Karkonosze Pass

Overview

Karkonosze Pass is a Category 1 climb that asks for genuine respect. Over 17.1 km it lifts you from 346 m at the base to 1287 m at the summit, a net gain of 941 m. The recorded total ascent is 929 m, so barring a handful of metres of relief the road tilts upward almost the whole way. The average gradient of 5.52% sounds moderate on paper, but a climb this long rarely rides at its average — the steady drip of vertical metres is what defines the day, not any single ramp.

How the Gradient Unfolds

Think of this as a sustained effort punctuated by sharper bites. With a 5.52% average stretched across 17.1 km, long passages will sit close to that figure while others push well beyond it. The maximum pitch touches 14.7%, more than double the average, so the climb is not uniform — it breathes. Expect the shallower kilometres to lull you into a rhythm before the road stiffens. Because total ascent (929 m) nearly matches net gain (941 m), there are essentially no recovery descents to reset your legs; every metre climbed stays climbed. The 941 m of elevation between start and summit is delivered in one long arc rather than in stacked, separate walls.

Pacing Notes

The cardinal rule on a 17.1 km climb is to start below your ceiling. Anchor your effort to your FTP: riding the shallower early gradients a touch under threshold banks the reserves you will spend when the road rears toward 14.7%. Because the average is 5.52%, a consistent power target will translate into a fairly steady speed on the constant sections and a natural slowdown on the steep ones — let it happen rather than fighting to hold pace. If you do not know your threshold number, run it through the FTP estimator before your attempt so your pacing has a real anchor. The climb rewards patience: 941 m of climbing punishes anyone who spikes early and blows before the summit at 1287 m.

Gearing

For a Category 1 climb of this length with pitches to 14.7%, gear for the steep moments, not the average. A compact 34-tooth inner chainring paired with a wide-range cassette is the sensible baseline. A 34×32 will get most trained riders up the sustained 5.52% sections comfortably, but when the gradient hits 14.7% you will want more relief — a 34×34 gives you an extra escape gear to spin rather than grind, which protects your legs across a full 17.1 km. If in doubt, choose the easier ratio; a spare gear you never use costs nothing, while running out of gears at 941 m of accumulated fatigue costs everything.

Summary

Karkonosze Pass is a long, honest Category 1 test: 17.1 km of near-continuous climbing at 5.52%, with a 14.7% maximum to keep you honest and 941 m separating base from summit. Pace conservatively, gear generously, and let the average do the work.

Length 17.1 km
Average gradient 5.52%
Max gradient 14.7%
Start 346 m
Summit 1287 m
Net gain 941 m
Total ascent 929 m
Category 1