Passo del Tomarlo

Overview

Passo del Tomarlo is a genuine mountain test: 11 km of climbing that lifts you from 680 m at the base to a summit of 1472 m. That is a net elevation gain of 792 m, delivered at an average gradient of 7.19% — a figure that rarely lets up over the full ascent. Officially rated category 1, it sits one rung below the hardest hors catégorie climbs, but there is nothing gentle about the numbers. With a maximum gradient of 13.81%, this is a climb that rewards patience early and punishes anyone who overcommits in the opening kilometres.

How the Gradient Unfolds

The defining feature of Tomarlo is its consistency. An average of 7.19% sustained across the whole 11 km means there are very few places to recover, and the total ascent of 765 m is packed into that unbroken effort. The gap between the 792 m net gain and the 765 m total ascent tells you the road climbs almost continuously, with little in the way of descending false flat to reset your legs.

Expect the steepest pitches to bite hardest where the road tilts toward its 13.81% maximum. These ramps sit well above the average, so they feel disproportionately savage after you have already been grinding uphill. The smart read of this profile is to treat the average as your baseline and brace for the harder sections rather than the other way around.

Pacing Notes

On a climb this steady, pacing is everything. The lack of flat recovery means your effort should be governed by sustainable power, not by chasing the wheel in front. A useful anchor is your FTP: aim to sit at or just below it for the bulk of the 11 km, spending your matches only on the ramps toward 13.81% where staying seated and controlled is hard.

If you do not know your threshold, work it out before you tackle Tomarlo using the FTP estimator. Knowing that single number transforms a climb like this from a guessing game into a manageable, measured effort — because when the gradient averages 7.19% for the entire ascent, going even slightly too deep early will cost you dearly near the 1472 m summit.

Gearing

With an average of 7.19% and spikes to 13.81%, gearing choice makes or breaks the day. For most riders, a compact 34-tooth chainring paired with a wide-range cassette is the sensible baseline. A 34×32 is workable if you are a strong, lighter climber comfortable turning a slightly bigger gear on the steep pitches. But given the sustained nature of the climb and that 13.81% maximum, most riders will be far happier with a 34×34, which gives you a spinnable escape gear for the ramps and protects your legs across the full 792 m of climbing. When in doubt, take the easier ratio — you cannot use gears you did not bring.

Summary

Passo del Tomarlo is a category 1 climb that earns its rating through relentless consistency rather than any single brutal wall, though the pitches to 13.81% will test everyone. Pace it by threshold, gear it generously, and respect the 11 km of unbroken effort to the top.

Length: 11 km
Average gradient: 7.19%
Max gradient: 13.81%
Start: 680 m
Summit: 1472 m
Net gain: 792 m
Total ascent: 765 m
Category: 1