Four Of Trail Running’s Biggest Names Are Missing From UTMB 2026. Here Is Why.
Kilian Jornet, Jim Walmsley, Tom Evans and Katie Schide are all out of UTMB 2026. Here is what happened and how it reshapes the race.
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UTMB Is Making Runners Use Red Headlamps Through One Section This Year. Wildlife Is The Reason
UTMB 2026 introduces a mandatory red headlamp section through the Reserve des Contamines-Montjoie. Here is why, plus every other new rule you need to know.
Every runner heading to the start line of UTMB 2026 this Friday will be carrying a piece of kit they did not need before.
The rule is simple.
Two headlamps are mandatory, as they always have been, but for 2026 one of them must have a red-light mode, and inside the Réserve naturelle des Contamines-Montjoie that is the setting runners are required to use.
UTMB has cited the reserve’s nocturnal wildlife as the reason.
That single line hides a much larger conversation that has been building in Chamonix all summer.
What the rule actually says
The Réserve naturelle des Contamines-Montjoie sits on the French side of the Mont-Blanc massif and is one of the highest-altitude nature reserves in the Alps.
UTMB’s official race page for the 100-mile event lists the change under mandatory equipment: “one of your two headlamps must have a red-light mode.”
Runners are expected to switch to red light for the full duration of their transit through the reserve, which the flagship UTMB race enters within the first 40 kilometres from Chamonix.
The rule applies to the UTMB (100 miles), the CCC (100K) and the TDS, all three of which cross the reserve at some point.
Why red light matters for wildlife
White headlamp light disrupts nocturnal animals far more than red light does. Most mammals and birds cannot see red wavelengths well, so a red beam registers as much dimmer than a white one of the same brightness.
For the reserve, that matters. The area hosts ibex, chamois, marmots, ptarmigan and several bat species, all of which are active at night during summer.
Ten thousand runners passing through with white headlamps over 48 hours is not the same as one hiker with a torch. The cumulative light pollution is what UTMB is trying to reduce.
This is not the only change for 2026
The red headlamp rule is the most visible new requirement, but it is one of several.
Doping controls have doubled
UTMB has doubled the number of doping controls for race week, and for the first time those controls will extend to age-group entrants rather than only the elite fields.
The move follows a season in which the sport has been repeatedly asked whether its non-elite categories are subject to the same standards as its podium contenders.
For most amateur runners, the practical takeaway is simple. Any therapeutic use exemption should be filed and any supplement should be checked, because the tests are no longer limited to the front of the race.
The course has been reworked between Chamonix and Les Houches
The opening section from Chamonix to Les Houches has been reworked for 2026, which is why the published distance shifts slightly from previous editions.
For most runners the change is cosmetic.
For those with detailed split targets from previous years it matters, because the first 15 kilometres will not match old pace charts.
The vendor expo has been pulled back to Place du Mont-Blanc
François-Xavier Laffin, the new mayor of Chamonix who took office in March, has spent the summer laying out what he wants changed about UTMB week.
One of his interventions has already landed.
The vendor expo is confined to Place du Mont-Blanc from this year onwards, a smaller footprint than the sprawl of previous editions.
Laffin has also publicly called for fewer competitors crossing protected ground at night and a limit on how many supporters travel with each runner.
Neither has been formalised for 2026, but both are pressure points for the 2027 edition.
What this means if you are running
Two practical points before Friday.
Check your headlamps now. Most modern trail headlamps include a red mode, but not all of them make it easy to switch to under fatigue, and a fumbled toggle at 2am on a technical descent is not a memory anyone wants.
Practice the switch in training. Turn a red beam on and off in the dark, on rough ground, wearing gloves.
If your primary headlamp does not have red mode, either buy a second one that does or move a compliant lamp into the primary slot before Friday.
The best headlamps for runners guide has the models that meet the requirement and hold up to a full alpine night.
What this means if you are watching
You are watching the sport quietly shift into a new phase, one that trades the raw growth of the last decade for a tighter footprint on the terrain it races across.
The doping controls extending to age-group entrants is the more consequential rule change.
It signals that UTMB now sees itself as accountable for the full field, not just the elites the cameras follow.
The red headlamp rule is smaller, but it is the one that reveals the direction of travel.
Ultra-races have crossed protected land for years without significant restrictions, and that free pass is ending.
The wider picture
Chamonix hosts one of the busiest race weeks in world sport.
Ten thousand runners, roughly 60 per cent of them travelling from outside France, plus crews, plus supporters, plus media, plus a vendor village.
What the valley can absorb is now the animating question of every rule change UTMB makes. Speaking to L’Équipe over the summer, Laffin framed it as a question of what the mountains can carry, and what the town can carry.
The red headlamp rule is the answer nobody would have written down a decade ago, and it is the answer that will define how this race looks in a decade’s time.
Expect more of it.
The mandatory kit list, the doping regime, the vendor footprint and the night-crossing rules are all now in play, and every one of them will keep tightening.
That is the trade-off UTMB has accepted to keep racing where it races.
The alternative is to move the course, and nobody in Chamonix wants that.
For a broader take on how European ultra events are evolving under similar pressure, 10 European ultra-running events you cannot miss walks through the calendar and what each race is trying to protect.
The 100-mile UTMB starts on Friday 28 August at 17:45 CEST from Chamonix. Bring the red headlamp.
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