Mount Evans Road
Hors Catégorie43.2 km
Distance
2707 m
Elevation Gain
6.3%
Average Gradient
11%
Max Gradient
The highest paved road in North America and the most demanding cycling ascent in the continental United States. Beginning in Idaho Springs at 2,337m, the Mount Evans Road climbs 2,707m to the 4,346m summit — a vertical gain that exceeds any single climb in the Alps or Pyrenees. The gradient is a deceptively moderate 6.3% average, but at altitude above 3,500m the thin air transforms every kilometre into a physiological challenge unlike anything at sea level. The climb passes through four distinct ecological zones: montane forest, subalpine forest, krummholz (wind-tortured timber near treeline), and alpine tundra above 3,700m. Above Echo Lake at 3,246m, the road enters Rocky Mountain National Park terrain and the exposure becomes extreme — no guardrails, fierce winds, and temperature swings of 20°C across a single day. The summit at 4,346m is frequently shrouded in cloud; on clear days the view extends 200 miles across Colorado. This is a full-day undertaking from Idaho Springs, requiring a very early start, multiple layers, and meticulous nutrition planning.
Pro Tip
The road closes with the first major snowfall (usually mid-October) and reopens in late May or early June — check the Colorado Department of Transportation website for the exact opening date each year. Carry a long-sleeve jersey, arm warmers, and a waterproof regardless of the forecast: the summit temperature is typically 15-20°C below the base, and afternoon storms are violent above 4,000m. Idaho Springs has excellent coffee shops for pre-ride fuelling. Descend slowly: the road is narrow, two-way traffic above Echo Lake, and altitude impairs judgement.