Santa Helena

Overview

Santa Helena is a long, high-altitude Category 1 climb that trades brute steepness for sheer distance and thin air. Over 28.9 km it averages 4.26%, a figure that sounds forgiving until you factor in where it happens: the road begins at 1978 m and tops out at 3206 m, a net gain of 1228 m. That places the entire effort in the altitude band where oxygen is noticeably scarcer, and it turns an otherwise moderate gradient into a genuine test of endurance. The total ascent of 1386 m confirms the profile isn't a clean ramp — there is 158 m of climbing beyond the net gain, meaning the road gives back a little before demanding it again.

How the Gradient Unfolds

Do not let the 4.26% average lull you. A climb this long almost never holds a steady slope, and the numbers prove it: with a maximum gradient of 18.67%, there is at least one section more than four times steeper than the average. The gap between the 1386 m total ascent and the 1228 m net gain tells you the road undulates — roughly 158 m of the climbing is "extra," repaid on short descents or flatter shelves that break the rhythm. Expect the climb to alternate between draggy, big-ring stretches and sharp kicks that force you out of the saddle. The 18.67% wall is where your day is decided; everything else is about arriving at that ramp with something left.

Pacing Notes

On a climb of 28.9 km, pacing is everything. Ride the first two-thirds well under your limit, targeting a wattage you could hold for well over an hour — comfortably below your FTP, because altitude will quietly shave your ceiling as you approach 3206 m. If you don't know your threshold, run the numbers through the FTP estimator before you plan your effort. Save headroom for the 18.67% pitch: attack it seated and steady rather than heroically, and treat the undulations as recovery, not as places to press. The climb rewards patience — the last kilometers near the summit are where thin air punishes anyone who spent too early.

Gearing

At 28.9 km with a max of 18.67%, gear for survival on the steep ramps, not for the 4.26% average. A compact 34-tooth chainring paired with a wide-range cassette is the sensible baseline. A 34×32 will get most fit riders up the climb, but on a pitch nearing 18.67% — and especially with tired legs above 3000 m — you'll be grinding at a low, grinding cadence. If you have any doubt about your climbing legs or the altitude, fit a 34×34 (or wider) to keep your cadence spinning and your knees intact. Given the length and elevation, err toward the easier ratio; you'll rarely regret spare gears on a Category 1 monster.

Summary

Santa Helena is a distance-and-altitude climb: 28.9 km of mostly moderate gradient punctuated by a savage 18.67% wall, all played out between 1978 m and 3206 m. Pace it conservatively, gear it generously, and respect the thin air near the top.

Length: 28.9 km
Average gradient: 4.26%
Max gradient: 18.67%
Start: 1978 m
Summit: 3206 m
Net gain: 1228 m
Total ascent: 1386 m
Category: 1