Before the race start, this year's course was originally rerouted near its finish line, between Les Houches, France, and Chamonix, because of landslides on the trail along the Arve River, and then just prior to the race start, the race organization rerouted off an exposed section between La Gittaz and Beaufort, France, 73 kilometers into the race, because of anticipated storms. The new route didn't lose much distance but lowered the total elevation gain and made final race times significantly faster.