The legendary climb was originally left out by order of the government of the Savoie region in France, where the summit is based.
However, it has now been partially reinstated. The potentially decisive stage will now finish at the monument to Italian cycling legend Marco Pantani 4.25km from the top.
The start has been pushed back 30 minutes to 13:00 CET (12:00 UK time), and a race organisers' statement said: "Considering the ever-changing weather conditions, should the weather deteriorate during the night, the Direction of the Giro reserves the right to make further modifications in order to protect the riders’ and caravan’s safety."
The stage was meant to be a 149km route from Cesana Torinese to the Col du Galibier and was set to be one of the race's most punishing stages. The inclusion of the revered and feared Galibier was a nod to the Tour de France, which this year celebrates its 100th edition.
The 14th stage of the Giro on Saturday was also altered due to snow on the climb to Sestriere. A new route added 12km to create a 180km stage that finished with the scheduled summit finish of Jafferau.