4.6
(5)
219
riders
Morgex – Colle San Carlo – La Thuile – Morgex
02:04
30.6km
1,060m
Road cycling
From the valley floor to high-altitude woods in just a few kilometers: the Colle San Carlo is a direct, steady climb without too many compromises, one of those that immediately set the pace.
Start from Morgex, among vineyards and open fields at the foot of Mont Blanc, and take the road to Lago d’Arpy. The climb is constant from the beginning, with sustained gradients and sections that leave little room for recovery, immersed in an increasingly alpine environment. Gaining altitude, the woods become denser and traffic decreases, making the ascent continuous and focused.
At the pass, the landscape opens up: from here you begin a long descent towards La Thuile, a border town on the Little St Bernard Pass road. The return to Morgex is via Pré-Saint-Didier, known for its thermal baths, following the valley floor with a smoother section that closes the loop.
Last updated: May 20, 2026
Waypoints
Start point
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137 m
Village of Morgex
Highlight • Settlement
Translated by Google •
Tip by
10.7 km
Colle San Carlo
Highlight • Mountain Pass
Challenging and relentless climb, from a good military road it ascends with very regular gradients that allow, once you find your rhythm, to go steadily to the top without too much trouble.
From Pré-Saint-Didier:
Decidedly easy climb to La Thuile (gradients around 4-5%), from there the climb becomes challenging with severe gradients (although not like those of the more famous Morgex side).
Be careful, in summer, of traffic (on the descent, use great caution on both sides) and of the south-facing exposure which makes it very hot in the afternoon.
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Tip by
16.8 km
La Thuile
Highlight • Settlement
Translated by Google •
Tip by
26.3 km
Pré-Saint-Didier
Highlight • Settlement
Translated by Google •
Tip by
30.6 km
End point
Way Types & Surfaces
Way Types
19.2 km
10.3 km
1.01 km
Surfaces
30.4 km
126 m
< 100 m
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Elevation
Highest point (1,950 m)
Lowest point (920 m)
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Weather
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Today
Wednesday 15 July
24°C
13°C
85 %
Additional weather tips
Max wind speed: 12.0 km/h
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This route was planned by komoot.
Comments
April 9, 2026
From the valley floor to high-altitude woods in just a few kilometers: the Colle San Carlo is a direct, steady climb without too many compromises, one of those that immediately set the pace.
Start from Morgex, among vineyards and open fields at the foot of Mont Blanc, and take the road to Lago d’Arpy
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