The Passo dello Zoncolan, in Friuli’s Carnic Alps, has built a reputation as the Giro d’Italia’s most merciless climb. From Ovaro, its hardest face leaves no let-up over barely 10 km.
A gradient that pushes the limits
From Ovaro, the road climbs just 10.1 km but for 1,210 m of elevation gain, at a dizzying 11.9% average that locally reaches 22% on the steepest sections. Few road climbs anywhere in the world pack this much difficulty into such a short distance, earning the Zoncolan a place among the professional peloton’s most feared ascents.
The road, narrow and winding through forest for most of the way, opens onto clear alpine pastures in the final kilometres, with views stretching across the whole of the Carnic Alps.
Getting the ride right
A very wide-range cassette (11-34 or more) is nearly essential: the gradient never drops below 10% for long stretches, making any standard gearing insufficient. Best to start well below the pace you think you can hold — pacing mistakes are punished harshly on a profile like this.
When to go
June to September, as the road stays rideable without risk of snow over this period in the Carnic Alps. July-August offers the best conditions but also the heaviest crowds of cyclists coming to test themselves against the climb’s legend.
Good to know
Ovaro and Sutrio, small towns in rural Friuli, offer limited but sufficient accommodation for a stopover, with convenient access to Tolmezzo, Carnia’s main town, to extend a visit to this still lightly touristed alpine range.