19.7
PDI
6.6 mi
DISTANCE
2,852 ft
GAINED
7.9 %
AVG. GRADE
FULL CLIMB STATS
INTRO
PLAN YOUR ROUTE
We've partnered with Sherpa-Map.com to bring you the best route planning tool. With a PRO Membership you can use this climb as a reference when creating your route. Cotobello averages 7.9% over 10.6 km (6.6 mi), gaining 869 m (2,852 ft), and it never really lets up.
Km 0-1 (0-0.6 mi): 5.3% as the road leaves the valley floor.
Km 1-2 (0.6-1.2 mi): 11.0% - the first real wall, and the hardest kilometer of the climb.
Km 2-8 (1.2-5.0 mi): 7.6% - a steady grind through Castañeo and El Turnu.
Km 8-10.6 (5.0-6.6 mi): 8.4% to the esplanade at the top.
Km 1-2 (0.6-1.2 mi): 11.0% - the first real wall, and the hardest kilometer of the climb.
Km 2-8 (1.2-5.0 mi): 7.6% - a steady grind through Castañeo and El Turnu.
Km 8-10.6 (5.0-6.6 mi): 8.4% to the esplanade at the top.
The steepest 500 m averages 15.3%, the steepest kilometer (0.6 mi) 10.7%, the steepest 2 km (1.2 mi) 10.1%, the steepest 5 km (3.1 mi) 8.4% and the steepest 10 km (6.2 mi) 8.2%. The steepest quarter mile (0.4 km) averages 16.8%, and the single steepest 100 yards (91 m) hits 19.2%.
Roadway: The road is paved up to the esplanade near the summit, where the pavement ends and dirt tracks take over. It is a dead-end mountain road, so there is no through route to ride over the top. At 1,196 m (3,925 ft) in the Cantabrian Mountains, fog, rain and winter snow are all possible, so check the forecast before an early- or late-season ride.
Traffic: Very light. The road serves hamlets and cattle pasture rather than a destination, so expect the occasional local car, cows on the road and few other riders.
Parking: There are no marked cycling facilities at the start near Castandiello. Soto de Aller and Cabañaquinta, the municipal capital a short drive up the valley, are the practical places to leave a car; park considerately on the village streets.
Gear: A compact crank with a 32-tooth or larger rear cog makes the 11% second kilometer and the steady 8% above it manageable. Pack a rain jacket - Asturian weather changes quickly - and a warm layer for the descent.
Provisions: There are no services on the climb, and the bar at the top has closed. Fill your bottles before you start and carry food.
Before heading out on any cycling adventure check out our Things to Bring on a Cycling Trip and use our interactive check list to ensure you don't forget anything.
Aller is a former coal-mining valley turned outdoor-sports destination, and a rest day here has plenty to offer. Soto de Aller has a 12th-century tower that was restored in 2022 and is tied to the legend of Queen Doña Urraca, and the Xurbeo waterfall near Murias is considered one of the most beautiful in Asturias. The Foces de El Pino gorge makes a good hike, and in summer the council runs guided tours of the Pozo San Fernando mine in Uriés. The Fuentes de Invierno ski resort sits above the valley.
On the table, look for pote de berzas, casadielles pastries and the local panchón, a bread-dough dessert baked under embers. Aller sits just next to the legendary Asturian climbs of Lena and Quirós: Alto de Gamoniteiro East and Alto de l'Angliru are short drives away in neighboring valleys. See other climbs nearby, or build a custom route from here, with our Routes in the Area tool.
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