elevation totals and metro totals reflect rapid vertical temperature gradients typical of Colorado storms; the warm afternoon likely reduced early accumulation at low elevations, producing wetter snow and slushy conditions before colder air arrives and preserves accumulations.
Reactions & quotes
Travelers should expect changing conditions and allow extra time; mountain pass conditions can change quickly with this system.
Colorado Department of Transportation (advisory)
Snow levels will fall into the Plains Saturday night, enabling measurable accumulations down to urban corridors including Denver.
National Weather Service Denver/Boulder (forecast discussion)
Residents are advised to monitor evening commute conditions and follow official travel advisories; crews will be active on primary corridors.
CBS Colorado (report)
Unconfirmed
- Exact timing and location of the heaviest bands into the Denver metro remain subject to short-term shifts and are still being refined by forecast models.
- Specific road closure decisions for particular mountain passes beyond Saturday night are pending and will depend on evolving conditions and incident reports.
Bottom line
Colorado experienced a rapid transition from unusually warm conditions on Saturday, Dec. 25, 2025, to a strong, snow-producing cold front late that night. The high country will receive the largest storm totals (4–8 inches common, pockets to 14 inches), while foothills and the Denver metro can expect several inches of wet, slushy snow — around 4 inches for Denver — with the highest travel risk during the Saturday evening commute and overnight.
Residents and travelers should prepare for quick changes: check official forecasts, allow extra travel time, and expect plow operations and potential traction requirements on mountain routes. Monitor local NWS updates and state transportation advisories for the latest timing and corridor-specific guidance.
Sources
- CBS Colorado — regional news report and forecast summary (news)
- National Weather Service Denver/Boulder — forecast discussions and official warnings (federal forecast office)
- Colorado Department of Transportation (CDOT) — road condition advisories and travel guidance (state transportation agency)