Muir Pass

Muir Pass cycling climb profile

Muir Pass is not defined by a savage average gradient. It is defined by duration. At 69.4 km, with 2564 m of net elevation gain and 2597 m of total ascent, this is an HC climb that asks whether you can keep producing controlled power for a very long time without getting pulled above your ceiling too often.

The headline average of 3.7% can make the climb look more manageable than it will feel in practice. Over this distance, even a moderate gradient becomes costly because there is so little overall reset in the profile. The total ascent is only 33 m more than the net gain, which tells you the route trends upward with very limited descending relative to the overall rise. This is not a climb where repeated downhill sections are likely to repay early mistakes.

How the gradient unfolds

Starting at 317 m and topping out at 2881 m, Muir Pass climbs through a large vertical range. The available profile data points to a long, steady accumulation of elevation rather than a short, explosive ascent. The maximum gradient of 8.55% matters because it shows there are steeper ramps, but the 3.7% average says those ramps are embedded inside a much longer aerobic grind rather than defining the whole climb.

That combination shapes the ride. The easier gradients will tempt you to ride fast, especially early, because the road may not feel steep enough to demand caution. But the summit is far away, and the climb keeps asking for work. The real danger is not one isolated steep pitch. It is letting the shallow sections drift above sustainable power, then reaching the 8.55% ramps without enough margin to absorb them.

Pacing and gearing

Treat Muir Pass as a durability test. The correct pacing strategy is conservative early, steady through the middle, and only more assertive once the remaining climb is genuinely manageable. Riding by /glossary/ftp or another known endurance benchmark is useful here because perceived effort can understate the cost of a long 3.7% climb, especially when speed feels relatively high.

Practical approach:

• Start below your target climbing effort and let the climb come to you.
• Use the shallow sections to keep pressure smooth, not to chase speed.
• Save a gear for the 8.55% maximum gradient so cadence does not collapse on the steepest ramps.
• Fuel as if the length is the main opponent, because on a 69.4 km climb it is.

For gearing, the key is range, not bravado. You want a low gear that lets you stay seated and controlled when the gradient kicks up, but also enough intermediate steps to avoid surging on the long moderate sections. Muir Pass rewards riders who keep the effort boring for a long time. If it feels too easy early, that is probably the right place to be.