San Jorio Pass

Overview

San Jorio Pass is a hors catégorie (HC) climb that earns its rating on raw numbers alone. Over 19.7 km it averages a punishing 9.07%, dragging you from a valley floor at 222 m all the way to a summit of 2008 m. That is 1786 m of net elevation gain, with 1740 m of total ascent packed into the effort — meaning the road climbs almost relentlessly, offering barely any respite or descent along the way.

For context, an HC climb sits above category 1, 2, 3, and 4 on the difficulty scale: it is the hardest label a road can carry. San Jorio Pass belongs there without argument. A near-9% average sustained for close to twenty kilometres is the kind of effort that rewards patience and punishes the overeager.

How the Gradient Unfolds

The defining feature here is consistency at a savage level. A 9.07% average over 19.7 km leaves very little flat ground to recover on, so the climb behaves less like a series of ramps and more like one long, grinding wall. With 1740 m of total ascent against 1786 m of net gain, the road almost never gives elevation back — you are climbing nearly the entire way.

The sting comes from the pitches. The gradient maxes out at 22.76%, more than double the average, so even a well-judged rhythm will be broken repeatedly by steep sections that force you out of the saddle or deep into your lowest gear. Treat every ramp as a spike above an already-brutal baseline rather than an isolated event.

Pacing Notes

On a climb this long and steep, pacing is everything. Anchor your effort to your FTP and resist the temptation to chase the early gradient. If you do not know your threshold, run the numbers through the FTP estimator before you commit to a target.

The math is unforgiving: 1786 m of climbing at 9.07% means you will spend a long time above tempo. Aim to hold a steady percentage of threshold on the 9% baseline and give yourself a little headroom, because the 22.76% ramps will briefly push you well over your target no matter how disciplined you are. Bank nothing early — the summit at 2008 m is a long way up.

Gearing

Gear for survival, not pride. With a 9.07% average and pitches of 22.76%, most riders will want the widest range they can fit. A compact chainring paired with a broad cassette is the sensible baseline: 34×32 is the minimum many climbers should consider here, and 34×34 gives you the extra margin that makes the steepest ramps rideable rather than a walk. If your setup allows an even easier ratio, take it — over 19.7 km you will be grateful for every extra tooth.

Summary

San Jorio Pass is a relentless HC ascent: nearly twenty kilometres at close to 9%, climbing almost 1800 m with ramps that touch 22.76%. Pace it off your FTP, gear low, and respect the distance to the summit.

Length: 19.7 km
Average gradient: 9.07%
Max gradient: 22.76%
Start: 222 m
Summit: 2008 m
Net gain: 1786 m
Total ascent: 1740 m
Category: HC