Col de la Couillole is a high mountain pass at an elevation of 1.678m (5,495ft) above the sea level, located within the Mercantour National Park, in the Alpes-Maritimes, in the extreme southeast corner of France. The pass is traversed by the scenic Route des Grandes Alpes.
The road to reach the pass is called D30. Be aware that D30 changes to M30 after the Col towards Saint Sauveur sur Tinee. It’s asphalted. Starting from St. Sauveur-sur-Tinée, at 504m, above the sea level, the climb is 15.7 km long, with an elevation gain of 1,174 meters. The average gradient is 7.5 %. This climb is just an example of regularity. With nearly no section coming below 6 %, and with several kilometers above 8 % with peaks at 11 %, this climb just goes up and up until the top is reached. The pass has been climbed by the Tour de France bicycle race. Very steep and curvy, narrow at points with a few hairpins and picturesque tunnels. It is very scenic and pleasant to ride.