Aspen Snowmass Snowfall Data & Powder Probability

Snowfall patterns over the last decade

Across ERA5 reanalysis snowfall records from 2015 to 2025, Aspen averages 302cm (119 inches) of snowfall a year, with the November-through-April ski season delivering about 248cm of that total. March is the heaviest calendar month in the 10-year average at 48.8cm, narrowly ahead of February at 45.0cm and December at 43.8cm; April (38.1cm), January (37.1cm) and November (34.8cm) fill out the season. Ranked by powder probability — the share of weeks with at least 15cm of fresh snow — February leads at 25%, March at 24%, December at 22%, April at 20%, January at 16% and November at 15%, so mid-February through late March is the window with both the deepest totals and the highest powder-day odds in the record.

Year-to-year variability is moderate but with a notably high floor. January snowfall in the 10-year record ranges from 19.9cm in the driest winter to 67.1cm in the wettest — a roughly 3.4x spread, but every January in the decade still cleared 19cm. February sits in a narrower band between 28.6cm and 50.5cm, while March is the most volatile heavy month, swinging from 18.3cm to 81.2cm. December ranges from 23.6cm to 81.4cm. The relatively tight February range is unusual among western US resorts tracked here, and it is why mid-February has historically been Aspen's most reliable powder week: a strong year delivers nearly twice the snow of a quiet one, but neither extreme falls below skiable totals.

In the context of other Colorado resorts tracked here, Aspen's 302cm annual average sits in the middle of the Rocky Mountain cluster: Steamboat averages 302cm, Breckenridge 300cm, Crested Butte 314cm, Winter Park 327cm, and Vail 333cm — all within roughly 10% of one another. What distinguishes Aspen in the record is the absence of a single dominant peak: where Mammoth concentrates snow in March (147.0cm) and Park City in March (51.1cm) and January (49.0cm), Aspen spreads its heaviest totals evenly across December, February and March. The signature is consistency rather than volume: the late-February through mid-March window has historically combined the deepest totals with the best powder probability, but January and December are within a few centimetres of those peaks, so trip timing is less sensitive at Aspen than at resorts further west.

Snow & Weather Conditions

We use 10 years of historical data to help you plan — not a live snow report.

Colorado is famous for light, dry "champagne powder" produced by its continental climate and high altitude. Over 300 days of sunshine a year mean that fresh snow is often followed by bluebird skies — ideal conditions for powder skiing. The rarefied atmosphere at this elevation keeps ambient temperatures far below the freezing mark for months on end, ensuring a stable base that just keeps growing. Even modest weather disturbances tend to deposit surprisingly fine, low-moisture crystals. Cumulative seasonal totals routinely top 8-12 metres, packing down into a base layer 3-4 metres deep by mid-winter.

Best Time to Ski

The best time to ski at Aspen Snowmass is February and March, with 45cm average snowfall and 25% powder probability. Based on 10 years of historical snowfall data from PowderDays. The ski season typically runs from mid-November through mid-April, with March often delivering the deepest snowpack. Browse PowderDays' decade-spanning snow statistics to pinpoint the weeks with the heaviest accumulations.

Powder Probability by Month

Chance of 15cm+ fresh snow in any given week (10 years of data):

• Nov15%
• Dec22%
• Jan16%
• Feb25%
• Mar24%
• Apr20%

10-Year Snow History

What Makes It Special

Expect wide-open above-treeline bowls, steep chutes, perfectly groomed cruisers, and expansive terrain parks. The Colorado ski scene blends laid-back mountain-town charm with world-class dining, craft breweries, and a vibrant après-ski culture.