Major mountain stage featuring this year’s Cima Coppi. The route winds its way up the Valle d’Aosta region before reaching its principal city, Aosta, where the lengthy ascent to the Great St Bernard (26 km at 5.0%) begins, at the end of which the peloton will cross the tunnel into Switzerland. The race is held on wide, well-paved roads for pretty much the entire stage. After the tunnel, the riders will hit the descent to Sembrancher (30 km), followed by a detour to Verbier to tackle the unprecedented Croix de Coeur (15 km at around 9%). This is followed by a demanding descent, featuring a very narrow first part, while the second section is wide and in excellent conditions, with six illuminated tunnels. The peloton will then ride through the Rhone Valley (the only completely flat section of the stage) to the foot of the final climb.
The closing climb (13 km at 7%) is steep in the first part, with several hairpins. The gradient eases out until the last kilometres, with a mild descent leading into the final stretch. The home straight is 300 m long, on 8 m wide tarmac, and uphill.