Col de la Croix Saint-Robert

Col de la Croix Saint-Robert Cycling Climb

The Col de la Croix Saint-Robert is a Category 2 climb in France that earns its rating through a combination of sustained length and a gradient profile that hides genuine aggression behind a moderate average. At 9.1 km with 738 m of total ascent and a 6.25% mean gradient, it sits comfortably in the range that punishes poor pacing more than raw power deficits.

The Numbers at a Glance

• Length: 9.1 km
• Average gradient: 6.25%
• Maximum gradient: 21.86%
• Total ascent: 738 m
• Net elevation gain: 567 m
• Category: 2

How the Climb Rides

The gap between the 567 m net elevation gain and the 738 m total ascent tells you something important: this road does not climb in a straight line. There are sections where gradient eases and briefly recovers, which can tempt riders into surging when they should be banking energy.

The 21.86% maximum gradient is the defining feature of the climb's character. A ramp that steep on a road averaging 6.25% means the severe pitches are localised — probably one or two walls rather than a prolonged grind at that intensity. That distinction matters for how you approach the lower and middle sections. If you burn matches early treating the moderate gradients like a threshold effort, you will be in genuine difficulty when the road kicks past 15%.

The start elevation of 880 m means altitude is not yet a serious physiological factor on the lower slopes, though by the summit the thinner air at 1,447 m will be noticeable for riders not accustomed to it, particularly when hitting the steeper ramps near the top.

Pacing Strategy

The core principle here is restraint in the first half. A 6.25% average over 9.1 km is a long enough effort that riding above your functional threshold power for the opening kilometres will cost you disproportionately when the gradient spikes.

Recommended approach:

• Bottom third: Treat this as a warm-up phase. Keep power at or just below threshold. If the road feels easy, that is correct — you are saving for the steep sections.
• Middle third: Increase effort gradually as legs are properly activated. Watch for gradient changes; use any easier ramp to recover slightly rather than accelerate.
• Upper third / maximum gradient sections: This is where the 21.86% walls appear. On pitches this steep, even strong climbers need a very low gear. Seated climbing preserves energy; out of the saddle is fine for short bursts but unsustainable across a full 20%+ ramp.
• Final approach to summit: Hold steady. The tendency after surviving a brutal ramp is to ease off completely — resist it. Controlled power to the top.

Gearing Notes

For the 21.86% sections, a compact chainset (50/34 or smaller) is strongly advisable unless your FTP relative to body weight is exceptional. A rear cassette offering at least a 32-tooth sprocket is sensible for most riders. On a road that averages 6.25% but touches nearly 22%, being slightly over-geared on the moderate sections is a far better problem than being under-geared when the road walls up.

If you want to estimate what power output you should target across the full 9.1 km, the FTP estimator can help you set a realistic ceiling before you begin.

Bottom Line

The Col de la Croix Saint-Robert rewards disciplined riders who respect the gap between its average gradient and its maximum. Treat the 6.25% mean as context, not a target — the 21.86% ramp is the climb's true test, and how fresh you are when you reach it will define your experience of the upper mountain.