Valles Pass

Overview

Valles Pass is a short but genuinely demanding category 2 climb that packs a lot of vertical into very little road. Over just 5.9 km you gain 471 m of net elevation, starting at 1566 m and topping out at 2037 m. The headline figure is the average gradient of 7.98%, a number that never lets you settle, and the profile bites hardest with a maximum pitch of 18.78%. With a total ascent of 632 m across the effort, this is a climb that rewards discipline far more than enthusiasm.

How the Gradient Unfolds

The defining feature of Valles Pass is consistency with a sting. An average of 7.98% over 5.9 km means there are almost no genuine recovery stretches — this is not a climb where you coast between efforts. The gap between the 7.98% average and the 18.78% maximum tells the real story: somewhere on this ascent the road kicks up to more than double its average pitch, and that single ramp can wreck a ride that was going well.

Note too that the total ascent of 632 m exceeds the net gain of 471 m by 161 m. That difference means the road isn't a clean one-way climb — there are dips or false flats where you give back altitude before clawing it straight back. Every one of those recovered metres has to be re-climbed, which is why the effort feels harder than the net 471 m suggests. Above 2000 m the summit at 2037 m adds thinning air to already-tired legs.

Pacing Notes

The smart approach is to ride the first two-thirds well within yourself. On a climb averaging 7.98%, going into the red early is a one-way ticket to blowing up before the steepest ramp. Anchor your effort to your FTP and aim to sit just below it on the sustained sections, holding a small reserve for the 18.78% pitch where you'll have no choice but to surge.

If you don't know your threshold, run the numbers through the FTP estimator before you tackle Valles Pass — pacing a climb this steep by feel alone almost always ends badly. Keep something in the tank for the final push to 2037 m, where the altitude quietly steals watts you'd normally have.

Gearing

Do not under-gear this climb. With a sustained 7.98% average and that 18.78% maximum, most riders will want a compact chainring paired with a wide-range cassette. A 34×32 is the sensible baseline and will get many riders up the steady sections at a workable cadence — but on the steepest ramp, a 34×32 can leave you grinding at a low, knee-straining cadence.

For that reason, if your legs or your terrain tend toward the conservative, a 34×34 is the safer choice. That extra sprocket buys you the cadence headroom to spin over the 18.78% pitch rather than muscle it, keeping your effort aerobic when the gradient tries to force you anaerobic. Better to carry a gear you don't fully use than to stall on the wall.

Summary

Valles Pass is a compact climb that punches well above its 5.9 km length. Respect the average, fear the maximum, gear generously, and pace the first half with patience — do that and the 2037 m summit is yours.

Length: 5.9 km
Average gradient: 7.98%
Max gradient: 18.78%
Start: 1566 m
Summit: 2037 m
Net gain: 471 m
Total ascent: 632 m
Category: 2