Passo di Fonte Dragurina

Overview

Passo di Fonte Dragurina is a genuine hors catégorie monster: 34.7 km of continuous climbing that lifts you from just 27 m at the base to a 1904 m summit. That is 1877 m of net elevation gain, with a total ascent of 1860 m once the small rolling dips are accounted for. The average gradient reads a deceptively civil 5.41%, but the length is what defines this climb — you will spend well over an hour and often far longer with the road tilted against you. The 13.98% maximum tells you the average hides some serious teeth.

How the Gradient Unfolds

The math is worth sitting with. A 5.41% average over 34.7 km is a steady, grinding effort rather than a wall, but averages lie on climbs this long. With a peak of 13.98% — more than double the mean — the profile clearly stacks its difficulty into short, sharp ramps separated by shallower recovery drags. Expect the lower slopes near 27 m to ease you in, then progressively steeper terrain as you push toward the 1904 m summit. The gap between the 1877 m net gain and the 1860 m total ascent is small, which tells you there is very little downhill respite: nearly every metre you climb, you keep. Treat any pitch approaching that 13.98% figure as a deliberate surge, not a place to blow up.

Pacing Notes

On a climb of this duration, discipline beats bravado. Anchor your effort to FTP and hold a sustainable percentage of it for the long middle section, saving matches for the steep ramps toward 13.98%. If you do not know your threshold, run the numbers through the FTP estimator before you commit to a target. Because you are climbing for the full 34.7 km, going even slightly too hard in the first third will cost you dearly across the remaining distance to 1904 m. Fuel early and often — an effort spanning this much net gain (1877 m) will empty your tank if you wait until you feel hungry.

Gearing

For an HC climb averaging 5.41% with ramps to 13.98%, gear low and gear generously. A compact 34-tooth chainring is the sensible front end. Pair it with at least a 34×32 for the sustained grind, and if you have the range, a 34×34 will make the steepest 13.98% pitches survivable while keeping your cadence spinning rather than grinding. Over 34.7 km, a spare sprocket or two at the bottom is never wasted — protecting your knees across 1877 m of gain matters more than looking pro.

Summary

Passo di Fonte Dragurina earns its HC rating through sheer scale: 34.7 km, 1877 m of net gain, and a summit at 1904 m reached from near sea level. Pace it to your threshold, fuel relentlessly, and carry gearing built for the 13.98% ramps.

Length: 34.7 km
Average gradient: 5.41%
Max gradient: 13.98%
Start: 27 m
Summit: 1904 m
Net gain: 1877 m
Total ascent: 1860 m
Category: HC