Passo della Castagnola

Rising to 578 m in Piedmont, Italy, Passo della Castagnola is a Category 3 cycling climb. From Voltaggio, the toughest side climbs 5.1 km at 4.6% average — 234 m of ascent, pitching to 10.8% at its steepest. The steepest kilometre averages 9.4%, around km 1.9. It can also be climbed from Ronco Scrivia (5.1 km at 4.4%): 2 measured approaches in all, each profiled kilometre-by-kilometre against Copernicus GLO-30 elevation data. On the Fiets scale it rates 1.1. Spring to autumn brings the steadiest riding, with snow possible in mid-winter.