Col du Granon, at an elevation of 2.413m (7,916ft) above the sea level, is a high mountain pass in the Alps in the department of Hautes-Alpes in France. Col du Granon hosted for 25 years the highest ever mountain-top stage finish in the Tour de France - once only - in 1986. Eduardo Chozas of Spain won the stage after a long lone breakaway. The pass is traversed by D234T road.
A narrow tarmac road winds steeply up the southern approach. A gravel road continues beyond the pass, in a military training zone. The Maginot-Fortress Col du Granon was a component of the Secteur Fortifié de Dauphine. The garrison consisted of men of the 82th BAF. It saw little action in 1940, during the Italian invasion of France. Despite being a pass, there's only one side paved. The other side of the pass is a dirt track. In both sides, the climb is simply terrible, with a notorius lack of oxygen that tests the organisms and a high degree of steepness. The slopes are also very regular, oscillating between 8 and 10.5 % average gradient.
There are 3 routes to reach the summit of this pass. From Val des Prés, the ascent is 15.33 km long. Over this distance the elevation gain is 1.009 meters. The average percentage is 6.6 %. From Briançon, the ascent is 16.77 km long. Over this distance the elevation gain is 1.200 meters. The average percentage is 7.2 %. And from Saint Chaffrey, the ascent is 11.5 km long. Over this distance the elevation gain is 1.053 meters. The average percentage is 9.2 %.