Marathon du Mont-Blanc 2027

24.06 – 27.06.2027Chamonix (France)Registration opens on 20.11.2026

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7 courses · 3.8–88 km2.4–54.7 mi · up to 6’200 m D+up to 20’341 ft D+

At a glance

Marathon du Mont-Blanc 2027 takes place from Thursday 24 to Sunday 27 June 2027 in Chamonix (Haute-Savoie, France). 7 courses from 3.8 to 88 km.

Longest course: 90 Km du Mont-Blanc, 88 km with 6’200 m D+ (70 m per km: very steep terrain). It has 15 aid stations and 8 cutoffs. Terrain: 78% trail, including 53 km of mountain trail (T2); 16% forest track and 6% road. Terrain data: © OpenStreetMap contributors.

Registration is not open yet. On Kliva, plan your pacing and nutrition for free, then send the plan to your watch.

A trail running event organized by the Club des Sports de Chamonix, with 10,000 runners participating in one of the 8 races on the trails around Chamonix, in the Mont Blanc massif.

From the organiser

7 courses

3.8km2.4mi
1’000 m D+3’281 ft D+
57 m D-187 ft D-
avg 26%
Km Vertical
25.06.
No index
GPX
7km4.3mi
650 m D+2’133 ft D+
627 m D-2’057 ft D-
avg 9%
Young Race Marathon U18
26.06.
No index
GPX
10km6.2mi
325 m D+1’066 ft D+
331 m D-1’086 ft D-
avg 3%
10 Km du Mont-Blanc
26.06.
No index
GPX
13km8.1mi
1’200 m D+3’937 ft D+
1’274 m D-4’180 ft D-
avg 9%
Young Race Marathon U20
26.06.
GPX
23km14.3mi
1’680 m D+5’512 ft D+
633 m D-2’077 ft D-
avg 7%
23 Km du Mont-Blanc
26.06.
GPX
42km26.1mi
2’540 m D+8’333 ft D+
2’447 m D-8’028 ft D-
avg 6%
42 Km du Mont-Blanc
27.06.
GPX
88km54.7mi
6’200 m D+20’341 ft D+
6’046 m D-19’836 ft D-
avg 7%
90 Km du Mont-Blanc
15 aid stations
GPX

Course analysis

88 km54.7 mi6’200 m D+20’341 ft D+

150effort kmⓘ88 km on the map · feels like 150 km54.7 mi on the map · feels like 150 km

D+: 6’200 m20’341 ft
D−: 6’046 m19’836 ft
Max alt.: 2’473 m8’114 ft
Steepest: 21%

Segments

Elevation profile: 90 Km du Mont-Blanc

1’035 m – 2’473 m3’396 ft – 8’114 ft

Terrain

Aid station by aid station

Terrain, climb and cutoff between each aid station.

Place du triangle de l'amitié → Brévent km 0 → 10km 0 → 6.2
10 km6.2 mi · +1’485 m4’872 ft · −82 m269 ft
Brévent → Planpraz km 10 → 12.6km 6.2 → 7.8
2.6 km1.6 mi · +45 m148 ft · −430 m1’411 ft
Planpraz → Flégère km 12.6 → 17.9km 7.8 → 11.1
5.3 km3.3 mi · +121 m397 ft · −331 m1’086 ft · Cutoff Sat 09:35
Flégère → Tete aux vents km 17.9 → 21.5km 11.1 → 13.4
3.6 km2.2 mi · +314 m1’030 ft · −38 m125 ft
Tete aux vents → Buet km 21.5 → 28.3km 13.4 → 17.6
6.8 km4.2 mi · +97 m318 ft · −807 m2’648 ft
Buet → La villaz km 28.3 → 35km 17.6 → 21.7
6.6 km4.1 mi · +424 m1’391 ft · −488 m1’601 ft · Cutoff Sat 13:05
La villaz → Emosson km 35 → 40.5km 21.7 → 25.1
5.5 km3.4 mi · +745 m2’444 ft · −178 m584 ft · Cutoff Sat 15:05
Emosson → Le Chatelard km 40.5 → 44.5km 25.1 → 27.7
4.1 km2.5 mi · +151 m495 ft · −809 m2’654 ft
Le Chatelard → Catogne km 44.5 → 50.6km 27.7 → 31.5
6.1 km3.8 mi · +949 m3’114 ft · −7 m23 ft
Catogne → Col des Posettes km 50.6 → 54.8km 31.5 → 34.1
4.2 km2.6 mi · +205 m673 ft · −361 m1’184 ft
Col des Posettes → Le Tour 90 km 54.8 → 59.8km 34.1 → 37.2
5 km3.1 mi · +71 m233 ft · −635 m2’083 ft · Cutoff Sat 20:20
Le Tour 90 → Les Bois km 59.8 → 69.6km 37.2 → 43.2
9.8 km6.1 mi · +346 m1’135 ft · −541 m1’775 ft · Cutoff Sat 22:20
Les Bois → Montenvers 90/duo km 69.6 → 74km 43.2 → 46
4.4 km2.7 mi · +671 m2’201 ft · −6 m20 ft · Cutoff Sun 00:50
Montenvers 90/duo → Le Signal 90km/duo km 74 → 76.5km 46 → 47.6
2.6 km1.6 mi · +273 m896 ft · −130 m427 ft
Le Signal 90km/duo → Plan de l'Aiguille km 76.5 → 80.9km 47.6 → 50.3
4.4 km2.7 mi · +144 m472 ft · −264 m866 ft · Cutoff Sun 02:50
Plan de l'Aiguille → Finish km 80.9 → 88km 50.3 → 54.7
7.1 km4.4 mi · +6 m20 ft · −939 m3’081 ft

Elevation figures are measured by Kliva on the course trace. Cutoffs are the organiser's.

Race plan

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Pacing, aid stations and fueling timed to your effort on Marathon du Mont-Blanc, in one roadbook.

Includes this race's official aid stations and cutoff times.

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