Bernal was elevated to be co-leader of the team with defending champion Thomas for the Tour de France, because of the absence through injury of Froome. After the stage 2 team time trial he had a top ten position in the general classification, which he retained, despite an unimpressive individual time trial performance, into the three decisive alpine stages. An attack on the last climb of stage 18 saw him move into second place overall, ahead of Thomas, and he took the yellow jersey as race leader on stage 19 after an attack on the Col de l'Iseran. The stage was shortened because of landslides and a severe hail storm with 38 km remaining. Although the stage positions were considered null, times were taken at the top of the Iseran, putting Bernal in the lead with margins of forty five seconds over previous leader Julian Alaphilippe and one minute and eleven seconds over Thomas. He defended his lead on stage 20, another mountain stage, and confirmed his victory with the largely ceremonial ride onto the Champs-Élysées in Paris.