Puerto de las Estacas

Overview

Puerto de las Estacas is a Category 1 climb in Spain, running 10.3 km from a valley floor at 350 m to a summit at 1026 m. On paper it delivers a net elevation gain of 676 m at an average gradient of 6.54%, which places it firmly in the sustained-effort tier: long enough to matter, steep enough on average that you cannot muscle through it. The start and summit numbers frame a climb that gains altitude steadily on balance, but the balance sheet is where things get interesting.

The gap between the 676 m net gain and the 1259 m of total ascent is the story here. That is 583 m of extra climbing folded into the profile — sections where the road drops and forces you to regain height you already earned. Nearly half of your vertical work does not show up in the net figure. In practice that means more accumulated fatigue than the average suggests, and it means the descents inside the climb are not free rest: they interrupt rhythm and demand re-acceleration each time the road tips back up.

How the Gradient Unfolds

An average of 6.54% is a fiction stitched together from very different sections. With 583 m of hidden ascent, the profile clearly rolls: short rises separated by dips and flatter breathers, rather than one clean uphill drag. The steep pitches live where the road recovers lost height quickly, so the punchy ramps land right after the descents — exactly when your legs are least warmed into a rhythm.

• Flatter and recovery sections where the road eases or drops, offering brief respite but breaking cadence
• Repeated short climbs that each regain altitude given up on the preceding dip
• The steepest ramps concentrated on the sharp re-ascents, well above the 6.54% average

Pacing Notes

On a climb this undulating, chasing even speed is a trap: holding a fixed pace over the steep re-ascents spikes your power far past what you can hold for 10.3 km. Ride to even effort instead. Anchor your climb to your sustainable power output and let speed vary — faster on the dips, slower on the ramps. Bank nothing on the early kilometres, because the 583 m of hidden regaining is what breaks riders late. If you do not know your ceiling, set it with the FTP estimator before you go, then hold a touch under it through the rolling middle.

Gearing

Because the steepest ramps sit well above the average and arrive when your legs are cold off a descent, gear for the ramps, not the mean. Run a compact or sub-compact chainset paired with a wide-range cassette — a 34×32 or 34×34 low gear keeps your cadence up on the sharp re-ascents so you spin rather than grind and stall. Confirm your setup before the ride: check the cassette range and that the derailleur handles it cleanly. Being under-geared here means grinding the ramps at low cadence, and over 10.3 km that empties the tank early.

Summary

• Length: 10.3 km
• Average gradient: 6.54%
• Net elevation gain: 676 m
• Total ascent: 1259 m
• Category: 1

Puerto de las Estacas rewards riders who respect the undulation. The net 676 m understates the work; the 1259 m of total ascent is what your legs actually pay. Pace to effort, gear for the ramps, and treat every dip as a cost to be repaid rather than a rest.