UTMB CCC 2026 Guide: Courmayeur, Champex, Chamonix

What makes CCC hard is the mix of rhythm and attrition. The course looks more runnable than UTMB or TDS, which makes it easy to go out too fast, especially with the energy of the Courmayeur start. But the accumulated climbing, the total duration and the final return toward Chamonix are more than enough to punish an aggressive plan. Runners who do well are usually the ones willing to stay controlled early so they can still push later on.

Preparation therefore needs a strong aerobic base without ignoring uphill efficiency. Long hilly runs, controlled tempo work on tired legs and repeated downhill practice all pay off. You also need to rehearse eating while moving, because on a 100 km mountain ultra your pacing quality is directly linked to how early you fuel, how consistently you drink and how little unnecessary rhythm change you create.

A common CCC mistake is treating it like a fast long trail race. In reality it is a mountain ultra with all the associated constraints: weather, possible darkness depending on your pace, mandatory kit, time on feet and decision fatigue. A good prep includes concrete rehearsals: validated shoes, a fully loaded pack, poles if you plan to use them, a clear carbohydrate strategy and a fallback plan if the legs or stomach turn against you.

The logistics add a very real layer of complexity. You start in Italy, pass through Switzerland and finish in France, all during one of the busiest race weeks in the Alps. You need to decide where to stay, how to reach Courmayeur, how you will recover in Chamonix and what happens with companions or luggage. Even though the distance is shorter than UTMB, the same transport and accommodation mistakes can damage the experience before the first climb.

The smart way to handle CCC is to centralise the key information and turn it into an executable plan. The TrailCompanion race page gives you the race basics; the Prep then helps you organise gear, travel, nutrition and race-week actions. That is especially useful for CCC, where the margin for error feels small precisely because the format appears simpler than it really is.

The first logistics decision is your alpine gateway. Geneva is still the easiest airport option for many runners, after which you need to choose between rental car, valley transfer and the final move to Courmayeur through the Mont Blanc tunnel. If you travel by rail, think in two legs as well: getting into the valley, then solving the final segment to the Italian start.

The real CCC trap is not the outward journey but the finish-side recovery. You end in Chamonix, usually exhausted, while your car or accommodation may be elsewhere. That is why you should decide early whether you are sleeping in Chamonix, sleeping in Courmayeur or delaying the return until the next day. The clearer that decision is, the less the finish line turns into a logistical tax.

Staying in Chamonix is usually the most robust option if you want to simplify bib pickup, finish recovery and the broader UTMB-week atmosphere. The downside is price and scarcity. Les Houches, Argentière, Servoz and Sallanches can all work well as long as your transfer to Courmayeur is solved before the week begins.

Sleeping in Courmayeur makes sense if your main priority is a calm start morning. The trade-off is that post-race recovery becomes more complicated once you finish in Chamonix. For many solo runners, the best compromise is a French-side base with a tightly planned transfer to Courmayeur. That is exactly the kind of decision TrailCompanion helps turn into a concrete checklist.

If you prepare CCC with the seriousness of a complete ultra, it becomes a very coherent and motivating target. If you underestimate it because it is "only" 100 km, you may find yourself chasing time, energy and solutions halfway through. That is the real objective: arrive at the start with the strategy already decided, not improvised.