The Bastille Day showdown on the Bald Mountain will be cut short by six kilometres, with the stage now finishing at Chalet Reynard, because of winds of over 100kph forecast at the top.
A group of cyclists filmed the video above, showing some riders barely able to cling on to their bikes as they fought against the gales.
ITV's Matt Rendell also went near the top on Thursday morning and it sounds pretty blustery...
It's not uncommon for the mountain to be closed due to high winds, with a reported 240 days per year recording gusts of over 90kph.
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