Colle San Carlo from Morgex: 10 km of Relentless Climbing Towards 2,000 Metres
From the centre of Morgex to Colle San Carlo, there are just 10 km but almost 1,000 metres of elevation gain. A steady climb through forests and hairpin bends that can be included in a scenic loop via La Thuile and Pré-Saint-Didier.
Looking at the numbers, Colle San Carlo from Morgex seems tough. It's mainly because of its steep sections. Over ten kilometers, several parts exceed 13%, and some hit 16%.
But once you're riding, you realize the real challenge is different. The road climbs steeply almost all the time, with few breaks. It's not just the steep bits; it's the ten kilometers near 10% that really wear you out.
The climb starts just above Morgex, following signs for Colle San Carlo and Lago d'Arpy. From there, the road gains about a thousand meters in just ten kilometers, with an average slope near 10%.
I tackled this climb in June on a gravel bike, on a perfect day with pleasant temperatures even at midday. The asphalt was generally in good condition, suitable for both road and gravel bikes. I did encounter a few cars, more than expected for a mountain road, but nothing that ruined the ride's peace.
A climb remembered for its consistency
After the last houses of Morgex, the road quickly enters the forest. Trees line most of the ascent, making it pleasant even on hot days. Open views are rare and appear mainly where the vegetation thins. But the real star here isn't the scenery. It's the climb itself.
Many alpine passes mix steep ramps with easier stretches. On Colle San Carlo, this rarely happens. Kilometer after kilometer, the road keeps climbing at similar gradients, forcing you to maintain constant effort. After a few kilometers, you realize the real challenge isn't the steepest part but its consistency.
As you climb higher, houses become scarce, and you feel more immersed in the mountains. The road seems to have one goal: keep gaining meters until the pass.
Reaching the 1,951 meters of Colle San Carlo feels like earning every meter of elevation. It's not a very long climb, but it leaves a special satisfaction because it hardly ever gives you a break.
Once you reach Colle San Carlo, though, the effort quickly fades into the background. The fresh air, silence, and surrounding forest create a unique atmosphere, especially in summer.
From here, you can continue to Lago d'Arpy or turn it into a loop. The descent to La Thuile is enjoyable and lets you reach Pré-Saint-Didier before returning to Morgex. It's an option that adds variety and avoids retracing the same road.
But before heading back, it's worth stopping for a moment: from the pass, the view opens up over the Mont Blanc massif and the Courmayeur valley. A sight that makes every metre of climbing worthwhile.
