Mullan Pass cycling climb profile
Mullan Pass is a long, controlled category 3 climb in the US: 17.5 km from bottom to summit, rising from 1263 m to 1801 m. The headline number is the 3.08% average gradient, which tells you most of what matters tactically. This is not a climb defined by repeated steep walls. It is a sustained uphill drag where the main challenge is resisting the temptation to ride it like rolling terrain just because the gradient looks manageable early on.
Across the full climb, the net elevation gain is 538 m, with total ascent listed at 537 m. In practical riding terms, that puts Mullan Pass in the category of climbs where pacing discipline matters more than explosive power. The road gains height consistently enough that a rider who keeps lifting above threshold on every steeper pitch will pay for it before the summit.
How the gradient rides
The average gradient of 3.08% suggests a climb that often rewards seated, aerobic pressure rather than low-cadence grinding. However, the maximum gradient of 7.96% is the key warning. Even on a climb with a moderate average, pitches close to 8% are enough to break rhythm, especially if they arrive after fatigue has accumulated.
Without detailed split-by-split gradient data, the safest way to read Mullan Pass is as a mostly moderate climb with sharper sections embedded inside it. That combination can be deceptively hard: the easier sections invite speed, while the steepest ramps ask for torque. If you over-ride the shallower grades, the 7.96% sections will feel disproportionately expensive.
The climb rises 538 m over 17.5 km, so the overall demand is duration plus elevation gain rather than brute steepness. Think of it as a power-management climb. The fastest sustainable ride will usually come from keeping the effort smooth across gradient changes, not from attacking every visible rise.
Pacing and gearing notes
Start below the effort you think you can hold. On a climb averaging 3.08%, it is easy to sit a little too high in power because speed remains relatively good. That is the trap. Use the first part of the climb to find a controlled rhythm, then let the effort build only if the legs are still responding.
A compact or endurance-friendly climbing gear is still useful, not because the whole climb is steep, but because the maximum gradient reaches 7.96%. Having one easier gear than you expect to need lets you keep cadence stable when the road bites. That matters if you are riding near /glossary/ftp or trying to preserve the legs for later terrain.
Practical approach:
- Ride the average gradient, but respect the maximum gradient.
- Keep pressure steady on the shallow sections instead of surging.
- Shift early when the road steepens so cadence does not collapse.
- Treat the final outcome as a pacing test across 17.5 km, not a short punchy effort.
For riders using power, Mullan Pass is well suited to a controlled aerobic climb with brief allowances for the steepest ramps. For riders going by feel, the right intensity is one that feels almost too easy early, sustainable through the middle, and only truly demanding as the summit approaches.