Col de la Floria

Overview

The Col de la Floria is a full hors catégorie ascent, and the numbers leave no doubt about why. Over 28.5 km the road climbs from a valley floor at 603 m to a summit standing at 2424 m — a net elevation gain of 1821 m at an average gradient of 6.4%. That is a climb measured not in minutes but in the better part of an hour or more, sustained effort with almost no reprieve. The HC label sits at the top of the classification ladder, above categories 1 through 4, and Floria earns it through sheer duration as much as steepness. The total ascent of 1846 m — slightly more than the net gain of 1821 m — tells you the road isn't perfectly monotonic; there are small dips and rolls folded into the climb where 25 m of hard-won height is briefly given back and re-earned.

How the Gradient Unfolds

At 6.4% average over 28.5 km, the Floria is a climb of remarkable consistency rather than a wall. Do the arithmetic and it becomes vivid: every kilometre asks for roughly 64 m of vertical gain, hour after hour. The gap between total ascent (1846 m) and net gain (1821 m) is only 25 m, which means the descents baked into the profile are minor — this is very nearly all up. Expect the character to shift with altitude more than with pitch: the lower slopes near 603 m feel warmer and denser, while the air thins noticeably as you push past 2000 m toward the 2424 m summit. There is no headline max gradient on record here, which is itself telling — Floria's difficulty is a war of attrition, not a single savage ramp.

Pacing Notes

On a climb this long, discipline beats bravado. Your FTP is the number to respect: settle into a sustainable percentage of it and hold, because 28.5 km is far too long to ride above threshold. Going a few watts too hard in the first third will cost you dearly across the final 1821 m of accumulated gain. If you don't know your threshold, run your recent data through the FTP estimator before you commit to a target. Fuel early and often — an hour-plus of climbing at 6.4% burns through glycogen relentlessly, and the thin air near the 2424 m top makes recovery from any over-effort slow and unforgiving.

Gearing

Come prepared for a long grind. A compact 34-tooth inner chainring paired with a wide cassette is the sensible baseline: a 34×32 gives most riders a workable spin on the sustained 6.4% grades, while a 34×34 buys precious extra cadence for the higher, thinner-air kilometres above 2000 m where legs and lungs both protest. Given the 28.5 km length and 1821 m of climbing, err toward the easier ratio — a gear you never use costs nothing, but a gear you wish you had costs everything on the upper slopes.

Summary

The Col de la Floria is a definitive HC endurance climb: long, steady, and high. Respect the distance, pace to your threshold, and gear low, and its 2424 m summit is entirely attainable.

Length: 28.5 km
Average gradient: 6.4%
Max gradient: n/a
Start: 603 m
Summit: 2424 m
Net gain: 1821 m
Total ascent: 1846 m
Category: HC